|Exam Name||:||WebSphere Application Server V5.0, Basic Administration|
|Questions and Answers||:||112 Q & A|
|Updated On||:||February 21, 2019|
|PDF Download Mirror||:||Pass4sure 000-340 Dump|
|Get Full Version||:||Pass4sure 000-340 Full Version|
000-340 exam Dumps Source : WebSphere Application Server V5.0, Basic Administration
Test Code : 000-340
Test Name : WebSphere Application Server V5.0, Basic Administration
Vendor Name : IBM
Q&A : 112 Real Questions
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in this chapter, we have examined the fundamentals of HTTP session management and outlined some alternatives for conserving utility state with HTTP session. now we have considered how changed into implements HTTP session and coated both procedures for persisting session statistics to a database and memory to reminiscence. We additionally lined probably the most efficiency implications of the session administration configuration alternatives and discussed some troubleshooting tactics.
1 or not it's worth noting that this is basically a terrible use of a session. classes are not designed for amazing "permanent" storage. by means of storing the shopping cart in a session, if there have been a client failure (most likely the browser crashed), the user would lose his or her complete looking cart. that's a superb approach to lose a sale. vital assistance is more suitable kept in a database without delay.
2 here's because all the application servers (in each cells) ought to be described as "consumers" to that server, and the admin console best offers you the ability to give one replicator IP handle and port at a time on a server, so if that replicator were to head down, then it might amount to a SPOF (single aspect of failure). This differs from the default conduct in a single phone, where the distinctive software servers in a replication area may also be configured in a "customer server" configuration.
three The longer default interval changed into with ease the result of restrained testing and construction resources that have been attainable just before the V5.0 unencumber. the ten-2d interval is a suggested beginning element in V5.0 and V5.01, though you might also want to tune it to your utility and ambiance.
"Liberty Profile" - IBM WebSphere utility Server V8.5
IBM WebSphere application Server V8.5 Liberty profile is a flexible and dynamic server profile of was which makes it possible for the changed into server to set up simplest required custom points as an alternative of deploying a big set of available JEE add-ons.
what is Liberty profile in IBM become?
Liberty Profile is a part of IBM WebSphere application Server V18.104.22.168. It is awfully light-weight profile of WebSphere utility Server. Liberty profile is a versatile and dynamic profile of turned into which enables the changed into server to installation simplest required custom facets as an alternative of deploying a big set of purchasable JEE accessories. builders can opt for required features in response to enterprise requirement and push it to app server. changed into Liberty profile is most effective perfect for builders working on mission vital enterprise functions. It can be even used for construction deployment. present edition of IBM become Liberty profile is Java EE 6 criticism and works neatly for functions using this Java EE 6 licensed internet profile.
Liberty profile is often known as easy weight, down sized version of was starting from 8.5. we will choose to use the equal for software building if we now have constrained and neatly defined set of server components.
changed into Liberty profile structure
structure part Description
"Liberty profile is a part of IBM turned into Product and it is shipped as an in-developed core characteristic of the WebSphere application Server. Liberty profile is not in any respect a separate product. it is a runtime atmosphere for software server (became) with a rich characteristic set that varies by way of WebSphere application Server diverse variations.”
How changed into Liberty Profile Works?
If web-utility requires simplest a servlet engine, then rather than starting all different accessories liberty profile best begins the changed into kernel, the HTTP transport and the internet container in order that builders can quickly birth and deploy the applications.
If an software wants persistence function in their software and would want to use JPA company element to entry relational statistics (RDBMS), developer simply should add JPA configuration in XML and Liberty profile will make it obtainable persistence within the application.
The set of facets which we are able to define in <featureManager> tag describes the concrete profile for the configured server particular instance after which these lists of facets are tailor-made for the software deployed to the software server. Internally, these points are a discrete set of JARs which is nothing but the OSGi bundles which are initialized and started as soon as they are delivered to the server configuration file (e.g. server.xml ). <function> tag is use to outline app specific JEE features.
the liberty profile works on a dynamic runtime atmosphere called OSGi runtime. OSGi capabilities are used to manipulate JEE primarily based part lifecycles, and the injection of dependencies and their runtime configuration. After this step server method and contains a single JVM, everyday because the Liberty kernel, and any number of not obligatory facets required via the applications. After that configured characteristic code and many of the kernel code each runs as unbiased OSGi bundles or OSGi modules inside an OSGi framework (Open system Gateway).
the liberty profile supports a subset of the complete WebSphere utility Server programming model. It helps below kinds-
OSGi Framework Lifecycle
OSGi framework follows OSGi Lifecycle for his or her Bundles. below is the commonplace lifecycle of OSGi.
how to set up was Liberty profile?
There are two tips on how to down load and set up the freedom profile runtime
Please refer beneath URLs for down load
Why may still i take advantage of turned into Liberty Profile?
