|Exam Name||:||Sun Certified Programmer for the Java 2 Platform.SE 6.0|
|Questions and Answers||:||305 Q & A|
|Updated On||:||February 15, 2019|
|PDF Download Mirror||:||Pass4sure 310-065 Dump|
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310-065 exam Dumps Source : Sun Certified Programmer for the Java 2 Platform.SE 6.0
Test Code : 310-065
Test Name : Sun Certified Programmer for the Java 2 Platform.SE 6.0
Vendor Name : SUN
Q&A : 305 Real Questions
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KYOTO, Japan, Feb. 6, 2019 /PRNewswire/ -- wireless contraptions equipped with the new international wireless communication specification Wi-solar FAN (field enviornment network) for the information superhighway of issues developed collectively via the research community of Professor Hiroshi Harada of the Graduate school of Informatics, Kyoto school (hereinafter Kyoto college), Nissin techniques Co., Ltd. (hereinafter Nissin systems), and ROHM Co., Ltd. (hereinafter ROHM) grew to be one of the most world's first options to obtain Wi-solar FAN certification.
BackgroundIn order to recognize outdoor communique networks such as sensible cities and wise grids, notable, lengthy-distance and cozy community expertise is required. Wi-sun FAN is a brand new specification of Wi-solar, a global radio communications project that's the optimum appropriate to the development of IoTs. it is an interoperable communications networking method for electrical energy, gas, and water metering, as well as for sensible cities and wise grids in a lot of purposes corresponding to infrastructure and intelligent transport programs.
This Wi-sun FAN is an interoperable low-power IoT instant verbal exchange technology that utilizes low-energy instant transmission technology in line with the IEEE 802.15.4g usual and multistage routing technology in line with IPv6. On might also 16, 2016, the Wi-sun Alliance, which certifies wireless conversation requisites for IoTs, technical compatibility, and interconnectivity, dependent typical standards, and on November eleven, 2016, the three parties introduced that they succeeded in basic radio traits appropriate with Wi-sun FAN. The Wi-sun Alliance then announced its Wi-sun FAN certification application on October three, 2018.
This achievementBased on the results of the fundamental building of Wi-solar FAN, the three parties developed a radio suitable with Wi-sun FAN technical specifications and certification software, and handed an IP-primarily based certification verify the usage of multi-hop, frequency-hopping, and advanced certification security by using a plurality of distinct radios from distinctive corporations. This radio has right here features as described within the Wi-sun FAN Technical requisites.
p>With the IEEE802.15.4/4g/4e technologies in a position to good transmission over 1km under the japanese legislation, this radio is fitted with a global general for web access, which has been added in Wi-Fi (TM) techniques, and a multi-hop international usual that realizes multi-stage relay between radios in accordance with IP. This makes it effortless to connect sensors, meters, and displays that make up smart cities and sensible metering to the cyber web.
This fulfillment become carried out within the Impulsing Paradigm exchange via Disruptive technologies software (affect) led by the Council for Science, expertise and Innovation, the cabinet workplace. This application became fashioned via a joint industry-academia consortium called the subsequent-generation Wi-solar Joint analysis Consortium, Kyoto. The three parties, primarily based in Kyoto, are Kyoto school, which have a song checklist of standardization and development of IEEE 802.15.4/4g/4e, Nissin programs, which commercializes Wi-solar-appropriate verbal exchange middleware, and ROHM, which develops conversation modules compatible with the average.
define of certification acquisition:Date and time of certification acquisition: January 30, 2019Certification authority: Wi-sun AllianceCertified checking out laboratory: Allion Labs, Inc.Certification number: WSA 0171
Future developmentIn the longer term, the three parties will participate in an interoperability specification verification event sponsored by means of the Wi-solar Alliance to make contributions to testing for technical conformity and interoperability of the Wi-solar FAN commonplace, and to advertise extra construction as trade-academia cooperation tasks in Kyoto with a purpose to implement this radio in society. The outcomes had been also displayed on the Wi-solar Alliance sales space in DistribuTECH 2019, the greatest vigour business-related adventure within the u.s., which become held in New Orleans on February 5.
further particulars are available at:http://www.dco.cce.i.kyoto-u.ac.jp/en/PL/PL_2019_01.html
View common content material:http://www.prnewswire.com/information-releases/kyoto-institution-teaming-with-2-jap-businesses-acquires-world-first-certification-for-wireless-communication-specification-wi-solar-fan-300790447.html
supply Kyoto tuition; Nissin systems Co., Ltd.; ROHM Co., Ltd.
Copyright (C) 2019 PR Newswire. All rights reserved
ATLANTA, Oct. 1, 2018 /PRNewswire/ -- Landis+Gyr (SWISS: LAND.SW) introduced its help for the Wi-solar FAN Certification program launched by the Wi-solar Alliance previous nowadays. As a Promoter Member of the Wi-solar Alliance that holds a Board of administrators position, Landis+Gyr joins different member groups in advertising the implementation of open, necessities-based box area network (FAN) and the web of things (IoT).
Utilities have utilized container enviornment networks to supply coverage for communicating assets akin to smart meters, sensors and automation gadgets throughout their carrier territory. With the increase in sensible city functions, normal requirements for FAN connectivity will increase the choices accessible for purposes and gadgets in a position to be a part of the community.
