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212-055 - Sun Certified Programmer for the Java 2 Platform.SE 5.0 - Dump Information

Vendor : SUN
Exam Code : 212-055
Exam Name : Sun Certified Programmer for the Java 2 Platform.SE 5.0
Questions and Answers : 581 Q & A
Updated On : December 13, 2018
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212-055 Questions and Answers

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212-055 Sun Certified Programmer for the Java 2 Platform.SE 5.0

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212-055 exam Dumps Source : Sun Certified Programmer for the Java 2 Platform.SE 5.0

Test Code : 212-055
Test Name : Sun Certified Programmer for the Java 2 Platform.SE 5.0
Vendor Name : SUN
Q&A : 581 Real Questions

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After 30 years in Lowell, solar editor calls it a career | killexams.com Real Questions and Pass4sure dumps

Sun Editor Jim Campanini chats with colleagues on Friday after announcing his departure in two weeks after a 43-year career that includes three decades at sun Editor Jim Campanini chats with colleagues on Friday after asserting his departure in two weeks after a forty three-12 months career that contains three a long time on the Lowell newspaper. solar/chris lisinski

solar body of workers photographs may also be ordered by using touring our SmugMug website.

LOWELL -- James H. Campanini, who as editor piloted The solar through one of the vital turbulent periods within the newspaper trade whereas overseeing its emergence as an impressive drive on social media, introduced Friday he will go away on Nov. 30.

Campanini's future on the sun has been the field of speculation for months.

The time has arrived, however, to "cease relocating the goal posts" on a departure date, the sixty six-12 months-old veteran journalist pointed out Friday.

"First it turned into this past summer time, then the election, then the end of the yr," Campanini stated. "ultimately, Mary Lee (Harrington, his wife) pointed out it's time.

"suppose about it," he delivered. "In forty three years during this business I actually have certainly not had December off to benefit from the break season.

Sun Editor Jim Campanini looks over the newspaper’s website with digital producer Jendhamuni Sos on Friday. sun/chris lisinskiSun staff photos can be sun Editor Jim Campanini looks over the newspaper's web page with digital producer Jendhamuni Sos on Friday. solar/chris lisinski

sun staff photographs can also be ordered by way of visiting our SmugMug web site.

i am longing for having a standard breakfast and happening walks with Pigeon," regarding Mike Pigeon, his dear friend, "wine butler," and retired solar photographer.

A resident of Lowell's Belvidere area, Campanini joined The sun in 1988 as assistant managing editor. He soon worked his means up the newsroom company ladder to managing editor, govt news editor, news and operations supervisor and editorial web page editor.

He became named editor in 2004 to e book The sun's transformation into the digital age.

Campanini met with sun publisher Kevin Corrado early Friday morning, then announced his plans to newsroom body of workers.

Corrado said he'll miss Campanini's leadership and steady hand.

"I've simplest worked with Jim a bit over a yr, and in that time I've come to respect and respect him," Corrado observed. "to claim that ink ran in Jim's blood is an understatement. No remember what difficulty we had been dealing with, I knew I might count number on Jim to locate a way to present the story with integrity and in a fair and correct manner. Jim has earned this time to relish his family unit ... without needing to be anxious about lacking closing date. i will miss him."

Following his graduation from the tuition of Rhode Island, Campanini worked for a number of newspapers, including the brand new London (Conn.) Day, Salem night news and Patriot Ledger of Quincy, constantly for roughly half-dozen years each. He figured to continue the fashion in Lowell, but something took place.

"The americans I've met during this city and region are spectacular, and their energy to enrich the vicinity is contagious," he noted. "The sun become instrumental in making the area a much better place to reside and work. i was happy to call this city not handiest a spot where I work, but additionally my domestic."

but it surely hasn't been convenient. The 24-hour information cycle has been a video game-changer for community newspapers. When Campanini took over, the newspaper had a couple of variations, greater than four dozen full-time employees and pretty much two dozen half-timers.

The roster is rarely as deep nowadays, but those that put out The sun seven days per week, twelve months a year are expert, dogged and dedicated, Campanini mentioned.

A proud Rhode Island native who not ever misses a chance to discuss his adolescence starting to be up in windfall, Campanini graduated from URI in 1974 and, later in his profession, a distinct desktop-assisted reporting path on the venerable institution of Missouri.

with his newfound talents one among his first tasks became tracing essentially the most prevalent pet names within the vicinity. The undertaking failed to topple a corrupt flesh presser, however Campanini showed what may also be carried out with spreadsheets and records. soon the staff became expert to increase their research potential with the equal tools.

He would later became a tireless suggest for the public's appropriate to know, perpetually prodding newshounds to file state and federal freedom of information requests to pry from city and city halls files public officers were loathe to liberate. in consequence, The solar has won a couple of New England Newspaper and Press affiliation awards given to newspapers that give protection to the primary change and the public's correct to grasp.

A journalist who got his delivery writing 10 experiences per week for a weekly, and later activities, Campanini has a lot of titles under his belt. In 1976, Campanini gained most efficient sports story and most appropriate column from the then-New England Press association and The Suburban Newspapers of the us. 

at the solar, he is received five New England first-region awards for editorial writing and complete runner-up 3 times. In 2008, he grew to become the primary journalist within the solar's then 130-12 months background to win the distinguished Allan B. Rogers Award for writing what become judged by the Neiman groundwork as the top-quality native editorial in New England.

A yr later, in 2009, Campanini also broke new floor when he obtained the american Quill, the maximum honor for lifetime achievements in New England journalism. He was the first journalist from The solar to obtain the Quill.

at the time, Campanini spoke of: "It capacity a great deal being honored through my friends. i'm deeply humbled to be in a gaggle of such achieved journalists who've performed so a good deal first rate for brand spanking new England newspapers and their communities."

another vital watershed experience in Campanini's life happened prior this fall, when he attended a family reunion in Gatlinburg, Tenn.

within the coronary heart of the Smoky Mountains, he did some soul-looking.

"My spouse has been retired for four years and so has my brother," he said, relating to his identical twin brother, John. "In retirement, he's taken 4 strokes off his golf video game. i might like the chance to are attempting and catch up."