There are some key advantages of the use of Liberty profile runtime which is listed under:
become Liberty profile standard configuration
Liberty profile makes it actually convenient to configure our server in a extremely fundamental and efficient manner using XML file. for example, default server.xml configuration file might also seem like under:<server description="verify server"> <!--permit features which you would want to use --> <featureManager> <feature>jsp-2.2</function> </featureManager> <httpEndpoint identity="appHttpEndpoint" host="localhost" httpPort="9080" httpsPort="9443" /> </server>
As per above default server.xml configuration in reality enables the JSP 2.2 function, which is dependent upon the Servlet three.0 feature; hence the Servlet function is instantly enabled. We needn't to name and outline it explicitly in become server.xml configuration file.
become Liberty profile configuration "Code Snippets"
under are some code snippet to configure turned into Liberty Profile. we can use the equal as and when required in the utility building.<server> <featureManager> <function>servlet-3.0</function> <feature>mylocalConnector-1.x</characteristic> </featureManager> </server>
above code will allow servlet-three.0 API and myLocalConnector-1.x for the configured software in the IBM WebSphere Server.<server description= "Dev Server DV 33-04"> <featureManager> <function>servlet-three.x</feature> </featureManager> <application id="TestWebApp" place="WebApps/verify.war" name="TestWebApp" classification="conflict" </server>
above code will enable servlet-three.0 API and a dependent warfare file named as verify.conflict below net utility TestWebApp.<server description="My test server"> <featureManager> <!--allow jndi api for datasource lookups --> <feature>jndi-1.0</function> </featureManager> </server> above code will enable jndi-1.0 edition for software. <customer> <featureManager> <feature>javaeeClient-7.x</function> <featureManager> <software id="CLIENT_APP_ID_VALUE" identify="CLIENT_APP_TYPE" class="ear" location="clientAppType.ear"/> </client>
above code will allow java client api v7 and practice this to when install as an EAR file.
datasource configuration snippet<?xml version="1.0" encoding="UTF-8"?> <server description="My check DB server"> <!-- allow elements --> <featureManager> <feature>jdbc-4.x</feature> </featureManager> <datasource databaseName="$became.server.dir/CustomerDB" id="datasource_id" jndiName="statistics/jndi/lookup/bank/CustomerDB" </server>
above code will permit jdbc-4.0 API and permit configured database identify based on jndi look up.
general JEE specification in was Liberty profile
beneath Oracle JEE/J2EE/JSR necessities are available in good IBM was Liberty profile. developers can configure any aspects the use of above code snippets in line with software requirement.
1. the liberty Profile is free to use which is first rate however most effective in development ambiance now not in creation environment. If we want to circulate to creation with the freedom Profile we can in any case deserve to pay the standard IBM became licensing cost which doesn't sounds good.
2. There are different lightweight servers available today in the market which is free even for production environment so picking out Liberty profile over these alternate options nevertheless should be evaluated.
three. the freedom Profile does not give any UI like administrative console to operate server selected valuable configuration movements like updating the server config or setting up/uninstalling functions etc. so we have to count on Eclipse/RAD/NetBeans editor to replace the server.xml file or we have to manually adjust it which doesn't seem a possible option for developers.
4. utility developers compare this server to Tomcat and Glassfish which have already been round for a long time so it may be one of the crucial biggest challenges for moving to liberty profile.
5. In newest edition liberty profile is developing with lot of new facets so it may be interesting to look how the freedom Profile handles the increase performance load with both footprint and dimension (approx. 60MB).
6. For lower IBM WebSphere Server versions (5, 6, 7) it is not appropriate which can be a problem for developers and applications the use of them.
In a nutshell we can say that Liberty Profile is one of the quickest altering and most unique app servers to observe on the market these days. So we may still definitely center of attention on their upcoming releases. New Beta versions are coming up very immediately available in the market with lot of latest facets which could use in our applications with simply an easy configuration. IBM should really focus on constructing UI and some Migration Apps for Liberty Profile developers so they can hastily undertake it as examine to other essential rivals like Tomcat, Glassfish, Joss and so on. It should be truly unique to look how the newest models of Liberty Profile tackle the raise performance with each footprint and size which is the foremost plus with IBM changed into Liberty Profile.
February 4, 2019 Timothy Prickett Morgan
there are lots of things that one might constructively criticize IBM about when it comes to the vigor methods platform running the IBM i operating gadget. however, in contemporary years at the least, a kind of issues would no longer be – and could no longer be – that the business has no longer performed adequate to include the most crucial facets of the modern programming toolbox.
in fact, the company has completed and increasingly respectable job of embracing and lengthening the compilers, interpreters, frameworks, and fashions of the programming languages which have long past mainstream because Java first took the stage at the start of the dot-com growth in 1996 as an attempt to bring a simplified variant of C++, dwelling in an idealized, simplified, and importantly transportable hardware abstraction called a digital computer. due to the fact that that point, massive Blue and the IBM i group have labored together, frequently with the group out in front with the energetic involvement of the IBMers within the developerWorks corporation, to convey the Apache web server and the Tomcat application server the OS/400, i5/OS and IBM i platform together with programming languages corresponding to Perl, Hypertext Preprocessor, Python, and Node.js, and versioning equipment comparable to Git, and other techniques utility that are are standard tools for contemporary programmers.
