1. What is WebLogic Server?
WebLogic Server is a Java EE application server that enables the deployment, integration, and management of Java applications.

2. What are the different components of a WebLogic domain?
The components of a WebLogic domain are Admin Server, Managed Servers, Node Manager, and WebLogic JDBC Data Sources.

3. What is a WebLogic Managed Server?
A WebLogic Managed Server is a server that hosts applications and is configured and managed by the Domain Administration Server.

4. What is the Admin Server in WebLogic?
The Admin Server in WebLogic is the central server that manages and coordinates all other servers and resources within the domain.

5. What is a WebLogic Cluster?
A WebLogic Cluster is a group of managed servers that work together to provide scalability, high availability, and failover support for applications.

6. How can you start and stop a WebLogic server?
You can start and stop a WebLogic server using the startWebLogic.sh (or .cmd) and stopWebLogic.sh (or .cmd) scripts, respectively.

7. What is the WebLogic Node Manager?
The WebLogic Node Manager is a Java utility that allows you to control and manage the startup and shutdown of servers within a WebLogic domain.

8. What is the purpose of the WebLogic Administration Console?
The WebLogic Administration Console is a web-based interface used for configuring, managing, and monitoring WebLogic servers and domains.

9. How can you deploy an application in WebLogic?
You can deploy an application in WebLogic by using the WebLogic Administration Console, WLST (WebLogic Scripting Tool), or by using the command-line utility ‘weblogic.Deployer’.

10. What is a WebLogic JDBC Data Source?
A WebLogic JDBC Data Source is a connection pool that provides connections to a database for use by applications deployed on a WebLogic Server.

11. What is the difference between WebLogic Server and Apache Tomcat?
WebLogic Server is a full-fledged Java EE application server, whereas Apache Tomcat is a simpler servlet container with limited Java EE functionality.

12. What is the purpose of a WebLogic Deployment Descriptor (weblogic.xml)?
A WebLogic Deployment Descriptor (weblogic.xml) is an XML file used to define application-specific configuration and deployment settings for WebLogic Server.

13. How can you monitor performance in WebLogic?
You can monitor performance in WebLogic using the WebLogic Administration Console, which provides real-time monitoring and performance metrics for various server resources.

14. What is the WebLogic JMS (Java Message Service)?
WebLogic JMS is a messaging system that enables asynchronous communication between Java applications using the publish-subscribe model or the point-to-point model.

15. What is the purpose of WebLogic Security Realms?
WebLogic Security Realms provide a way to authenticate users and control access to resources within a WebLogic domain, allowing for secure application deployment.

16. What is WebLogic Work Manager?
WebLogic Work Manager is a subsystem that enables you to define and manage thread pools for executing work in a controlled manner, improving application performance and resource utilization.

17. How can you enable SSL in WebLogic?
You can enable SSL in WebLogic by configuring SSL certificates, keystores, and truststores in the WebLogic Administration Console, and associating them with SSL-enabled components.

18. What is the purpose of a WebLogic Proxy Plugin?
A WebLogic Proxy Plugin is used to integrate WebLogic Server with web servers like Apache HTTP Server or Microsoft IIS, enabling load balancing and improved performance.

19. What is the difference between WebLogic Server Basic and WebLogic Server Enterprise Edition?
WebLogic Server Basic Edition is a lightweight edition designed for development and small deployments, while WebLogic Server Enterprise Edition provides additional features for large-scale enterprise applications.

20. How can you configure high availability in WebLogic?
You can configure high availability in WebLogic by using features like clustering, session replication, and distributed caching, which ensure application availability and failover support.

1. What is WebLogic Server and its features?
WebLogic Server is a Java EE application server that provides a platform for developing, deploying, and managing distributed applications. Its features include support for clustering, load balancing, high availability, security, transaction management, and scalability.

2. What is the difference between WebLogic Server and Apache Tomcat?
WebLogic Server is a full-fledged Java EE application server that supports a wide range of Java EE technologies and provides enterprise-level features, whereas Apache Tomcat is a lightweight servlet container that only supports the Servlet and JavaServer Pages (JSP) technologies.

3. How can you configure SSL in WebLogic Server?
SSL can be configured in WebLogic Server by creating a Keystore and configuring the SSL protocols and cipher suites in the server configuration. The Keystore contains the server’s private key and the signed certificate from a Certificate Authority (CA).

