Weblogic Server Interview Question and Answers
A) WebLogic is a J2EE application server and also an HTTP web server by Oracle Systems of San Jose, California, for Unix, Linux, Microsoft Windows, and other platforms. WebLogic supports Oracle, DB2, Microsoft SQL Server, and other JDBC-compliant databases. WebLogic Server supports WS-Security and is compliant with J2EE.
2) How do stubs work in a WebLogic Server cluster?
A) Clients that connect to a WebLogic Server cluster and look up a clustered object obtain a replica-aware stub for the object. This stub contains the list of available server instances that host implementations of the object. The stub also contains the load balancing logic for distributing the load among its host servers.
3) Must my bean managed persistence mechanism use the WebLogic JTS driver?
A) Use the TxDataSource for bean-managed persistence.
4) How do I use multibyte character sets with WebLogic jDriver for Informix?
A) Currently, multibyte character sets are not supported for the WebLogic jDriver for Informix driver.
5) What is the difference between weblogic and websphere?
A) Though the functionality of these two products are closer, there are minor differences in the standards that support. These differences are:
- WebSphere’s focus is more on connectivity, integration and web services where as WebLogic’s focus is more on emerging standards and ease-of-use of J2EE.
- WebSphere’s performance is better in terms of implementations of J2EE is little more involved, and supports more integration and transaction management to a great extent.
- WebLogic is supported by default transaction attribute “Supports”, where as WebSphere has not default transaction attribute.
- WebSphere strictly follows J2EE architecture.
6) How do I limit the number of Oracle database connections generated by WebLogic Server?
A) You can use connection pools to limit the number of Oracle database connections generated by WebLogic Server in response to client requests. Connection pools allow T3 applications to share a fixed number of database connections.
7) What is the default log Message Severity levels in Weblogic?
A) WebLogic Server subsystems generate many messages of lower severity and fewer messages of higher severity. For example, under normal circumstances, they generate many INFO messages and no EMERGENCY messages.
8) What is the Log Message Severity Level sequence from lowest to highest impact?
A) A log level object can specify any of the following values, from lowest to highest impact:
TRACE, DEBUG, INFO, NOTICE, WARNING, ERROR, CRITICAL, ALERT, EMERGENCY
9) What are the elements of the Administration console?
A) Change Center
How do I…
10) What is the function of T3 in WebLogic Server?
A) T3 provides a framework for WebLogic Server messages that support for enhancements. These enhancements include abbreviations and features, such as object replacement, that work in the context of WebLogic Server clusters and HTTP and other product tunneling. T3 predates Java Object Serialization and RMI, while closely tracking and leveraging these specifications. T3 is a superset of Java Object. Serialization or RMI; anything you can do in Java Object Serialization and RMI can be done over T3. T3 is mandated between WebLogic Servers and between programmatic clients and a WebLogic Server cluster. HTTP and IIOP are optional protocols that can be used to communicate between other processes and WebLogic Server. It depends on what you want to do. For example, when you want to communicate between a browser and WebLogic Server-use HTTP, or an ORB and WebLogic Server-IIOP.