Campanini plans to do exactly that, in addition to pursuing his passion: the study of wine. when you consider that 2014, he has traveled to wine regions in France, Italy, new york State, California, Oregon, and Washington State, the place he has met dozens of vintners and producers. His experiences were chronicled in the universal "Wine beginner" column he writes weekly for The sun and on-line. He plans to continue writing the column.

In February, Campanini completed a two-yr Wine scholar Guild examination program in Italian wines and obtained his certification with honors. he is additionally working towards his French wine certification.

last 12 months, Campanini launched a series of two-hour wine seminars on the Nesmith residence through Middlesex community faculty's grownup continuing training application. the fall collection was a sellout and it'll be revived in the spring of 2019.


profession tips for a solar Certification | killexams.com Real Questions and Pass4sure dumps

most likely most useful common for creating the Java programming platform, sun Microsystems provided a collection of certification courses and checks for assistance technology (IT) people to display their technical capabilities the usage of solar utility and systems. some of the certifications provided consist of the solar licensed Java Developer, solar licensed enterprise Architect, sun certified cellular utility Developer and sun certified net part Developer. solar Microsystems became purchased with the aid of Oracle in 2010, and while those certifications are nevertheless legitimate for individuals who earned them in 2010 or prior, those earning certification from that date ahead earned Oracle-branded certifications.

all of the older sun certifications have correlating alternate options from Oracle, and Oracle additionally offers upgrade paths for these preserving solar certifications. as an example, as of may additionally 2016, Oracle offered 17 certification options related to Java. Oracle's Java certifications are provided in three classes, Java SE, Java EE and Java ME, based off of the platform used. one of the certifications alternate options include Oracle licensed knowledgeable Java Programmer, Oracle licensed master Java commercial enterprise Architect, Oracle certified knowledgeable Java internet part Developer and Oracle licensed knowledgeable Java cell software Developer. feasible profession choices for these with solar or Oracle certification include work as Java technologists, server administrators or hardware engineers.

Java Technologist Server Administrator computing device Hardware Engineer tutorial requirementsBachelor's degree Bachelor's degree Bachelor's diploma Job competencies competencies of significant applied sciences, adaptable, aspect-oriented, good difficulty-fixing skill and respectable communique knowledge Familiarity with altering applied sciences, good conversation knowledge, robust consideration to detail and ability to multitask first rate verbal exchange competencies, mighty knowing of crucial technologies, respectable problem-fixing means and creativity Median profits (2015) $67,925 (all java builders) $77,810 (network and desktop systems directors) $111,730 Job Outlook (2014-2024) 17% (all utility builders) eight% 3%

supply: PayScale.com, U.S. Bureau of Labor information

Java Technologist

one of latest most in-demand programming abilities is the capacity to increase Java purposes. Java, the programming language and assisting platform created through solar Microsystems for established compatibility among operating programs, is used for a broadly distinctive range of goal environments, from computing device PCs and networks to cellphones. internet-based mostly Java applications are usually smaller assemblies of code transmitted over the information superhighway with significant server-based purposes.

The large applicability of Java ability that an outstanding number of employers enormously value gurus with Java potential, whether or not they work with a large building crew or as lone programmers for a particular task. there is loads of edition within the business, with the U.S. Bureau of Labor information (BLS) expecting a decline in employment boom of 8% for computer programmers and a boom of 17% for software builders between 2014 and 2024. Working as a programmer or utility developer usually requires a bachelor's diploma concerning computing device science, expertise of Java certification shows employers you are prevalent with the language. in line with PayScale.com, java software builders and programmers earned a median income of $67,925 and those with the solar licensed Java Programmer credential earned between $49,218 and $108,129.

Server Administrator

Server administrators configure and install servers along side local area networks (LAN) and vast area networks (WAN). in addition to protecting a given community, server administrators need to make sure that the network reliably meets the needs of users, no matter if in a company, tutorial, governmental or other ambiance. They might also survey utilization and make applicable improvements in line with colleagues' wants. changes to the server and community are commonly made all through a time that least interferes with people' tasks, which capability that working all the way through nights, weekends or on name is commonplace. In an ambiance requiring 24/7 uptime, it's critical to be prevalent with dissimilar redundancy and scorching-swap applied sciences comparable to RAIDs.

network and laptop programs directors generally need a bachelor's diploma in laptop science, although a linked certificate might also suffice for some jobs. The BLS expects this box to journey as quick as typical growth of eight% between 2014 and 2024. The median pay for a community and laptop administrator in may also 2015 turned into $seventy seven,810.

computer Hardware Engineer

laptop hardware engineers manipulate, strengthen and keep the hardware components that underlie up to date IT techniques. responsibilities encompass installation, upgrading features and aid. This career continually requires a computer engineering, electrical engineering or laptop science bachelor's degree. because this profession requires an knowing of computing device software, earning solar certification may well be beneficial.

The job outlook for this place may be quite languid all through the 2014-2024 decade, as a result of an expanded center of attention on utility as opposed to hardware and increased outsourcing; besides the fact that children, engineers with computing device application event and excessive-stage levels may still have stronger possibilities of finding jobs. The expected increase over the decade is at a sluggish cost of three%. in keeping with may additionally 2015 BLS figures, most laptop hardware engineers earned between $65,570 and $167,100 a 12 months, with the median pay at $111,730.


Troy set for solar Belt convention healthy with Texas State | killexams.com Real Questions and Pass4sure dumps

TROY, AL (WSFA) - The Troy Trojans enter their Saturday showdown with Texas State with much more than just a win on Senior Day on the line.

With Troy’s play the final three seasons, the crew’s put itself in position to contend for a convention championship each and every of these years.

completing 10-3 two years ago, the Trojans saw their first AP exact 25 rating as a D-I school, and then surpasses those limits final season, by way of claiming a element of the sun Belt conference title, it’s first conference title considering the fact that 2010. within the 2017 season, the Trojans also set a new school mark for wins in a season as a D-I school, surpassing the 2016 season of 10 wins with eleven.

And now this yr, Troy may very well discover itself setting college information once again.

because it stands, the Trojans take a seat atop the East division of the sun Belt convention with an 8-2 general list and 6-0 in solar Belt play. This previous weekend the Trojans slayed fellow huge Georgia Southern 35-21.

