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EJB --> Monitoring --> Stateless EJBs

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Overview

The runtime information collected for a stateless 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 stateless session EJBs. The statistics are discussed in the following sections:

• Pooled Beans Current Count
• Beans In Use Current Count
• Waiter Current Count
• Pool Timeout Total Count
• Access Total Count
• Miss Total Count

Pooled Beans Current Count

Displays the current number of available bean instances in the free pool. This information is useful for tracking demand for your EJB. For example, this can be important when investigating an abnormal pool miss ratio.

Beans In Use Current Count

Displays the number of bean instances currently in use from the free pool. This information is useful for tracking demand for your EJB. For example, this can be important when investigating an abnormal pool miss ratio.

Waiter Current Count

Displays the number of threads currently waiting for an available bean instance from the free pool. This information may be useful, for example, for investigating the cause of poor application performance at a particular time.

Pool Timeout Total Count

Displays the total number of threads that have timed out waiting for an available bean instance from the free pool. This information is useful for calculating the pool timeout ratio.

Access Total Count

Displays the total number of times an attempt was made to get an instance from the free pool. This information is useful for giving context to the other free pool counts.

Miss Total Count

Displays the total number of times a failed attempt was made to get an instance from the free pool. An attempt to get a bean from the pool will fail if there are no available instances in the pool. This information is useful for calculating the pool miss ratio.

Tasks

Monitoring Stateless Session EJBs

Related Topics

EJB Runtime Monitoring