4. Explain WebLogic JMS (Java Message Service) and its key components.
WebLogic JMS is a messaging system that allows application components to communicate using asynchronous messaging. Its key components include JMS destinations (queues and topics), JMS producers (to send messages), JMS consumers (to receive messages), and JMS connection factories (to create JMS connections).

5. How can you enable HTTP session replication in WebLogic Server?
HTTP session replication can be enabled in WebLogic Server by configuring a distributed session store in the server configuration. The distributed session store can be a JDBC-based store, file-based store, or a Coherence-based store.

6. What is a WebLogic JDBC data source?
A WebLogic JDBC data source is a way to create a connection pool to a database. It provides a scalable and efficient way to manage connections to the database and allows applications to use the connection pool instead of creating and closing connections directly.

7. What is the difference between WebLogic Server domain and a server instance?
A WebLogic Server domain is a logically related group of WebLogic Server instances (servers) that share the same configuration, applications, and resources. A server instance is a single running instance of WebLogic Server within a domain.

8. How can you set up high availability in WebLogic Server?
High availability can be achieved in WebLogic Server by configuring clustering and load balancing. Clustering allows multiple server instances to work together as a single system, and load balancing distributes the incoming requests across the clustered servers to ensure better performance and fault tolerance.

9. What is Node Manager in WebLogic Server?
Node Manager is a WebLogic Server utility that allows administrators to start, shut down, and restart server instances remotely. It runs as a separate process outside the server instances and provides a centralized management interface for server administration.

10. Explain the difference between stateless and stateful session beans in WebLogic Server.
Stateless session beans in WebLogic Server do not maintain conversational state between client requests, whereas stateful session beans maintain conversational state between client requests. Stateful session beans are associated with a specific client and retain their state until explicitly removed or a timeout occurs.

11. How can you monitor and manage WebLogic Server?
WebLogic Server provides various tools and mechanisms for monitoring and managing server instances. Some of the commonly used tools include the WebLogic Server Administration Console, WLST (WebLogic Scripting Tool), JMX (Java Management Extensions), and third-party monitoring tools.

12. What is a WebLogic Server cluster?
A WebLogic Server cluster is a group of multiple server instances (nodes) that work together as a single system. Clustering provides scalability, high availability, and load balancing for applications deployed on the cluster.

13. How can you configure WebLogic Server for SSL communication?
WebLogic Server can be configured for SSL communication by generating or obtaining a server certificate, configuring SSL protocols and cipher suites, and configuring SSL-enabled listen ports in the server configuration.

14. Explain the different modes of deploying applications in WebLogic Server.
WebLogic Server supports various modes of deploying applications, including standalone mode, exploded mode, archived mode (EAR file), and shared libraries mode. Each mode has its own advantages and is suitable for different deployment scenarios.

15. What is WebLogic Server’s security realm and how can you configure it?
A security realm in WebLogic Server defines a set of users, groups, roles, and security policies. It is used for authentication, authorization, and identity management. The security realm can be configured using the WebLogic Server Administration Console or through the weblogic.xml file.

16. How can you enable JMS messaging in WebLogic Server?
JMS messaging can be enabled in WebLogic Server by configuring JMS resources such as JMS connection factories, JMS destinations (queues/topics), and JMS servers. These resources can be configured through the WebLogic Server Administration Console or through deployment descriptors.

17. What is a WebLogic Server deployment descriptor?
A WebLogic Server deployment descriptor is an XML file that provides configuration information for a specific application or module. It contains deployment-specific settings such as resource references, security settings, transaction settings, and other configuration parameters.

18. How can you configure WebLogic Server for load balancing?
WebLogic Server can be configured for load balancing by creating a cluster, configuring session affinity (sticky sessions), and configuring the load balancing algorithm (round-robin, weighted round-robin, etc.) for the cluster. Load balancing can also be achieved using a separate load balancer in front of the WebLogic Server cluster.

19. What is the WebLogic Server Administration Console?
The WebLogic Server Administration Console is a web-based GUI tool that allows administrators to manage and monitor WebLogic Server instances. It provides a user-friendly interface for configuring server settings, deploying applications, managing resources, and monitoring server performance.

20. How can you configure WebLogic Server for high availability and failover?
WebLogic Server can be configured for high availability and failover by setting up a cluster, configuring session replication, enabling automatic migration of failed server instances, and configuring the appropriate failover and failback settings for resources such as JDBC data sources.