Now the Trojans flip their heads to incoming opponent Texas State who look to invade Veterans Memorial Stadium and upset the Trojans in a extremely massive approach.

it will be an upset of epic proportion as the Bobcats presently sit down at 3-7 on the season and simply 1-5 in the solar Belt conference. Their numbers on the street aren’t amazing, and the numbers they allow are nothing to be pleased with either.

In five road games this season, Texas State permits on normal 30.four points per online game and a total of 375 yard per game on the road. against a dashing attack within the Trojans who rank in opposition t the correct in the conference, Texas State will deserve to make some changes as they permit a whopping 185.eight yards per online game on the floor in opposing stadiums.

The Trojans then again seem to have the higher hand in all offensive categories. At home, Neal Brown’s excessive-powered offense is available in averaging 37.4 aspects per online game in Veterans Memorial Stadium and hasn’t misplaced since its season-opener to Boise State.

The Troy rushing attack averages 229.6 yards per online game at domestic with the high factor coming at 340 dashing yards towards Georgia State on Oct. 4.

So with all the numbers tipping in choose of the Trojans, why is head train Neal Brown nonetheless doubtful of a certain win Saturday?

“We lost to a Liberty crew that we likely shouldn’t have,” he stated.

If there have been to be any blemish upon a Troy season that does end in a trip to the solar Belt convention title game or profitable it, it’s the Oct. 13 Liberty game during which Troy lost 22-16. It turned into Sawyer Smith’s first delivery as Troy’s quarterback and Troy’s first video game with out beginning quarterback Kaleb Barker who's lost for the season due to an ACL harm.

That’s the one question mark on a superb season, and train Brown isn’t guaranteeing a win for that single motive, if nothing else.

And still, Troy controls their own destiny. Brown’s made the assessment to Troy’s ultimate four games of the usual season to boxing matches.

to this point, the primary two rounds have long past to Troy.

“We’re within the third circular of this heavyweight fight we’ve been in right here in the month of November,” Brown mentioned.

He mentioned not simplest are they in “live on and boost” mode, but Brown mentioned his Trojans are additionally enjoying to prove that they’re no longer pretenders.

It starts with Texas State Saturday, and the Trojans have an exquisite good corps of fellows leading them.

B.J. Smith is arguably at the forefront of the corps. He leads the solar Belt convention with 12 touchdowns and is averaging 94.6 yard per online game rushing. He’s 54 yards shy of becoming the 10th Trojan rusher to reach 1,000 yards in a season and against a Texas State dashing defense that struggles, Smith may still very smartly accomplish that feat.

on the receiving position, the Trojans possess possibly the top of the line receiver within the conference within the sort of Damion Willis. Willis - a familiar ball magnet - catches anything thrown in his path and leads the convention with eight receiving touchdowns. Willis sits at fifth in total receptions at forty three, and leads the league with 775 receiving yards.

The Trojan protection touts a strong front seven neighborhood able to getting after the quarterback. The problem Saturday lies in stopping twin-danger quarterback Willie Jones III for the Bobcats.

Jones leads the Bobcats in passing yards and rushing yards. He’s an authorized risk with his legs as he has over 400 speeding yards on the season.

while Troy has racked up 25 sacks in convention play, they’ll need to do exactly as tons containing Saturday to supply the secondary a chance to make performs on the Texas State receivers.

All-in-all, it received’t be effortless, but should Troy increase previous Texas State on Senior Day, its subsequent online game - the season finale towards App State - may be for all the marbles within the East Division.

Troy and Texas State are set to kick issues off at 2:30 p.m. in Veterans Memorial Stadium.

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212-055 Sun Certified Programmer for the Java 2 Platform.SE 5.0

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212-055 exam Dumps Source : Sun Certified Programmer for the Java 2 Platform.SE 5.0

Test Code : 212-055
Test Name : Sun Certified Programmer for the Java 2 Platform.SE 5.0
Vendor Name : SUN
Q&A : 581 Real Questions

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Sun Certified Programmer for the Java 2 Platform.SE 5.0

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Anatomy of a Java Finalizer | killexams.com real questions and Pass4sure dumps

A couple of patterns that could cause Java heap exhaustion were identified from years of research at IBM. One interesting scenario was observed when Java applications generated an excessive amount of finalizable objects whose classes had non-trivial Java finalizers.

What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the opposite of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can be used to perform postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an object is no longer needed and those resources have to be released for other objects. You don't need any argument or any return value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's take a closer look at finalize() method of java.lang.Object that provides an instance method, finalize() for finalization:

protected void finalize() throws Throwable

When a Java object is no longer needed, the space occupied by the object is supposed to be recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not found in most structural programming languages like C. If an instance of a class implements the finalize() method, its space cannot be recycled by the garbage collector in a timely fashion. Worst case, it may not be recycled at all.

Any instances of classes that implement the finalize() method are often called finalizable objects. They will not be immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() method of the objects. Only after successful completion of the finalize() method will an object be handed over for Java garbage collection to get its space reclaimed by "future" garbage collection. I did not say "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds like it has some overhead? You got it. We need several shots to get the space recycled.

Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot keep up with the rate at which higher priority threads cause finalizable objects to be queued, the finalizer queue will keep growing and cause the Java heap to fill up. Eventually the Java heap will get exhausted and a java.lang.OutOfMemoryError will be thrown.

A Java Virtual Machine will never invoke the finalize() method more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the object is halted.

You are free to do virtually anything in the finalize() method of your class. When you do that, please do not expect the memory space occupied by each and every object to be reclaimed by the Java garbage collector when the object is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() method will complete the execution in timely manner. Worst case, it may not be even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that have a finalize() method are garbage collected. That's a potential hazard from a memory management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the object in the next garbage collection cycle.

If you want to run cleanup tasks on objects, consider finalizers as a last resort and implement your own cleanup method, which will be more predictable. It's very risky to rely on finalizers for postmortem cleanup tasks, especially if your finalizable objects have references to native resources.

Hands-on Experience with Java FinalizerWe can easily simulate this scenario with a couple of test applications and take a look at dumps and traces to see what's happening inside of the Java heap and threads for hands-on experience.

Let's build a couple of Java classes to recreate typical scenarios.

In ObjectWYieldFinalizer, we can implement the method finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can be downloaded here.)