The 2019 edition of the IBM i industry Survey, which turned into released in January and which is spearheaded via Tom Huntington, executive vice president of technical solutions at HelpSystems, offered some insight into what's going on obtainable on the programming entrance. The survey became performed ultimate October and had seven-hundred respondents, with 57 p.c coming from the us however handiest 2 percent from Canada; one more 19 p.c came from Europe, 15 percent got here from Latin america, and the the rest turned into break up across Australia, Asia, and Africa. As we now have stated earlier than, here is not exactly representative of the precise IBM i installed base, which is extra heavily dispensed outdoor of the U.S.; however the numbers are step by step moving within the appropriate path as HelpSystems interprets the survey into greater languages and businesses such because it Jungle inspire readers to take the survey.
The variety of operating techniques supported on the power systems platform and the potential to snap in equipment created for Unix-like working techniques into the PASE AIX runtime embedded in OS/four hundred and its successors is a key point to the capability to get and use equipment that different systems have. (during this method, IBM preserves its personal advantages comparable to RPG company language programming and an built-in relational database management system and grafts on the advantages of alternative structures, giving it a kind of hybrid power.) And IBM i stores have been embracing that operating gadget diversity on the platform and becoming less stylish on windows Server machines working on X86 iron elsewhere in the datacenter, as which you can see from this operating equipment distribution from the survey:
best 22 percent of the agencies surveyed pointed out that they had been handiest operating the IBM i platform, and albeit, we find it hard to trust that this quantity is not zero % given how pervasive home windows file and print servers are. however it is possible to head it by myself with IBM i, most likely in factory or far off retail settings, and it is feasible so we will take the survey respondents at face value. what's enjoyable in this chart is that the share of home windows Server is falling. again within the day, someplace north of 95 percent of IBM midrange retail outlets stated the usage of windows Server alongside their OS/four hundred and i5/OS machines, and this has been trending down as Linux, both on vigor systems iron inner of PowerVM logical partitions and on outboard X86 systems, is on the rise. AIX has gained some penetration at IBM i shops, too, both on distinct energy programs equipment and on PowerVM partitions on the identical machines running IBM i.
As you might think about, RPG is still probably the most widely wide-spread programming language in use at IBM i retail outlets, with over 84 percent of respondents announcing they use RPG to create purposes (or purchased RPG functions from third birthday party application companies that do). The SQL database programming language ranks quantity two, at seventy two %, adopted via the CL scripting language native to IBM at forty seven percent and Java at forty one percent. here’s the rundown of programming language adoption:
There are a few entertaining things happening right here. First, while 68 percent of retailers report using windows Server of their IBM i shops, simplest 17 % say they're using the .internet framework from Microsoft for programming, which helps visual primary and the Java-inspired (that’s the nice manner to claim that) C# languages. we'd have concept that after two and a half a long time, Java would have been up there with RPG and SQL as a favored language, but that has no longer happened. The percentage of COBOL is in regards to the historical style and tends to be focused in the financial capabilities and assurance industries where code became ported from mainframes so many a long time ago.
organizations have been surely allowed to put down multiple programming language as a part of the survey, and if you add up all the percentages, you get 320 %, which means an arithmetic mean of 3.2 languages in use per web site on standard throughout the IBM i put in base. (smartly, at the least this upper echelon – wherein we mean the active element, now not the largest groups or these with the biggest machines – a part of the IBM i base. We don’t understand anything in regards to the americans who don’t take surveys and we suppose that the information that changed into gathered for the five years of the IBM i industry Survey are consultant of those energetic shops. That capacity those that retain their techniques and operating methods extraordinarily present and that are typically extra inclined to undertake newer applied sciences, starting from storage area networks to high availability clustering to superior programming thoughts.) we're of two minds about this regular. First, RPG, SQL, and CL dominate, and mixed they offer you an ordinary of two languages. We feel there are a lot of websites that principally use RPG and SQL, certainly folks that have third celebration software utility. it's important to recognise that the survey question turned into not what languages have been used to create your applications, but quite what languages are used for brand spanking new utility development. So the base could have a lot more different and a better numerical distribution of compilers and interpreters than this records implies. I don’t believe this is the case, nevertheless it likely averages greater like five languages as a result of whether or not they realize it or no longer, there’s likely some SQL, CL, or Java running someplace in the software stack.
The survey requested businesses about what open source technologies they have deployed in their IBM midrange stores, and trust it or not the Apache net server, which IBM first commercialized as the kernel of WebSphere again in 1998, remains on the upward thrust and that is doubtless occurring as fewer and fewer shops use home windows Server for application and web serving and greater retail outlets go native. That the native Apache web server has simplest 40 % penetration tells you what those windows Server that remain are doing. it's a mixture of print, file, web, and software serving plus a healthy dose of SQL Server for analytical database processing that businesses don’t wish to deploy natively on their IBM i machines. Python and Node.js are on a gentle upward thrust, and the Git versioning device is finding its personal degree, too.
