WebLogic Interview Questions With Answers

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1. What is the default database for WL server?

Ans:  Point base is the default database for WLS. It comes with Weblogic software package. But, we can apply any database oracle, DB2, point base etc…

2.  Explain the function of T3 in WebLogic Server?

Ans: T3 provides a framework for WebLogic Server messages that support for development. These developments include abbreviations and features, such as object substitute, that work in the context of WebLogic Server clusters and HTTP and other product subway. T3 predates Java Object Serialization and RMI, while closely tracking and leveraging these conditions. T3 is command between WebLogic Servers and between programmatic customers and a WebLogic Server group. HTTP and IIOP are optional protocols that can be used to communicate between other processes and WebLogic Server.   

3.  Explain the difference between admin and managed server?

Ans: There is no difference between Admin and Managed server except admin interface application by default arrange on admin server which is used to construct the domain resources. Apart from that an admin server is same as a managed server; you can arrange and create other relative resources on admin server also as you do on managed server.

4.  Define JNDI?

Ans: JNDI stands for Java Naming and Directory Interface.  JNDI provides a common-denominator interface to many existing naming services, such as LDAP (Lightweight Directory Access Protocol) and DNS (Domain Name System). These naming services maintain a set of bindings, which relate names to objects and provide the ability to look up objects by name. JNDI allows the components in distributed applications to locate each other.

5.  How stubs work in a WebLogic Server cluster? 

Ans: The enrichment support for WebLogic Server messages is provided by T3. These enhancements include object replacement, which work in WebLogic Server clusters context and HTTP.

6.  Define cross-cluster replication?

Ans: It is the ability provided by WL to replicate HTTP sessions across two clusters in separate domains.

7.  What are Weblogic clusters?

Ans: A WebLogic Server cluster consists of multiple WebLogic Server server instances running at the same time and working together to provide increased scalability and consistency. A cluster appears to clients to be a single WebLogic Server instance. The server instances that constitute a cluster can run on the same machine, or be positioned on different machines. 

8.  What are deployment descriptors?

Ans: Modules and applications have deployment descriptors—XML documents—that explain the contents of the directory or JAR file. Deployment descriptors are text documents formatted with XML tags. 

9.  What are the capabilities of WebLogic Server?

Ans: capabilities of Web Logic server:

• Dynamic configuration changes
• Production application redeployment
• Rolling upgrades

10. What are the Admin Default ports?

Ans: The non-SSL listen port for the Administration Server's default network configuration is 7001 by default. The SSL listen port for the Administration Server's default network configuration is 7002 by default. WebLogic Admin servers and Managed servers could communicate with Admin port which is part network channel. So that other communications can be run on dissimilar networks.