The Thread.yield() method prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will pause its execution.

In ObjectWExceptionFinalizer, the finalizer() method immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the object finalization won't be completed because of the exception and there's no second chance to run the finalize() method (see Listing 2).

In ObjectWEmptyFinalizer, we don't implement any code in the finalize() method (see Listing 3). ObjectWOFinalizer doesn't have any finalize() method (see Listing 4).

Let's run each of the classes to see what happens. Sun's Java Virtual Machine (JVM) can be used with the following options for the class TestObjectWYieldFinalizer.

/sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt

It looks very complicated. Why do we need those command-line options? Well, without those options, we only get a little information about Java garbage collection activities like this:

[Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]

We only get a type of garbage collection (Full GC), total Java heap usage before garbage collection (50,815K), total Java heap usage after garbage collection (45,644K), a high watermark of total Java heap (50,816K), and time spent in the garbage collection (0.2276940 secs).

High watermark is the size of the current Java heap. The Java heap can expand its size up to a maximum size or contract to manage Java heap effectively.

The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.

We can see Java heap usage and the time (in seconds) spent in Java garbage collection of each new generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:

[GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]

In tenured generation, Java heap usage was 43,897KB before this Java garbage collection. Java heap usage reached 47,295KB after Java garbage collection; 47296K is the size of the high watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately we do not see the maximum size of each generation with the -XX:+PrintGCDetails option alone.

With -XX:+PrintGCTimeStamps, we can get a timestamp for each garbage collection like this:

1.393: [GC 1002K->106K(5056K), 0.0001036 secs]

This garbage collection started 1.393 seconds after the JVM started.

The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).

We can even see the address range of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.

The last option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java heap to a file when an allocation from the Java heap cannot be satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.

If you want to experiment with IBM's Java Virtual Machine, all you need is a -verbosegc command-line option. You do not need any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.

Let's take a look at what happened to the class while we talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:

Exception in the thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)

"java.lang.OutOfMemoryError: Java heap space." That means we got Java heap space exhaustion. The JVM could not allocate any more Java heap while running the method java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, we did not write Finalizer.java. That's a part of the JVM. We can also check verbosegc.txt to which we redirected the garbage collection trace (see Listing 6).

About 3.711 seconds after the JVM started, we got java.lang.OutOfMemoryError. The Java heap dump is written to pid124.hprof.

Analysis of Java Garbage Collection TracesWe can use a tool to analyze this trace. The IBM Pattern Modeling and Analysis Tool for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I have implemented patented algorithms to predict future failures related to Java heap exhaustion in this tool. Please refer to United States Patent No. 7,475,214 if you are interested in the algorithms. Although we don't need these algorithms to investigate simple problem like this, you might be able to find situations where you could get some insight from fortune tellers. We can get a copy of the tool here.

PMAT parses verbose garbage collection (GC) trace, analyzes Java heap usage, and recommends possible solutions based on pattern modeling of Java heap usage.

The following features are included:

  • GC analysis
  • GC table view
  • Allocation failure summary
  • GC usage summary
  • GC duration summary
  • GC graph view
  • GC pattern analysis
  • Zoom in/out/selection/center of chart view
  • The tool can also parse Sun's Java garbage collector traces, including the following:

  • Serial collector
  • Throughput/parallel collector
  • Concurrent collector
  • Incremental/train collector
  • We can start version 3.2 of the tool with a jar file in the download package. (V3.2 was the latest version when this article was written.)

    # /usr/java5/bin/java -Xmx200m -jar ga32.jar

    The tool provides a headless mode but let's bring up the graphical user interface mode for easy demonstration. We can click on the "N" icon to open Sun's trace file. We can click on "I" for IBM's trace file as seen in Figure 1.

    We can see in Figure 2 the analysis result and recommendation virtually instantly.


    Access MySQL Database With PHP | killexams.com real questions and Pass4sure dumps

    In-Depth

    Access MySQL Database With PHP

    Use the PHP extension for MySQL to access data from the MySQL database.

  • By Deepak Vohra
  • 06/20/2007
  • The MySQL database is the most commonly used open source relational database. It supports different data types in these categories: numeric, date and time, and string. The numeric data types include BIT, TINYINT, BOOL, BOOLEAN, INT, INTEGER, BIGINT, DOUBLE, FLOAT and DECIMAL. The date and time data types include DATE, DATETIME, TIMESTAMP and YEAR. The string data types include CHAR, VARCHAR, BINARY, ASCII, UNICODE, TEXT and BLOB. In this article, you will learn how you can access these data types with PHP scripting language — taking advantage of PHP 5's extension for the MySQL database.

    Install MySQL DatabaseTo install the MySQL database, you must first download the community edition of MySQL 5.0 database for Windows. There are three versions: Windows Essentials (x86), Windows (x86) ZIP/Setup.EXE and Without installer (unzip in C:\). To install the Without installer version, unzip the zip file to a directory. If you've downloaded the zip file, extract it to a directory. And, if you've downloaded the Windows (x86) ZIP/Setup.EXE version, extract the zip file to a directory. (See Resources.)

    Next, double-click on the Setup.exe application. You will activate the MySQL Server 5.0 Setup wizard. In the wizard, select the Setup Type (the default setting is Typical), and click on Install to install MySQL 5.0.

    In the Sign-Up frame, create a MySQL account, or select Skip Sign-Up. Select "Configure the MySQL Server now" and click on Finish. You will activate the MySQL Server Instance Configuration wizard. Set the configuration type to Detailed Configuration (the default setting).

    If you're not familiar with MySQL database, select the default settings in the subsequent frames. By default, server type is set at Developer Machine and database usage is set at Multifunctional Database. Choose the drive and directory for the InnoDB tablespace. In the concurrent connections frame, select the DDSS/OLAP setting. Next, select the Enable TCP/IP Networking and Enable Strict Mode settings and use the 3306 port. Select the Standard Character Set setting and the Install As Windows Service setting with MySQL as the service name.

    In the security options frame, you can specify a password for the root user (by default, the root user does not require a password). Next, uncheck Modify Security Settings and click on Execute to configure a MySQL Server instance. Finally, click on Finish.