What we are able to’t comprehend from the first 5 surveys and what we'd like to comprehend within the sixth next 12 months is what percentage of RPG is being coded in the modern free form vogue that is extra like what Java does and what number remains the use of the older college, extra tightly limited older RPG model. My guess is that for new code, it is doubtless as high as half and half, and that's mirrored within the incontrovertible fact that about have of the agencies surveyed mentioned that that they had bought Rational Developer for i and have been the use of it for at least some utility coding. About a third of the agencies that have RDi say they're the usage of it for all of their application construction, about a third say it is round half and half, and a third say it is below half. normal that out and it's averaging around half of the purposes at half of the agencies surveyed are achieved the use of RDi, which means free kind RPG.related experiences
The IBM i Base Did certainly movement On Up
The IBM i Base Is able to stream On Up
investment And Integration indications For IBM i
safety nonetheless Dominates IBM i discussion, HelpSystems’ 2018 Survey displays
The IBM i Base not As Jumpy as it Has Been
The Feeds And Speeds Of The IBM i Base
IBM i Priorities For 2017: Pivot To defense
IBM i tendencies, issues, And Observations
IBM i Survey gets more advantageous As Numbers grow
where Do these IBM i Machines Work?
discovering IBM i: A game Of forty Questions
it's time to tell Us What you are as much as
IBM i industry Survey: The value Of Being Earnest
What’s Up in the IBM i marketplace?
IBM i market Survey Fills within the Blanks
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J2EE application servers are Web application server products that adhere to standards and technologies advocated by Sun's J2EE specifications. They all offer a standardized development and runtime environment for application components.
Codes built on top of J2EE application servers are portable across one another. For example, a servlet developed over BEA's Weblogic server can be deployed in IBM's Websphere server without any code-level changes.
To ensure compatibility of application components across different breeds of servers, Sun has released a J2EE licensing scheme and a J2EE compatibility test suite (CTS). Vendors who have obtained the J2EE license and passed CTS can call their products "J2EE-certified."Choice of Application Servers
Because it is a lucrative market with a growth potential of several billion dollars, almost all major IT companies have jumped onto the application server bandwagon. These companies include ATG, BEA Systems, Borland Corp, Broad Vision, Brokat, Compaq, Computer Associates, Fujitsu, Hewlett-Packard, Hitachi, IBM, Macromedia, NEC, Nokia, Oracle, SAP, Silver Stream, Sybase, TIBCO Software, WebGain... All of them are J2EE licensees, and many of them have rolled out their very own J2EE-certified application servers to the market.
Combine this list of J2EE licensee companies with other application server companies that are yet to join the licensing scheme, and you end up with a highly crowded market place, with each product trying to carve out its own niche segments.
According to various market survey reports, BEA's Weblogic server and IBM's Websphere dominate the J2EE application server market, followed by other players such as Oracle. Ironically, Sun's own J2EE application server product (called iPlanet, and now renamed as the Sun ONE application server) is yet to make a major impact in the application server arena.
One application server that is not yet J2EE-certified, but is well worth taking a look at is JBoss (http://www.jboss.org). This open source application server is making significant inroads into the enterprise environments.How to Choose Your Application Server
Choosing a particular application server for a given enterprise environment is no easy task. With a rich set of development and runtime features, each application server vendor lures companies to adopt its own product.
In the following sections, we try to identify all major features of application servers that are important for an integrated, Web-based enterprise IT architecture. The relevance and importance of specific features in a given enterprise environment should ultimately dictate the choice of decision-makers.Essential Features of Application Servers Scaling
Scaling is the capability of the application server to meet dynamic site traffic and serve the increasing number of client requests.
Ambiguous Web traffic volume is a potential problem for the server administrators. When not handled properly, it may well take the server to its limits, resulting in system crashes.Load Balancing
Load balancing is the capability to distribute the client requests to different servers under the same cluster. Simple hardware solutions are already available for less-intelligent request routing. In the case of application servers, however, we are talking about a much higher level of load balancing, in which distributed application components instead of client requests are load balanced.Fault Tolerance
Fault tolerance is the capability to resume operations in spite of component failures, network failures, and server crashes. In production environments, usually several servers are configured to work in orchestration with each other. Thus, when one server in the group fails, the other can take up the additional load.Transaction Monitoring
Application servers should be capable of doing effective business transactions across multiple server instances and networks. Two-phase commit might be important for certain critical enterprise transactions.
How well the application server monitors and ensures transactions is an important feature to be considered.Availability of Resources
An application server's resources—such as memory, computing power, components, databases, and other backend systems—should always be available to serve client requests. It is the responsibility of the application server to ensure that no client request gets timed out due to the lack of computing power or components to service the request.Performance
Performance can be generally thought of as the capability of the application server to attend to the client's request within the earliest possible timeslot. For this to succeed, the server must be capable of processing the transactions between the clients and back-end resources efficiently.
Some application server vendors and independent market watch firms have come out with their own benchmarks (for example, ECPerf) for measuring the performance of the application server. A typical benchmark is "so many thousand requests handled per second" under a given configuration.Platform/OS Support
Java- and J2EE-based servers naturally support more operating systems and platforms than other kinds of application servers. In enterprise server environments, UNIX flavors and Linux dominate, whereas developer platforms are often Windows-based.
Note that Microsoft's .Net architecture (a direct competitor to Java/J2EE) is available only in MS Windows platforms.Tools and IDE Support
Many application servers come bundled with development tools and integrated development environments (IDEs) for developing and deploying applications with ease. The quality and ruggedness of the tool, as well as its integration with a given application server, are decisive factors for an application server choice.
