In-memory HTTP session replication is the core clustering feature that enables high availability for web applications. It replicates session data from a primary server to a secondary server within the cluster. If the primary server fails, the secondary can take over, and the client’s session state is preserved, allowing the request to be completed without the user losing data or being logged out.

The WebLogic Administration Console provides a comprehensive Monitoring Dashboard. You can navigate to the specific EJB component (e.g., under Deployments > [Your EJB]), where you can view real-time and historical performance metrics. This GUI is designed for this exact administrative task, offering immediate insight into invocation counts, pool usage, cache hits/misses, and execution times without needing to write scripts.

The SSL Listen Port and Enabled configuration for any server, including the Administration Server, is located in the server-specific configuration. You navigate to Environment > Servers, click on the Administration Server instance, go to the Configuration > General tab. Here, you can set ‘SSL Listen Port’ and ensure ‘SSL Enabled’ is checked. Crucially, you would also set the plain ‘Listen Port’ to be disabled to force all traffic to use SSL.

The ‘Messages Maximum’ quota parameter on a JMS destination (queue or topic) defines the maximum number of messages that can be held in memory. Once this threshold is reached, subsequent messages are paged to disk (if paging is enabled) or producers may be blocked. Adjusting this setting is a direct way to manage memory pressure from a growing queue, allowing you to trade off memory usage for disk I/O.

The WebLogic Scripting Tool (WLST) is a command-line scripting interface built on Jython. It is the primary tool for automating WebLogic administration tasks, including deployments, configuration changes, and server lifecycle operations. WLST scripts can be called from shell scripts or CI/CD tools like Jenkins, providing a reliable and auditable method for deployment automation.

Node Manager is a separate, standalone utility that runs on the same physical machine as its Managed Servers. Its key function is to control the lifecycle (start, stop, restart, monitor) of Managed Server instances. When configured for automatic restart, Node Manager will restart the Managed Server process if it terminates unexpectedly or after a machine reboot, provided the Administration Server is reachable.

A JDBC Data Source is a WebLogic Server object that provides database connectivity through a connection pool. Applications look up the Data Source via JNDI and borrow connections from the pool, rather than creating and destroying them for each request. This dramatically improves performance by eliminating the overhead of establishing a new database connection every time. The pool settings (initial/maximum capacity, test queries) are key to diagnosing connection-related performance issues.

JDBC-based persistence stores HTTP session data directly into a shared database table. This is the recommended method for cross-data center or wide-area network (WAN) replication because it uses a durable, centralized store accessible by both clusters. While synchronous database writes are slower than in-memory replication, they offer the strongest guarantee that no session data will be lost during a full site failure, as the database itself can be part of the DR strategy.

An Audit Provider is a specialized security provider whose sole function is to record security events. You can configure it to capture events such as authentication success/failure, authorization checks, and realm changes. These audit records are written to a configured handler (like the server log file or a database table), creating the necessary trail for compliance and forensic analysis.

In-memory HTTP session replication is the core clustering feature that enables high availability for web applications. It replicates session data from a primary server to a secondary server within the cluster. If the primary server fails, the secondary can take over, and the client’s session state is preserved, allowing the request to be completed without the user losing data or being logged out.0