    If you've downloaded the Windows Installer Package application, double-click on the mysql-essential-5.0.x-win32.exe file. You will activate the MySQL Server Startup wizard. Follow the same process as Setup.exe.

    After you've finished installing the MySQL database, log into the database with the MySQL command. In a command prompt window, specify this command:

    >mysql -u root

    The default user root will log in. A password is not required for the default user root:

    >mysql -u <username> -p <password>

    The MySQL command will display:

    mysql>

    To list the database instances in the MySQL database, specify this command:

    mysql>show databases

    By default, the test database will be listed. To use this database, specify this command:

    mysql>use test

    Install MySQL PHP ExtensionThe PHP extension for MySQL database is packaged with the PHP 5 download (see Resources). First, you need to activate the MySQL extension in the php.ini configuration file. Remove the ';' before this code line in the file:

    extension=php_mysql.dll

    Next, restart the Apache2 Web server.

    PHP also requires access to the MySQL client library. The libmysql.dll file is included with the PHP 5 distribution. Add libmysql.dll to the Windows System PATH variable. The libmysql.dll file will appear in the C:/PHP directory, which you added to the System PATH when you installed PHP 5.

    The MySQL extension provides various configuration directives for connecting with the database. The default connection parameters establish a connection with the MySQL database if a connection is not specified in a function that requires a connection resource and if a connection has not already been opened with the database.

    The PHP class library for MySQL has various functions to connect with the database, create database tables and retrieve database data.

    Create a MySQL Database TableNow it's time to create a table in the MySQL database using the PHP class library. Create a PHP script named createMySQLTable.php in the C:/Apache2/Apache2/htdocs directory. In the script, specify variables for username and password, and connect with the database using the mysql_connect() function. The username root does not require a password. Next, specify the server parameter of the mysql_connect() method as localhost:3306:

    $username='root'; $password=''; $connection = mysql_connect ('localhost:3306', $username, $password);

    If a connection is not established, output this error message using the mysql_error() function:

    if (!$connection) { $e = mysql_error($connection); echo "Error in connecting to MySQL Database.".$e;}

    You'll need to select the database in which a table will be created. Select the MySQL test database instance using the mysql_select_db() function:

    $selectdb=mysql_select_db('test');

    Next, specify a SQL statement to create a database table:

    $sql="CREATE TABLE Catalog (CatalogId VARCHAR(25) PRIMARY KEY, Journal VARCHAR(25), Publisher Varchar(25),Edition VARCHAR(25), Title Varchar(75), Author Varchar(25))";

    Run the SQL statement using the mysql_query() function. The connection resource that you created earlier will be used to run the SQL statement:

    $createtable=mysql_query ($sql, $connection );

    If a table is not created, output this error message:

    if (!$createtable) { $e = mysql_error($connection); echo "Error in creating Table.".$e; }

    Next, add data to the Catalog table. Create a SQL statement to add data to the database:

    $sql = "INSERT INTO Catalog VALUES('catalog1', 'Oracle Magazine', 'Oracle Publishing', 'July-August 2005', 'Tuning Undo Tablespace', 'Kimberly Floss')";

    Run the SQL statement using the mysql_query() function:

    $addrow=mysql_query ($sql, $connection );

    Similarly, add another table row. Use the createMySQLTable.php script shown in Listing 1. Run this script in Apache Web server with this URL: http://localhost/createMySQLTable.php. A MySQL table will display (Figure 1).

    Retrieve Data From MySQL DatabaseYou can retrieve data from the MySQL database using the PHP class library for MySQL. Create the retrieveMySQLData.php script in the C:/Apache2/Apache2/htdocs directory. In the script, create a connection with the MySQL database using the mysql_connect() function:

    $username='root'; $password=''; $connection = mysql_connect ('localhost:3306', $username, $password);

    Select the database from which data will be retrieved with the mysql_select_db() method:

    $selectdb=mysql_select_db('test');

    Next, specify the SELECT statement to query the database (The PHP class library for MySQL does not have the provision to bind variables as the PHP class library for Oracle does.):

    $sql = "SELECT * from CATALOG";

    Run the SQL query using the mysql_query() function:

    $result=mysql_query($sql , $connection);

    If the SQL query does not run, output this error message:

    if (!$result) { $e = mysql_error($connection); echo "Error in running SQL statement.".$e; }

    Use the mysql_num_rows() function to obtain the number of rows in the result resource:

    $nrows=mysql_num_rows($result);

    If the number of rows is greater than 0, create an HTML table to display the result data. Iterate over the result set using the mysql_fetch_array() method to obtain a row of data. To obtain an associative array for each row, set the result_type parameter to MYSQL_ASSOC:

    while ($row = mysql_fetch_array ($result, MYSQL_ASSOC)) { }

    Output the row data to an HTML table using associative dereferencing. For example, the Journal column value is obtained with $row['Journal']. The retrieveMySQLData.php script retrieves data from the MySQL database (Listing 2).

    Run the PHP script in Apache2 server with this URL: http://localhost/retrieveMySQLData.php. HTML data will appear with data obtained from the MySQL database (Figure 2).

    Now you know how to use the PHP extension for MySQL to access data from the MySQL database. You can also use the PHP Data Objects (PDO) extension and the MySQL PDO driver to access MySQL with PHP .

    About the AuthorDeepak Vohra is a Web developer, a Sun-certified Java programmer and a Sun-certified Web component developer. You can reach him at dvohra09@yahoo.com.

    About the Author

    Deepak Vohra, a Sun-certified Java programmer and Sun-certified Web component developer, has published numerous articles in industry publications and journals. Deepak is the author of the book "Ruby on Rails for PHP and Java Developers."


    Comparing the Technologies | killexams.com real questions and Pass4sure dumps

    Language and Runtime Support

    Java. Developed in 1995 by Sun. All code is compiled into bytecode and interpreted by a virtual machine (JVM). May also be selectively JIT compiled, depending on the JVM, or fully natively compiled with ancillary products (such as JOVE). Can run on any platform that supports a JVM. IBM supports v1.3 of the J2SE SDK.

    VBScript and JScript for Web pages and any COM-based language for server components (typically VB or VC++). Scripts are interpreted, while components are natively compiled. VB code also requires a runtime DLL (MSVBMxx.DLL). VBScript and JScript came into use in 1997, while COM grew out of OLE in 1993.

