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Weblogic Interview Questions & Answers - Learning Mode
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Weblogic Interview Questions & Answers - Learning Mode

WebLogic is a leading e-commerce online transaction processing (OLTP) platform, developed to connect users in a distributed computing environment and to facilitate the integration of mainframe applications with distributed corporate data and applications. WebLogic Server contains Java 2 Platform, Enterprise Edition (J2EE) technologies. J2EE is the standard platform for developing multitier enterprise applications based on the Java programming language.

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BEA Weblogic Interview Questions & Answers (182) Learning Mode | Exam Mode

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Weblogic Interview Questions & Answers - Learning Mode
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Question: How do I increase WebLogic Server memory?

Answer: Increase the allocation of Java heap memory for WebLogic Server. (Set the minimum and the maximum to the same size.) Start WebLogic Server with the -ms32m option to increase the allocation, as in this example:

$ java ... -ms32m -mx32m ...

This allocates 32 megabytes of Java heap memory to WebLogic Server, which improves performance and allows WebLogic Server to handle more simultaneous connections. You can increase this value if necessary. Source: CoolInterview.com
Question: What is the function of T3 in WebLogic Server?

Answer: 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 Source: CoolInterview.com
Question: How can I set deployment order for applications?

Answer: WebLogic Server allows you to select the load order for applications. WebLogic Server deploys server-level resources (first JDBC and then JMS) before deploying applications. Applications are deployed in this order: connectors, then EJBs, then Web Applications. If the application is an EAR, the individual components are loaded in the order in which they are declared in the application.xml deployment descriptor.
Source: CoolInterview.com
Question: Components of JNDI?

Answer: Naming Interface- The naming interface organizes information hierarchically and maps human-friendly names to addresses or objects that are machine-friendly. It allows access to named objects through multiple namespaces. Directory Interface - JNDI includes a directory service interface that provides access to directory objects, which can contain attributes, thereby providing attribute-based searching and schema support. Service Provider Interface - JNDI comes with the SPI, which supports the prot Source: CoolInterview.com
Question: JNDI Usage for weblogic?

Answer: Java Naming and Directory Interface it is a API.
The Weblogic Server Uses This For storing te Different
objects(Like Connection factories, Datasourc....). These
Objects Retrived from JNDI tree when they are want to be
Used. Source: CoolInterview.com
Question: JNDI Usage for weblogic?

Answer: JNDI(java naming directory interface)
the name it self shows that it is a interface for creating
name directorys.this jndi useful for know thw location of
objects.
coming to weblogic each server have one jndi as well as
wech cluster has cluster wide jndi.this very much useful
for finding the objects and moniter the objects&avoid the
nameconflict . Source: CoolInterview.com
Question: How do stubs work in a WebLogic Server cluster?

Answer: 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.

What happens when a failure occurs and the stub cannot connect to a WebLogic Server instance?
When the failure occurs, the stub removes the failed server instance from Source: CoolInterview.com
Question: What happens when a failure occurs and the stub cannot connect to a WebLogic Server instance?

Answer: When the failure occurs, the stub removes the failed server instance from its list. If there are no servers left in its list, the stubb uses DNS again to find a running server and obtain a current list of running instances. Also, the stub periodically refreshes its list of available server instances in the cluster; this allows the stub to take advantage of new servers as they are added to the cluster.
Source: CoolInterview.com
Question: What happens if remove( ) is never invoked on a session bean?

Answer: In case of a stateless session bean it may not matter if we call or not as in both cases nothing is done. The number of beans in cache is managed by the container. In case of stateful session bean, the bean may be kept in cache till either the session times out, in which case the bean is removed or when there is a requirement for memory in which case the data is cached and the bean is sent to free pool. Source: CoolInterview.com
Question: How do clients handle DNS requests to failed servers?

Answer: If a server fails and DNS continues to send requests to the unavailable machine, this can waste bandwidth. For a Java client application, this problem occurs only during startup. WebLogic Server caches the DNS entries and removes the unavailable ones, to prevent the client from accessing a failed server twice.

Failed servers can be more of a problem for browser-based clients, because they always use DNS. To avoid unnecessary DNS requests with browser-based clients, use a third-party load- Source: CoolInterview.com
Question: Do EJBs have to be homogeneously deployed across a cluster? Why?

Answer: Yes. Beginning with WebLogic Server version 6.0, EJBs must be homogeneously deployed across a cluster for the following reasons:

* To keep clustering EJBs simple
* To avoid cross server calls which results in more efficiency. If EJBs are not deployed on all servers, cross server calls are much more likely.
* To ensure that every EJB is available locally
* To ensure that all classes are loaded in an undeployable way
* Every server must have access to each EJ Source: CoolInterview.com
Question: Can I start a Managed Server if the Administration Server is unavailable?

Answer: By default, if a Managed Server is unable to connect to the specified Administration Server during startup, it can retrieve its configuration by reading a configuration file and other files directly. You cannot change the server's configuration until the Administration Server is available. A Managed Server that starts in this way is running in Managed Server Independence mode. Source: CoolInterview.com
Question: How do stubs work in a WebLogic Server cluster?

Answer: 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.

What happens when a failure occurs and the stub cannot connect to a WebLogic Server instance?
When the failure occurs, the stub removes the failed server instance from Source: CoolInterview.com
Question: What is the Java Authentication and Authorization Service (JAAS) 1.0?

Answer: Java Authentication and Authorization Service (JAAS) provides a way for a J2EE application to authenticate and authorize a specific user or group of users to run it. JAAS is a Java programing language version of the standard Pluggable Authentication Module (PAM) framework that extends the Java 2 platform security architecture to support user-based authorization. Source: CoolInterview.com
Question: How can I set deployment order for applications?

Answer: WebLogic Server allows you to select the load order for applications. WebLogic Server deploys server-level resources (first JDBC and then JMS) before deploying applications. Applications are deployed in this order: connectors, then EJBs, then Web Applications. If the application is an EAR, the individual components are loaded in the order in which they are declared in the application.xml deployment descriptor. Source: CoolInterview.com
Question: How do I increase WebLogic Server memory?

Answer: Increase the allocation of Java heap memory for WebLogic Server. (Set the minimum and the maximum to the same size.) Start WebLogic Server with the -ms32m option to increase the allocation, as in this example:

$ java ... -ms32m -mx32m ...

This allocates 32 megabytes of Java heap memory to WebLogic Server, which improves performance and allows WebLogic Server to handle more simultaneous connections. You can increase this value if necessary. Source: CoolInterview.com
Question: What causes Java.io exceptions in the log file of WebLogic Server?

Answer: You may see messages like these in the log file:

(Windows NT)
java.io.IOException Connection Reset by Peer
java.io.EOFException Connection Reset by Peer
(Solaris)
java.io.Exception: Broken pipe

These messages occur when you are using servlets. A client initiates an HTTP request, and then performs a series of actions on the browser:

* Click Stop or enter equivalent command or keystrokes
* Click Refresh or enter equivalent command or keystrokes
Source: CoolInterview.com
Question: What is the function of T3 in WebLogic Server?

Answer: 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 Source: CoolInterview.com
Question: What are the two important TCP Socket classes?

Answer: ServerSocket is used for normal two-way socket communication. Socket class allows us to read and write through the sockets. getInputStream() and getOutputStream() are the two methods available in Socket class. Source: CoolInterview.com
Question: Is an XSLT processor bundled in WebLogic Server?

Answer: Yes, an XSLT processor, based on Apache?s Xalan 2.0.1 processor, in WebLogic Server 6.1. Source: CoolInterview.com

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