Examples include IBM's VisualAge, which comes with the IBM Websphere application server; and WebGain Studio, which is the preferred IDE for BEA's Weblogic.Development and Runtime Licenses
Certain application servers offer free development licenses, charging only for production runtime license. This option is more attractive to novice developers who want to get started with J2EE application servers.
When the size of the project is large, many development teams will be involved, and development-licensing charges could be significant.Web Server Support
Quality of the HTTP Web server that comes bundled with the application server, and compliance and compatibility with other popular HTTP Web servers in the market is an important factor to be considered.Security Management
How secure are the transactions between the client and the server and across the tiers? What are the features of the product that specifically support this? What are the security standards supported by the product? Is there any security framework that is bundled with the application server?
These are all questions that should be asked to get an understanding of the security features supported by a given application server.Back-End Systems Integration
Application servers link different kinds of back-end resources: mainframes, relational databases, ERP, CRM, and other legacy systems. If there is any built-in support available within the application server for a given back-end environment, then it can save the cost and effort required for systems integration.Administration/Manageabiliy
Application servers should have user-friendly tools for day-to-day administration activities: resource monitoring, application health monitoring, deployment and replacement of components, and so on.
Although the quality and features supported by these tools vary widely, almost all of them have a visual console for performing basic operations. Most of them are empowered with remote administration capabilities so that system administrators need not be physically present in the server room.
One additional positive feature is the capability of the application server to escalate alerts, if any, to enterprise management tools, so that transactions are not adversely affected.Site Monitoring/Analysis and Reporting
Some application servers produce standardized weekly and monthly reports on the number of hits, resource usage, etc. These are most useful for statistical purposes and site performance reporting.Availability of Local Technical Support
Depending upon the technical expertise available within the enterprise, this feature also assumes importance. Expert advice that is available from visiting consultants and e-mail is not as good as having a strong local team to support the products. The emphasis is on the problem-solving capability of the local skill set.Pricing
Depending upon the budget and resources committed, pricing may become a constraint in adopting the right application server for the enterprise. For experimentation and proof-of-concepts, open source servers are better choices.
To provide the best performance and availability for WebSphere applications, administrators and developers count on scalability features found in the software, hardware, and networking components that host their WebSphere domain. More than ever, the availability of our Web applications can impact critical business processes.
Recognizing this, WebSphere technologists are implementing high-availability (HA) clusters using WebSphere Application Server Network Deployment Edition v5, hereafter referred to as ND. Along with HA functionality found in databases, Web servers, and operating systems, ND can be implemented to deliver the benefits of HA architecture: increased performance, failover, recovery, and workload management.
Let's now consider the Java applications hosted within WebSphere. Are they affected when the application servers that contain them are cloned? In the development life cycle, did you consider that your code might be deployed into a clustered WebSphere topology? For the servlet and JSP developer, this means that requests to servlets or JSPs might not be serviced by the same application server, even though the requests might all be for the same session.
In this article, I will examine HTTP session management strategies in clustered WebSphere environments from the perspectives of the administrator and the developer. I will make the case for implementing ND's framework for session management as an alternative to client-tier sessions, describing the tracking and persistence functionality that ND delivers.
Client-Tier Session ManagementThe HTTP session is implicitly stateless; this limitation must be considered when designing an HA solution. One way developers can overcome this limit is by storing the session at the client (browser) and delivering it as part of each server request.
There are several ways developers can store the session data at the client, including URL rewriting, cookies, and hidden HTML form elements. These are not to be confused with ND's session tracking mechanisms. The difference is that ND uses URL rewrites or cookies only to track the session ID. Storing the session in the client means sending all or most of the session data back and forth between the client and the server clone. Here are the major problems found with client-stored session data:
ND offers the alternative of server-managed sessions through affinity, tracking, and persistence mechanisms. This lets the developer take advantage of server-tier session management, with the added benefits of the HA infrastructure built into ND clusters. The rest of this article describes ND's support and functionality for server-tier session management.
ND Session AffinityThe conversation between a browser and a server clone can contain many exchanges. Since the browser initiates the conversation, the server clone that first services the request must be linked in some way to this new session so that subsequent requests can also be serviced by the same clone. Take, for example, the online shopping cart. As the user shops, items are added to the virtual shopping cart before checkout. This interaction could involve multiple HTTP exchanges. If items in the shopping cart are kept at the server clone, every one of those HTTP exchanges must be serviced by the same clone.
Uniquely identifying this browser-to-server relationship is what's known as session affinity. ND supports session affinity through the plug-in architecture, which defines the transport parameters between the Web server and the server clones. The plug-in parameters are built by the ND administrative server and stored in the plugin-cfg.xml file. When a server cluster is created, ND assigns each clone a unique identifier. Listing 1 shows what it looks like in the plugin-cfg.xml.
Since clone IDs are automatically assigned when the cluster is created, session affinity is enabled by default. The process of matching a session to a clone can impact performance, so if you don't need session affinity, disable it by removing the clone IDs from the plugin-cfg.xml. Also note that the plug-in will bypass session affinity if it doesn't detect session ID as part of the request. I'll discuss later how ND identifies the session and the options we have to track it.