    Any language that supports the Common Language Runtime (20-plus in development). Initially compiled to an intermediate language (MSIL) and then JIT compiled to native code by the CLR at runtime or natively compiled (PreJit) at install time. Code written for the CLR is referred to as managed code. Support for the CLR will be shipped with future OSes starting with Windows XP Server released by the end of 2001.

    Class Libraries

    Standard Java classes found in the J2SE, plus the APIs (JDBC, JSP, EJB, JMS, JAXP, JCA, JFC, JNDI, and so on, as defined in the J2EE specification). In addition, vendors include their own extensions to J2EE for integration and differentiation in the marketplace.

    Win32, COM, MFC, ATL, and ASP. Five primary programming models that contain APIs that developers use in building solutions.

    Services Framework. A hierarchical set of managed classes arranged in namespaces. Provides a consistent programming model and unifies the APIs needed to build solutions.

    Deployment

    Java Package. Collection of Java classes assembled as a unit and arranged hierarchically. Weak versioning. Server-based deployment uses XML-based deployment descriptors, which are read and handled differently by each vendor's implementation. WebSphere includes an application assembly tool to handle this process.

    DLL, EXE. DLLs contain a collection of functions with weak versioning. EXEs represent an executable program with weak versioning. COM components are housed in DLLs, rely on the registry, and support immutable interfaces but no runtime version checking. Server-based installation accomplished through third-party utilities such as InstallShield.

    Assembly. Unit of deployment, security, and versioning. Includes built-in PKI support and metadata to tightly control binding of assemblies at runtime. Support exists in the class loader of the CLR for consistency and version checking. Server-based deployment can be done in a no-impact fashion by simply copying the relative paths that contain the application. Applications also can explicitly share components. Support for the Windows Installer included in VS.NET.

    Thin Client

    Java Server Pages (JSP). WAS supports JavaScript or Java in JSPs that are compiled into HttpServlets on the fly and are cached by the server. No native support exists for different devices, and there are no client-state services other than cookies. WAS ships with an HTTP engine (1.3.19) but can use Apache, Domino, Netscape, iPlanet, or IIS 4.0/5.0. WAS 4.0 is v1.1–compliant. The syntax of JSPs is a knockoff of ASP and was developed in 1998.

    Active Server Pages (ASP 2.0). Technology introduced by MSFT in 1997 in which pages containing server-side code are interpreted by an ISAPI server extension and can use simple HTTP caching through headers. No native support exists for different devices, and there are no client-state services other than cookies. ASP runs primarily on IIS 4.0/5.0 but has been ported to other platforms (see Chili!Soft, purchased by Sun). Performance of JSP and ASP is similar on similar hardware platforms.

    ASP.NET. ASP.NET pages are compiled into MSIL either statically or on the fly when a request is made. Server control architecture allows abstraction for different devices and state storage across HTTP POST events. Server controls allow developers to create "adaptive controls" to render HTML, WML, and so on as appropriate for the client platform. Runs on IIS 4.0/5.0. Beta performance tests indicate a 200–300% improvement over JSP and ASP.

    Web Server Processing

    HttpServlets provide a request/response model available to Java classes in addition to session-state services keyed with a client cookie. JSPs often call servlets as the controller that acts as the broker between presentation and business service layers to provide separation between the HTML and Java code. Because of the complexity of writing servlets many "two-tier Web apps" simply have the servlets make direct calls to the underlying database via JDBC. This leads to spaghetti code that is difficult to debug and maintain. The servlet engine is included in WAS and includes a JDBC connection manager that handles database connection pooling. WAS 4.0 is v2.2–compliant.

    The ASP runtime implemented in the ISAPI server extension provides a request/response model in addition to session- (keyed with a client cookie) and application-state services. ASP pages often call business services directly implemented as COM components, although many "two-tier Web apps" simply have the ASP pages make direct calls to the database via ADO. This leads to spaghetti code that is difficult to debug and maintain.

    The HTTP Runtime in ASP.NET provides an extensible mechanism by which developers can hook into the processing of resources on the Web server through HTTP Modules. Provides very tight integration with the Web server. Also supports a request/response model and application- and session-state services. Session-state services can be deployed on a separate server to increase scalability. Provides a sophisticated caching mechanism for pages and programming code. Provides complete separation of HTML code and programming logic through code behind.

    Object Services

    Enterprise Java Beans (EJB). Part of the original J2EE specification in 1998. Java classes that are deployed in component-oriented middleware (a container) that provides interception and adds services such as distributed transactions (using the Java Transaction Service [JTS] based on the OMG and using IIOP), security, and database connectivity. The container can run on the same server or remotely. EJBs come in two flavors: entity beans and session beans. Entity beans map to the state of an object as represented by a row in a database. Entity beans provide the mapping to the database and caching of the entity. Entity beans come in two styles: Container Managed Persistence (CMP) and Bean Managed Persistence (BMP). CMP beans allow the container to manage loading and saving the database information, whereas BMP beans provide methods for the developer to insert JDBC code directly. Session beans come in two flavors: stateful and stateless. Stateful beans maintain a conversation with a single client, whereas stateless beans can be reused by multiple clients, with the container handling the allocation. WAS 4.0 is EJB 1.1–compliant.

    Microsoft Transaction Server (MTS). Provides component-oriented middleware for COM components introduced in 1996. Provides interception and adds distributed transactions through the Microsoft Distributed Transaction Coordinator service (MSDTC), security, and object activation support. Objects can be both stateful and stateless, depending on administrative settings. Programmers take advantage of MTS services through the use of an API. Only components built in VC++ are free-threaded and thus perform better. No support for automatically mapping database rows to object instances exists.

    Component Services (COM+ 1.0). Released with Windows 2000 in 2000 and provides component-oriented middleware for COM components. Provides interception and adds distributed transactions, security, object construction, object pooling, queued components (for asynchronous integration with MSMQ), loosely coupled events for publishing and subscribing to components, and activation support. Objects can be both stateful and stateless, depending on administrative settings. Although built for COM, .NET programmers create serviced components in .NET by deriving their class from a system class and decorate it with attributes to describe the services that it uses. The system class then communicates with COM+ via Win32 and COM APIs. No support for automatically mapping database rows to object instances exists. (The IMDB product that was removed from prerelease versions of COM+ would have served a similar purpose as entity beans, although the ADO.NET DataSet object serves a similar purpose.)

