IBM WAS Interview Questions

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IBM WebSphere Application Server Interview Questions

1. What is IBM WAS?

IBM WAS - IBM WebSphere Application Server.
A software framework to act as a web application server that enables to host java based applications.

Related Article: IBM Websphere Tutorial

2. What is the use of WebSphere?

WebSphere refers to “Application and Integration Middleware”. It helps to create and manage professional/large business application websites. With regard to IBM WAS, it acts as server integration with middleware connecting java applications with websites.

3. What is the latest version of Websphere available.

Websphere 8.5.5

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4. What are the main components of WebSphere.

• WebSphere Application Server(WAS)
• Data Server
• Web Server

5. List a few platforms that are supported by IBM WAS.

• Solaris
• Linux
• Windows
• IBM I (Integrated OS with robust architecture)
• z/OS(A 64 bit OS by IBM)
• AIX(Advanced Interactive eXecutive by IBM)

Above mentioned are some of the platforms supported by IBM WAS.

6. What are the WAS editions available?

WAS editions available:

• Liberty Core - WAS
• Express - WAS
• Base - WAS
• Network Deployment - WAS
• Hypervisor Edition - WAS
• z/OS - WAS

And WebSphere Application for Developers edition as well.

7. What are WebSphere Topologies?

• Standalone
• Network Deployment
• Administrative Agents are the three topologies available.

8. Explain the standalone topology of WAS.

Installing Websphere in the single server along with cell, node and JVM is a Stand-alone topology. Where one cannot have any admin console to manage the server. JVM itself handles all the necessary actions to be performed with the Server.

9. What is network deployment topology.

Network Deployment topology happened to be the most widely used topology as it has advanced features and provides ease of accessing multiple JVMs if installed more than one. This is supported by WAS Network Deployment Edition.

10. What is Administrative agent topology.

The administrative process is an additional process that is executed along with node, cell, and JVM, and this administrative agent can manage all the registered nodes under the agent. When more than one stand-alone servers need to be administered providing access to JCM actions using the console, Administrative agent topology is used.

11. Server can listen to multiple ports? True or False. Explain.

True. The server can listen to multiple ports when the applications are installed in a single server and the ports are mentioned in the virtual server while deploying.

12. What is a web container?

Web Container is used to allocate servlet to process the request received from the client application. The dynamic class loader is used to load this servlet.

13. What are FFDC logs?

“First Failure Data Capture” is used to store log information in order to make IBM easy while preparing PMR(Project Management Report).

14. What are the different templates available to create a profile?

WAS V7 Profiles are:

• secure proxy
• managed
• dmgr
• management
• cell
• Default

15. Common errors while profiling creation.

Trying to include special characters in the hostname is the most common error.

16. How an application server can be administered?

Using admin console or wsadmin.

17. What is wsadmin?

wsadmin is a tool, helps you with an interactive prompt to work with administration commands to manage admin activities, or wsadmin objects.

18. What happens when the application server is installed for the second time in the same target location?

Unattended Installation of the application server is expected, creating the problem.

19. What is Weblogic?

Weblogic is also an application server by Oracle, developed for Java 2EE applications. Used to build large multi-tier enterprise applications that are written in Java. Weblogic server provides a java platform with J2EE technologies to develop applications.

20. Differentiate WebSphere with Weblogic.

The key difference is WebSphere is not provided with any transactional attributes, whereas WebLogic supports default transaction attributes.

Websphere helps more in integrating web services and reliable connections among server clients, and WebLogic concentrates more on improving J2EE standards thus keeps in line with the latest updates from Java.

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21. What is a cell in WebSphere?

Group of nodes refers to a cell that helps WebSphere to administer activities that are associated with distribute web servers.

22. What is a connection pool?

Connection pooling is the process of caching used database connections without closing, in order to reuse connections to serve requests followed. When all the connections in the pool are under processing, and the new request is made, then a new database connection is created and served.