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21.3. Configuring EJB Thread Pools

21.3.1. Enterprise Bean Thread Pools
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JBoss EAP 6 maintains number of instances of Java thread objects in memory for use by enterprise bean services, including remote invocation, the timer service, and asynchronous invocation.
This technique is called thread pooling. It provides improved performance by eliminating the overhead of thread creation and gives the system administrator a mechanism for controlling resource usage.
Multiple thread pools can be created with different parameters and each service can be allocated a different thread pool.
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21.3.2. Create a Thread Pool
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EJB Thread pools can be created using the Management Console or the CLI.

Procedure 21.10. Create an EJB Thread Pool using the Management Console

  1. Login to the Management Console. Section 3.3.2, “Log in to the Management Console”
  2. Click on the Configuration tab at the top of the screen.
  3. Expand the Container menu and select EJB 3.
  4. Select the Thread Pools tab and click Add.
  5. Specify the Name and Max Threads values.
  6. Click Save to finish.

Procedure 21.11. Create a Thread Pool using the CLI

  1. Launch the CLI tool and connect to your server. Refer to Section 3.4.4, “Connect to a Managed Server Instance Using the Management CLI”.
  2. Use the add operation with the following syntax. 
    /subsystem=ejb3/thread-pool=THREAD_POOL_NAME:add(max-threads=MAX_SIZE)
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    • Replace THREAD_POOL_NAME with the name of the thread pool.
    • Replace MAX_SIZE with the maximum size of the thread pool.
  3. Use the read-resource operation to confirm the creation of the bean pool. 
    /subsystem=ejb3/thread-pool=THREAD_POOL_NAME:read-resource
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Example 21.7. Create a Thread Pool using the CLI

[standalone@localhost:9999 /] /subsystem=ejb3/thread-pool=my-test-pool:add(max-threads=20)
{"outcome" => "success"}
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Example 21.8. XML Configuration Sample

<subsystem xmlns="urn:jboss:domain:ejb3:1.5">
   ...
   <thread-pools>
      ...
      <thread-pool name="my-test-pool" max-threads="20"/>
   </thread-pools>
   ...
</subsystem>
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21.3.3. Remove a Thread Pool
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Unused EJB thread pools can be removed using the Management Console.

Prerequisites

Procedure 21.12. Remove an EJB thread pool using the Management Console

  1. Login to the Management Console. Section 3.3.2, “Log in to the Management Console”.
  2. Click on the Configuration tab at the top of the screen. Expand the Container menu and select EJB 3. Select the Thread Pools tab.
  3. Select the thread pool to you want to remove.
  4. Click Remove. The Remove Item dialog appears.
  5. Click Confirm.

Procedure 21.13. Remove a thread pool using the CLI

  1. Launch the CLI tool and connect to your server. Refer to Section 3.4.4, “Connect to a Managed Server Instance Using the Management CLI”.
  2. Use the remove operation with the following syntax. 
    /subsystem=ejb3/thread-pool=THREADPOOLNAME:remove
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    • Replace THREADPOOLNAME with the name of the thread pool.

Example 21.9. Removing a Thread Pool using the CLI

[standalone@localhost:9999 /] /subsystem=ejb3/thread-pool=ACCTS_THREADS:remove
{"outcome" => "success"}
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21.3.4. Edit a Thread Pool
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JBoss Administrators can edit Thread Pools using the Management Console and the CLI.

Procedure 21.14. Edit a Thread Pool using the Management Console

  1. Login to the Management Console. Section 3.3.2, “Log in to the Management Console”.
  2. Click on the Configuration tab at the top of the screen. Expand the Container menu and select EJB 3. Select the Thread Pools tab.
  3. Select the thread pool you want to edit.

  4. Click Edit.
  5. Edit the details you want to change. Only the Thread Factory, Max Threads, Keepalive Timeout, and Keepalive Timeout Unit values can be edited.
  6. Click Save to finish.

Procedure 21.15. Edit a thread pool using the CLI

  1. Launch the CLI tool and connect to your server. Refer to Section 3.4.4, “Connect to a Managed Server Instance Using the Management CLI”.
  2. Use the write_attribute operation with the following syntax for each attribute of the thread pool to be changed. 
    /subsystem=ejb3/thread-pool=THREADPOOLNAME:write-attribute(name="ATTRIBUTE", value="VALUE")
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    • Replace THREADPOOLNAME with the name of the thread pool.
    • Replace ATTRIBUTE with the name of the attribute to be edited. The attributes that can be edited in this way are keepalive-time, max-threads, and thread-factory.
    • Replace VALUE with the required value of the attribute.
  3. Use the read-resource operation to confirm the changes to the thread pool. 
    /subsystem=ejb3/thread-pool=THREADPOOLNAME:read-resource
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Important

When changing the value of the keepalive-time attribute with the CLI the required value is an object representation. It has the following syntax. 
/subsystem=ejb3/thread-pool=THREADPOOLNAME:write-attribute(name="keepalive-time", value={"time" => "VALUE","unit" => "UNIT"}
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Example 21.10. Set the Maxsize Value of a Thread Pool using the CLI

[standalone@localhost:9999 /] /subsystem=ejb3/thread-pool=HSThreads:write-attribute(name="max-threads", value="50")
{"outcome" => "success"}
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Example 21.11. Set the keepalive-time Time Value of a Thread Pool using the CLI

[standalone@localhost:9999 /] /subsystem=ejb3/thread-pool=HSThreads:write-attribute(name="keepalive-time", value={"time"=>"150"})
{"outcome" => "success"}
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