    Database Support

    JDBC. Data Access API that allows SQL access to a tabular data source via drivers (there are currently 159 listed on Sun's site under 4 different types, ranging from JDBC to ODBC bridges to fully native-protocol Java implementations). Various drivers support connection pooling, distributed transactions, and rowsets, and some are J2EE-certified. The API is similar to the Win32 implementation of ODBC. JDBC 2.0 is the spec under J2EE 1.2, but 3.0 has been defined. Note that when using entity beans with CMP, the container provides the mapping to the database tables through a vendor-specific mechanism. WAS 4.0 supports JDBC core v2.1 and Extensions 2.0. WAS includes providers for DB2, MSSQL, Oracle, Informix, and Sybase.

    ADO/OLE DB. OLE DB is both a specification for COM interfaces that database vendors implement (OLE Providers) and a set of services (such as cursor processing and connection pooling) implemented in Windows to provide data access to a variety of data sources. ADO is a simplified automation layer that sits on top of OLE DB to provide data access to scripting languages and COM-based languages such as VB. Although typically used for tabular data access, both ADO and OLE DB can be used to access nonstructured data such as email and XML. OLE DB also can be used to access data through the plethora of available ODBC drivers.

    ADO.NET. A set of managed classes that provides access to data sources through what are called managed providers. These include TDS (SQL Server), OLE DB providers, and ODBC drivers. Each managed provider implements connections and connection pooling, commands/parameters, forward-only cursor processing, transaction processing, and error handling. ADO.NET also includes a middle-tier data cache object called a DataSet that provides an XML-based cache of data that can be used to bind to controls and synchronize changes to a data source through an adapter object implemented by the managed provider. Designed to support a loosely connected model with built-in XML representation of the data and XSD representation of the schema. Developers can work with relational data as XML data, and vice versa through the XMLDataDocument class.

    Messaging

    Java Messaging Services (JMS). JMS is a set of client interfaces to message-oriented middleware (MOM) products that supports both message queues and publish-and-subscribe metaphors. MOM vendors implement JMS providers. JMS includes a specification for a new type of EJB, message beans. WAS includes the (WebSphere MQ) MQSeries JMS provider. WAS 4.0 is compliant with the 1.0.2 specification and includes support for JMS-XA distributed transactions across MQSeries-enabled systems and databases. Need to obtain WebSphere MQ separately.

    Microsoft Message Queue Server (MSMQ). A MOM server product running on NT 4 and W2K that supports message queues but does not include a publish-and-subscribe feature built into the product. The product includes a COM-based API for sending and receiving messages and administering queues. Supports distributed transactions through MSDTC. MSMQ is built into Windows NT 4.0 Server.

    System.Messaging. A set of managed classes that provide the administrative and client APIs for working with MSMQ servers. MSMQ is built into Windows 2000 Server. It should be noted that developers can access MSMQ through queued components (QC) supported by COM+ 1.0. QC acts as an abstraction layer to allow clients to asynchronously make method calls on components that are backed by MSMQ.

    Fat Client

    Java Foundation Classes (JFC). JFC includes the Abstract Windowing Toolkit (AWT) and Swing as Java APIs for building GUII applications. Swing is a more abstract API and includes a "look and feel" for developing the same GUI on multiple platforms or adhering to a platform standard. Advanced graphics can be created with the Java2D and 3D APIs. GUI apps run as standalone applications or applets running in a browser.

    Win32/ActiveX. Applications written in VB, VC++, or other Windows development tools. Ultimately these tools make calls to the Win32 API for the underlying window management. ActiveX is a COM-based technology for building reusable binary visual components (.ocx) across development environments. Applications run as standalone applications or as ActiveX controls hosted in MSIE. Advanced graphics are available through the DirectX set of COM-based APIs.

    Windows Forms. Set of managed classes that allow for the creation of forms-based applications. Takes advantage of new Windows 2000 features such as nonrectangular forms. Includes a managed control architecture to build reusable visual controls. Third parties will provide wrappers for DirectX functionality. Windows Forms–based applications can run as standalone applications or can be hosted in MSIE on clients with the CLR installed.

    Integration

    J2EE Connector (JCA). JCA is a specification based on the IBM Common Connector Framework (CCF). WAS contains WAS adapters used to connect to packaged applications such as JDEdwards, SAP, Peoplesoft, and so on. These are JCA-compliant and are shipped with VisualAge for Java. You can also build new adapters using the MQSeries adapter offerings. WAS AE multiserver version only.

    SNA Server 4.0. Server product that includes OLE DB and ODBC support for AS/400 and DB2. Also includes COM Transaction Integrator (COMTI) for working with CICS and IMS transactions as if they were COM objects. Includes MSMQ-MQSeries bridge and host printing services, among others. Basically, this is COM-based integration, and there are also connectors to packaged products such as the SAP DCOM Connector.

    Host Integration Server 2000. Update of SNA Server. Also includes integration with Commerce Server, BizTalk, Active Directory, and Windows Management Instrumentation (WMI). BizTalk also supports application-integration components (AIC) that can be built to integrate with packaged applications; for example, there is a SAP R/3 AIC available.

    XML Support

    Java API for XML Parsing (JAXP). An API and abstraction layer to deal with various XML parsers. Not included in the J2EE 1.2, but 1.0 is in 1.3. v1.1 supports XSLT and DOM Level 2 and SAX v2.0. IBM has a 100% Java validating XML parser with JAXP support available on its Web site. WAS includes support for DOM 1.0, SAX 1.0, and XSLT 1.0.

    MSXML. Microsoft's COM-based XML parser, included as a standalone addition to the OS and in products such as MSIE. Version 3.0 sp1 is the current version, with v4.0 as a technology preview on the MSDN Web site. V3.0 supports XSLT, XPath, and SAX2. Implements much of the DOM functionality specified by the WS3C, in addition to SAX support for event-based processing of large XML documents.

