Most frequently asked Oracle WebLogic Interview Questions

1. What Is Weblogic?
2. Name the basic components of a WebLogic server?
3. What is T3 in WebLogic Server?
4. What is web.xml?
5. Explain WebLogic server?
6. How does weblogic clustering work?
7. What types of objects can be Clustered?
8. Installation Modes suppoerted by Weblogic Server?
9. List the different ways to configure a Managed server in the WebLogic server?
10. What is Node Manager?
11. How to set order of jars in WebLogic?
12. How you deploy your applications on Weblogic Server?

What Is Weblogic?

WebLogic is a platform for developing and deploying distributed enterprise applications, it centralizes application services like Web server functionality, business components, etc systems.It also allows the application for accessing services like database, messaging, or other systems.
WebLogic is a J2EE server and also HTTP web server by oracle.

Name the basic components of a WebLogic server?

Basic components of WebLogic server are:

• Domains
• Node Manager
• Admin server
• Managed server
• WebLogic server cluster

What is T3 in WebLogic Server?

T3 is a framework that supports enhancements, it includes abbreviations and features like object replacement.It is a superset of Java Objects.
T3 helps in transporting information between WebLogic servers and other types of Java programs.It also keeps track of every Java virtual machine that is connected to the application.

What is web.xml?

Web. xml is mainly used for application and helps in listing out the J2EE components and configuration of J2EE modules format.It helps in mapping between URL paths and the servelets that handles requests with paths.

Explain WebLogic server?

This server helps in supporting various services as well as infrastructure which are related to the applications.It also deploys components as well as well as application through UDDI, SOAP, etc.
WebLogic got various capabilities like:
Changes in dynamic configuration.
Production application redeployment.
Rolling upgrades.

How does weblogic clustering work?

Weblogic clustering helps with weblogic server instances running simultaneously and working for providing increased scalability and reliability, it appears to clients to be a single weblogic server instance.We can increase the clusters capacity by adding server instance to the cluster on the machine and can add machines to the cluster to host the incremental server instance.

What types of objects can be Clustered?

Clustered application is available on multiple weblogic server instances in a cluster.
Types of objects that can be clustered are:

• Servlets
• JSPs
• EJBs
• Remote Method Invocation (RMI) objects
• Java Messaging Service (JMS) destinations
• Java Database Connectivity (JDBC) connections

Installation Modes suppoerted by Weblogic Server?

Modes suppoerted by Weblogic are:
Graphical mode
Console mode
Silent mode

List the different ways to configure a Managed server in the WebLogic server?

There are 3 different ways to configure a managed server in WebLogic server are:
WebLogic scripting tool
Administration Console
Domain Configuration wizard

What is Node Manager?

Node manager is a utility which enables us to start, shut down and restart administration server and managed instances from a remote location.A single node manager instance is used for controlling all of the server instance running on physical or different machine.
We must configure each machine in our domain to communicate with Node Manager.

How to set order of jars in WebLogic?

We can order the set of jars by using the following code:

<prefer-application-packages>
    <package-name>org.apache.*</package-name>
    <package-name>antlr.*</package-name>
</prefer-application-packages>

How you deploy your applications on Weblogic Server?

There are 3 ways to deploy our applications on WebLogic Server are:
Auto Deployment
Console
Command line
ANT / WLST