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EJB --> Monitoring --> Stateful EJBs

Tasks     Related Topics

Overview

The runtime information collected for a stateful session EJB is substantial and can be very useful for tuning and debugging the EJB. This console screen displays a variety of statistics about the state and performance of stateful session EJBs. The statistics are discussed in the following sections:

• Cache Access Count
• Cache Hit Count
• Lock Manager Entries Current Count
• Lock Manager Access Count
• Lock Manager Waiter Total Count
• Lock Manager Timeout Total Count

Cache Access Count

Displays the total number of attempts to access a bean from the cache. This information is useful for giving context to other counts such as cache hits.

Cache Hit Count

Displays the total number of times an attempt to access a bean from the cache succeeded. This information is useful for determining the effectiveness of the EJB cache.

Lock Manager Entries Current Count

Displays the current number of lock entries in the lock manager. This information can be helpful in detecting stale lock entries.

Lock Manager Access Count

Displays the total number of attempts to obtain a lock on a bean. This includes attempts to obtain a lock on a bean that is already locked on behalf of the client. This information is useful for giving context to the waiter and timeout total counts.

Lock Manager Waiter Total Count

Displays the total number of threads that have waited for a lock on a bean. This information is useful for calculating the lock waiter ratio.

Lock Manager Timeout Total Count

Displays the total number of threads that have timed out waiting for a lock on a bean. This information is useful for calculating the lock timeout ratio.

Tasks

Monitoring Stateful Session EJBs

Related Topics

EJB Runtime Monitoring