    System.Xml. A set of managed classes that implement the DOM, XSLT, and XPath specifications by the W3C. Supports both a tree-based model (DOM) and an innovative stream-based approach for parsing XML documents. Also contains a class that maps XML documents to the ADO.NET DataSet class to provide XML-based access to relational data.

    Web Services

    WAS ships with the Apache SOAP 2.2 tool support. The toolkit is SOAP 1.1–compliant. Can expose Java classes, EJBs, BSF scripts, or DB2-stored procs as a Web Service. Includes a command-line utility to publish EJBs as SOAP services. Development tools contain wizards to create WSDL from an existing Java application or read WSDL to create a server stub or client proxy. UUDI4J support is also included for client-side interaction with UDDI registries.

    SOAP Toolkit 2.0. Downloadable. Current release is sp2. Provides a COM wrapper for implementing Web Services. Wizard exposes COM objects as a Web Service using ASP or IIS ISAPI extensions. Support for WSDL 1.1. A separate UDDI SDK is available for download, and provides a COM API for building and querying a UDDI registry. The toolkit integrates into VS 6.0 so that creating Web Services from COM components is straightforward.

    .NET Framework. SOAP 1.1 is implemented in a variety of the base class libraries and, therefore, is very tightly integrated from both consumer and implementer perspectives. Allows individual methods in managed classes to be exposed as Web Services through an attribute of the framework. Automatic creation of WSDL from XSD schemas and managed classes. Automatic creation of managed client proxies from WSDL through the command line and UI in VS.NET with full Intellisense. A separate UDDI SDK is available for download that provides managed classes for building and querying a UDDI registry.

    Remoting

    Remote Method Invocation (RMI)-Internet InterORB Protocol (IIOP). Provides the programming model (RMI) and the protocol layer for (CORBA IIOP) Java-to-Java communication. Servlets and applets communicate with EJBs via RMI. Assumes a tightly bound model that creates firewall issues and is not well suited to the Internet.

    DCOM. Extension of COM for component communication across the network using any of the Windows NT network protocols. Includes remote activation and security features. Remoting of object instances must be specifically programmed into the COM objects themselves. Assumes a tightly bound model that creates firewall issues and is not well suited to the Internet.

    .NET Remoting. Implemented in a set of managed classes. Allows managed code to communicate across app domain boundaries. Can communicate via HTTP or TCP channels. Supports remoting of object instances via binary or SOAP protocols. Supports singletons and client activation. The use of HTTP and SOAP promotes a loosely coupled architecture that does not incur firewall problems.

    Naming Services

    Java Naming and Directory Interface (JNDI). Programming interface that provides access to directory services such as DNS, LDAP, Novell (NDS), and CORBA COS through vendor-specific providers.

    WAS 4.0 is JNDI 1.2–compliant for EJB lookup. The IBM SecureWay Directory 3.2.1 product is included in WAS for access to Active Directory, Lotus Domino, and NDS.

    Active Directory Services Interface (ADSI). COM programming interface that supports access to NT, LDAP, and Novell (NDS) directory services through vendor-specific providers.

    Active Directory and System.DirectoryServices namespace. Windows 2000 Server includes the distributed directory used in a Windows 2000 domain while the managed classes, in DirectoryServices provide a wrapper around the ADSI interfaces to programmatically access a directory.

    Development Tools

    WebSphere Studio, Visual Age for Java. Both ship with WAS. Studio is used to build the visual representation of Web pages and JSPs, while Visual Age is used for Java coding of servlets, beans, and EJBs.

    Visual Studio 6.0, released in 1998 (three IDEs). Separate IDEs exist for VC++/Visual Interdev for ASP development, and VB for form and component development. Graphical Web development.

    Visual Studio.NET. Single IDE that supports unified debugging, project management, Intellisense, Server Explorer, graphical editor for the Web and forms, class view, dynamic help, add-ins, and scripting. Can be used to build console applications, Windows Forms, Web Forms, Web Services, Windows Services, and components. Third-party compiler vendors can plug into VS.NET.

    B2B Integration

    ebXML. An industry specification (not a shipping product) for performing business-to-business transactions using XML and the Web. Includes some support for SOAP. Not implemented in WAS. Would need to roll your own infrastructure perhaps using Web Services.

    No support on NT 4. Would need to roll your own infrastructure using the SOAP Toolkit and Windows services.

    BizTalk Server 2000, released in 2000. A separate server product that provides a messaging/scheduling engine and business process orchestration facilities. Messaging includes support for EDI, SOAP, and Rosettanet grammars, in addition to others.

    Key Strengths

    For organizations that must have platform neutrality, J2EE is the only alternative. The Java language is becoming more widely accepted. Vendors such as IBM offer a single-vendor solution when dealing with legacy applications. Separation of application logic and presentation exists, although, in practice, this is underutilized. EJB model includes automatic database-mapping facilities through CMP.

    Large base of VB/ASP developers, resulting in reduced costs. Runs on commodity servers that can be scaled out. Software costs are low. Multiple language support through COM. Tight integration with the dominant client platform (Windows).

    Multiple languages supported with a common set of class libraries. Unified programming model with the Services Framework. High productivity development environment. Web application performance. Runs on commodity servers that can be scaled out. Separation of application logic and presentation exists. Greater integration with XML and Web Services protocols. Tight integration with the dominant client platform (Windows).

    Key Weakness

    Single-language solution. Smaller base of developers. EJBs are complex and not widely used. Thus, JSPs are overused, resulting in spaghetti code. Varying levels of J2EE conformance across vendors. The need to use vendor-specific features leads to vendor lock-in. Performance varies due to vendor-specific implementations. Software cost is generally higher, developer costs are higher, and deployment time is increased.

    Highly fragmented programming model. COM infrastructure is unwieldy, leading to DLL hell and versioning problems. ASP pages that do not utilize COM for business and data-access services lead to spaghetti code. Single-vendor solution.

    Not a shipping product. OO nature of CLR makes development initially more complicated for VB/ASP developers. Single-vendor solution. Does not support an automatic mapping of database rows to objects as with CMP, although there is widespread disagreement within the industry as to whether entity beans are desirable because they do not promote transactional consistency and are questionable in terms of performance. For more information, see Roger Session's Web site.



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    SUN 212-055 Exam (Sun Certified Programmer for the Java 2 Platform.SE 5.0) Detailed Information



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