Wi-solar's FAN Certification program will give compliance testing of community accessories and contraptions to a communications profile developed from relevant open standards and certify the product's capacity to interoperate.
"Landis+Gyr strongly supports this certification effort for the future cost it is going to add for utility grid modernization and IoT programs," mentioned Marius Chilom, Senior vice chairman and Chief technology Officer of solutions for Landis+Gyr. "The enhanced the interoperability, the greater valuable these networks will be for the subsequent wave of sensible grid and wise city applications."
"Certification ensures interoperability, which is vital to the boom of IoT innovation," pointed out Phil Beecher, President and CEO, Wi-sun Alliance. "we are blissful to formally launch the FAN Certification program and are excited for the first wave of FAN-certified products to be deployed into the market beginning Q1 2019."
The certification application will be certain utilities, cities and service suppliers have access to adaptable, multi-carrier networks that allows you to help be certain interoperability into the long run. other key merits for community operators include:
All Wi-solar certified products are fastidiously established by means of a Wi-sun appointed third-birthday party examine lab to ensure the contraptions work collectively without difficulty and securely for swift time to market. licensed instruments consist of a digital certificates to authenticate entry to a Wi-sun FAN, enormously decreasing vulnerability to cyber security threats. beneath a separate settlement, Wi-sun Alliance has appointed GlobalSign because the third-birthday party service provider of digital certificates for the Wi-sun FAN certification software.
About Landis+GyrLandis+Gyr is the leading world company of built-in power management options for the utility sector. offering one of the crucial broadest portfolios of products and capabilities to tackle complicated trade challenges, the business grants finished solutions for the groundwork of a better grid, together with sensible metering, distribution network sensing and automation equipment, load handle, analytics and energy storage. Landis+Gyr operates in over 30 nations throughout five continents. With sales of approximately USD 1.7 billion, the business employs c. 6,000 individuals with the only mission of helping the world manage power more desirable. more assistance is purchasable at www.landisgyr.com.
about the Wi-sun AllianceThe Wi-sun Alliance is a global non-earnings member-based association made of industry leading agencies. Its mission is to drive the global proliferation of interoperable wireless options to be used in sensible cities, smart grids and other internet of things (IoT) purposes using open global requisites from organizations, similar to IEEE802, IETF, TIA, TTC and ETSI. With greater than a hundred and eighty participants global, membership of the Wi-sun Alliance is open to all business stakeholders and comprises silicon carriers, product companies, functions providers, utilities, universities, agencies and municipalities and native executive organizations.For greater counsel, please discuss with: www.wi-sun.org.
Wi-solar Alliance and the Wi-solar Alliance brand are trademarks of the Wi-sun Alliance.
View customary content:https://www.prnewswire.com/news-releases/landisgyr-helps-lead-wi-sun-alliances-fan-certification-application-for-significant-scale-iot-conversation-networks-300721548.html
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GlassFish, and its associated Technology Compatibility Kit (TCK) code, has been fully migrated to Eclipse Foundation stewardship. The new release, Eclipse GlassFish 5.1.0, is now fully Java EE 8 certified, which represents a key step to ensuring backward compatibility of Jakarta EE.
GlassFish is the reference implementation of Java EE, in other words, the standard from which all other implementations and corresponding customizations are derived. GlassFish was initially created by Sun Microsystems for the Java EE platform and is now sponsored by Oracle, who have a supported version called Oracle GlassFish Server.
GlassFish supports Enterprise JavaBeans, JPA, JavaServer Faces, JMS, RMI, JavaServer Pages, and Servlets, meaning that developers can use it to create enterprise applications that are portable and scalable, and that integrate with legacy technologies.
The idea of transferring Java EE sources to the Eclipse Foundation was announced at the 2017 Oracle JavaOne conference
The new release, GlassFish 5.1, has been fully tested under both the open source TCK and proprietary Oracle Java EE 8 TCK. The Eclipse Foundation says that the completion of the new version was a key accomplishment in allowing work to begin on the release of Jakarta EE 8. The Eclipse Foundation aims to have Eclipse GlassFish 5.2 be a Jakarta EE 8 compatible implementation, and the Foundation has gained the support of all of the major vendors who have Java EE 8 compatible versions of their commercial products. The companies have all committed to ensuring their products are Jakarta EE 8 compatible as well.
The migration has been described as "an enormous engineering and legal challenge". Java EE TCKs are open-sourced and hosted at the Eclipse Foundation. In addition, the Eclipse GlassFish code base was re-licensed from CDDL+GPL and Classpath to Eclipse Public License 2.0 plus GPL with the Classpath Exception.
The developers say this has been a massive amount of work. The Java EE source-code contains over 5.5 million lines of code and over 2.2 million lines of comments in more than 61,000 files. For comparison, it’s around the same as the server side of World of Warcraft and the Linux Kernel 2.6.0. The CTS/TCK contains over 4.6 million lines of code and over 1.1 million lines of comments in more than 34,000 files. It’s comparable with the codebase of Windows NT 3.1 and Photoshop CS6.
Java EE Is Renamed Jakarta EE
Java Guardians To The Rescue Of Java EE
Java EE 7 and Glassfish 4.0 at JavaOne
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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:
The tool can also parse Sun's Java garbage collector traces, including the following:
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.
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