The mechanics of session affinity are pretty straightforward, but it's worth noting that affinity guarantees only that requests for a single session are routed to the same clone. If the clone fails or is shut down, the plug-in will route the request to a different clone. If the alternate clone can't recover the session, then it is lost.
Using our shopping cart example, such a failure will result in an empty cart. To avoid this, ND has session persistence options that make the session recoverable in failover scenarios. But first let's cover session tracking functionality in ND to complete the affinity picture.
ND Session Tracking MechanismsIn addition to unique clone IDs, establishing affinity requires unique session IDs and an ability to track them in a multipart, browser-to-clone conversation. ND offers three options for tracking the session ID: SSL ID tracking, cookies, and URL rewriting. You can enable more than one tracking mechanism, and ND will resolve them in the following order: (1) SSL session IDs, (2) cookies, and (3) URL rewriting. A good reason to enable more than one mechanism is that each has deficiencies. If you decide to track sessions by SSL ID and the Web server fails, ND can fall back on an alternative tracking mechanism. The great part is that this functionality is built into ND, ready to go. Figure 1 shows ND's session tracking mechanisms.
An advantage of SSL tracking is that it doesn't require any code changes. The SSL ID is negotiated between the browser and the Web server, so even an application server failure won't change the session ID. Keep in mind that SSL IDs are affected by the Web server configuration (httpd.conf for Apache-style Web servers) and this may overlap with ND's session management controls. For example, session timeout is set by the SSLV3TIMEOUT parameter in the Web server, and is also set in ND's session management settings. Another possible conflict might occur if your code contains custom session invalidation routines. Be careful to verify each layer (Web server, app server, Web apps) to ensure one doesn't step on another.
As a tracking mechanism, cookies can be problematic. Many users block cookies out of concern for privacy. Some network administrators filter out cookies at the firewall. Still, beyond any privacy concerns, there are valid technical reasons for avoiding cookies. If cookies are permitted they can easily be manipulated at the client through browser controls or at the file system. Cookie files can be purged, expired, and changed manually. Any of these actions will cause loss of the session ID. If we don't trust cookies to hold session data, then we shouldn't trust cookies to hold the reference (session ID) to the session data either.
URL rewriting is fairly straightforward and involves appending the session ID to the end of a URL. There is a simple code requirement that the servlet or JSP must encode the URL for ND to properly recognize that a URL has a session attached to it.
The following code snippet shows the URL encoding in the servlet:
The following code snippet shows the URL encoding in the JSP:
A big advantage for URL rewriting is that it works everywhere. It also supports concurrent sessions for single users, but this could be troublesome if the user pastes the URL of an active session into a new browser instance. The server wouldn't know which browser instance was active. From a code perspective, especially for JSPs, URL rewriting can be awkward. Any page links in the JSP that need stateful session information would need their URLs rewritten. Also off-limits are any static HTML pages, because there's no way to insert the session ID.
The IBMSession InterfaceIt is quite common for Web applications to store session data at the server in a session object without persistence. This nonpersisted, local session exists only in JVM memory; if it is not persisted through ND, it is not made available outside this JVM and doesn't play a role in the HA infrastructure. Be careful not to confuse in-memory local sessions with ND's memory-to-memory replication. In-memory local sessions are limited to a single server (per the Servlet 2.3 specification), and don't offer recovery options after failover.
Servlet developers using local sessions store information through the HttpSession interface. The HttpSession is obtained through the HttpServletRequest, and is handled in the servlet's doGet() and doPost() methods. The HTTPSession methods to access and update the session include:
HttpSession hsess = req.getSession();Object o = hsess.getAttribute("sessAttributeName");hsess.setAttribute("sessAttributeName", sessObject);
The IBMSession interface extends the HTTPSession to add the following functionality: session overflow control, user identity association, and the ability for the developer to force a session to be persisted externally. While the first two fall under the umbrella of ND's session management offerings, it is the session persistence method that is important in a clustered topology. The developer has complete control of when the session gets persisted by calling the sync() method. This level of control is new in ND; previously the persistent store update was deferred until the end of the time interval specified in the session manager's write frequency settings, as shown in Figure 2.
Developers who store session data at the server can easily implement the IBMSession interface, and won't have much work left to achieve a server-tier session management system that supports failover. An added bonus is that very little, if any, code needs to change to implement persistent sessions with ND.
The WebSphere implementation, through the IBMSession interface, includes methods to access the extended functionality:
IBMSession isess = (IBMSession)req.getSession();if (isess.isOverFlow()) throw new ServletException ...String userName = isess.getUserName();isess.setAttribute("sessAttributeName", sessObject);isess.sync(); // persist externally
Now we can turn our attention toward what ND offers us for session persistence. We've already seen how the IBMSession interface allows the developer to choose exactly when the persistent store is updated, so let's look at the other way that persistent stores get updated, along with the details about ND's persistence mechanisms.
ND Session Persistence MechanismsTo briefly review, we've identified the session and the server (IDs), associated the two (affinity), and routed the request (plug-in). As we move on and discuss ND's session persistence functionality, keep in mind that ultimately it is the two persistence options that make failover recovery possible for the session.
Figure 3 shows the distributed environment settings in ND's administrative console. Here you can specify either database or memory-to-memory replication. Memory-to-memory replication is new in ND and uses WebSphere internal messaging.
Before the release of ND, database persistence was the only option available. The concept of persisting session objects to a database is fairly straightforward. Usually, when discussing this option, the first question asked is about performance. The general concern is that writing the objects out to a database is slow to begin with, and will collapse under any volume. While it's possible to overload even a very highly tuned system with enough volume, the real problem is the size of the session. When selecting database persistence, you must carefully consider page sizes (if using DB2) and whether to use a multirow schema. A single-row schema means one session object per row. A multirow schema means one session attribute per row. The trade-off is between performance and space in the database. The consensus best practice is to keep the session objects as small as possible and carefully analyze the average session size to determine database structure.
Memory-to-memory replication is a new alternative for persistence released in ND. One of the best reasons to consider this option is that it doesn't require a database. At first look, it might not be a big deal to create and manage a simple database for session persistence; however, the database needs to be part of a clustered solution to avoid a single point of failure.
There are three possible topologies: single replica, dedicated replication server, and peer-to-peer (default). The basic idea is that the session objects are "replicated" in memory between server clones, and the different topologies offer varying degrees of recovery. If a clone fails, the next request is routed through the plug-in, which then, depending on topology, can access a replicated copy of the session. The session size is even more important in memory-to-memory replication than in database persistence. A large session object combined with a high number of users can exhaust JVM heap memory quickly. The performance trade-off comes in the number of servers that participate in replication (based on the three available topologies).
Immediately after a session is persisted, it starts growing stale. Any session updates that happen after the last write won't be recovered in a failover scenario. We must decide between the performance trade-off of low update intervals and an acceptable level of session "freshness." Frequent updates (session synchronization) can hurt server performance. The best strategy is to find the right balance that still keeps your data fresh. In addition to the manual control through the IBMSession interface, you can choose a prepackaged tuning level that doesn't require any code change. The tuning choices are shown in Figure 4.
Since performance is an overriding factor in deciding on a persistence method, load testing is important and can help identify any weakness in an HA design before it is implemented. For many developers and administrators it is difficult to stage the entire HA implementation for testing and proof-of-concept purposes. There are some relatively inexpensive options, however, that can help you build a replica of your HA design. The ND environment described in this article was built using VMware's virtual machine software (www.vmware.com), allowing a single workstation to host software components (Web server, database, WebSphere) in separate virtual machines. To test performance and functionality, Apache's JMeter (http://jakarta.apache.org/jmeter/index.html) was used to simulate HTTP requests.
Developers can build use cases and test them against a planned HA configuration. For example, if you plan on implementing memory-to-memory replication using the default peer-to-peer topology, you might be concerned about the replicated sessions exhausting JVM memory. Such virtualized testing can help validate your choice of persistence methods. Developers can also simulate failover by shutting down server clones or even an entire virtual machine to observe recovery behavior.
ConclusionWebSphere Application Server ND supplies rich session management support in the areas of session tracking and persistence. Since the hardware, network, and software components on the server side of the topology are usually very reliable, it makes good sense to trust application-critical data, like session data, to the server tier. While this article focuses on the HA aspects of ND session management, it should be noted that there are other session-related controls in WebSphere 5 that we did not cover (check the referenced documents for more information). Developers and administrators are encouraged to take advantage of this functionality to build Web applications that meet the demand for application availability.
This is a very basic review of active and available open source Java EE Application servers and Servlet container (Web containers) to let the community know which active containers are available and what is the general status of each container. The article can simply act as a start point for anyone need to select one of them for later use in development or product. Detailed comparison of these production cover many pages of a tick book.
Full blown Open Source Java EE Application Servers:
Resin, a well known product from Caucho is an open source Java EE application server which has been around for quite a long time and many small and large deployment of it are serving small and large systems like DZone itself.
Current stable version of Resin is 3.1.9 which fully support Java EE 5 and the development version which will replace the current one is 4.0.1. Resin licensing schema is a bit different with other alternatives. They provide a GPL-ed version for open source distributer and evaluators while commercial usage requires paying Caucho some per/CPU - per/year fees. Different editions of Resin is available with a different set of features and capabilities and each edition has its own pricing schema. You can find more about the different versions and licensing fees at: Licensing
Resin come with Clustering, high availability support and benefits from an integrated caching system. Similar to GlassFish Resin support hosting PHP applications using Quercus.
For the administration and management, Resin took an alternate path by providing a light weight monitoring application to let administrators and developers see status of different services in the application server and left the the administrators to perform administrative and configuration tasks trough configuration files.
When it come to development tools support you can expect NetBeans, Eclipse and IntelliJ integration along with integration with Ant, Maven, and Ivy.
Geronimo: The Apache Java EE application server which is obviously distributed under ASF. Geronimo lacks behind GlassFish when it come to implementing new Java EE specification but it benefits from a good administration console compared to JBoss. Clustering is available trough 3rd party products like Terracotta and there is no out of the box support for clustering and high availability. Geronimo is well integrated with other apache projects like ServiceMix and ActiveMA. Current version of Geronimo is v2.1.4 and fully support Java EE 5 specification. Commercial support for Geronimo is available through IBM WebSphere Application Server Community Edition.
Two separate distribution of Geronimo is available, one with Jetty as web container and the other one with Tomcat as the web container. All Major IDEs support Geronimo as a development server.
GlassFish: Mainly developed by sun Microsystems and benefits from a modular, and extend-able architecture. GlassFish is in the front line of providing the community with new Java EE specification implementation and in the same time it provides all users with features like: advanced administration channels, out of the box clustering and high availability, OSGI runtime deployment and so on. Using Glassfish means that users can easily sign a contract and get support from Sun without need to change the deployment bits. current GlassFish stable version is GlassFish 2.1.1 and the next major version is GlassFish v3 which is a fully Java EE 6 compliant and OSGI based application server. The new version is due to be released on November this year. Open source GlassFish is accessible under CDDL and GPL licenses.
GlassFish benefits from integration with a wide set of Sun products starting from operating system (Solaris) up to the IDE (NetBeans). GlassFish ESB, Open Portal, OpenSSO and OpenMQ are some of the notable projects that GlassFish is well integrated with.
Another strength in GlassFish is integration with Sun HADB which can form a proven highly available infrastructure without spending any penny for the required software and licenses.
All Major IDEs support GlassFish as a development server and it means an easy start for developing Java EE applications using GlassFish.
JBoss: It was present in the open source community longer than other projects and benefits from Red hat support. JBoss Application server provides Clustering and high availability out of the box but the administration console which included in the distribution from version 5.1 is not advanced enough to let administrators manage the all application server resources . The included administration and management console is an embedded version of Jopr (http://www.jboss.org/jopr). This console will acts as a single point of administration and management for all JBoss technologies like ESB, cache et. Current version of JBoss is 5.1.0.GA and next upcoming version is 5.2. JBoss is distributed under LGPL and anyone interested can get commercial support from Red Hat. JBoss community distribution and enterprise distribution are two different package and and moving from community support to commercial support means installing an alternate version of Jboss named JBoss Enterprise Middleware.
JBoss application server benefits from integration with a wide range of middleware provided by JBoss. This products include caching, BPM, ESB, portal and so on. On the development side, it benefits from JBoss Developer Studio (not available for free) which is based on Eclipse and provide tooling for wide range of middlewares provided by Jboss.
All Major IDEs support JBoss as a development server and it means an easy start for developing applications on top of this application serverJOnAS is one the flagship projects in OW2 consortium and in contrast with having less buzz in the news and blogosphere it benefits from a profound modular architecture based on OSGI. JOnAS administration console is well designed and benefits from a slick user interface. Jonas benefits form integration with JASMINe for designing, deploying and administrating a clustered environment.
Current version of Jonas is 5.1 which fully support Java EE 5, the next planned version is 5.2 which is due to be released in Feb 2010 with basic support of Java EE and self management. Major IDEs like Eclipse and NetBeans support JOnAS as a development server. Jonas is distributed under LGPL
Jetty: Jetty is considered an alternative to Tomcat to some level. Because of the differences between these containers architecture each of them has its user base. Jetty is considered lighter, easier to embed and highly modular while Tomcat is considered more feature rich. Both projects benefit from a good performance under heavy load but it certainly can change from version to version and between different use cases. A cluster of jetty instances can be configured using any of Gigaspaces, WADI, Terracotta, etc. Jetty does not have a management console and everything should go through the configuration files by adding required changes to the configuration files. A good comparison between Tomcat and Jetty can be found at: http://www.webtide.com/choose/jetty.jsp
Note: before attempting to start Jetty add following line in the install_dir/bin/jetty.sh or jetty.bat depending on the OS.
For Windows:set JETTY_HOME=path/to/jetty/install/dir
For Linux, UNIX..:export JETTY_HOME=path/to/jetty/install/dir
Tomcat: Apache tomcat was around for past 10 years and it is the most widely used Servlet container. Many of the shared host providers provide Tomcat hosting for their customer while you can rarely find GlassFish, Geronimo, JBoss and JOnAS hosting in the Internet. Apache Tomcat is distributed under Apache License and its current version (6.0.20) supports Servlet 2.5 and JSP 2.1. Apache Tomcat comes with a bundled management console which provides administrators with very basic configuration capabilities. Most administration and management tasks should be done by editing the configuration files. Tomcat is supported by any known IDE and build/ deployment tools and it shows it popularity in the community. Tomcat come with built-in clustering and session replication support.
Note: before starting tomcat add following line in the install_dir/conf/tomcat-users.xml inside the tomcat-users node:<user username="tomcat" password="tomcat" roles="manager"/>
Conclusion: None of this projects can fit all development and deployment plans and requirement. Each of them has its strenghts and weak points compared to other 5 competitive projects. What one need to do is testing all of them and decide which one is better.
Blog: http://weblogs.java.net/blog/kalali/Contact: Kalali@gmail.com
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Vmware [58 Certification Exam(s) ]
Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]
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