Java EE7 ManagedExecutorService

So you have a WebLogic and want to try out the fancy "new" feature of having managed threads.

Have the ExecutorService configured first in weblogic.xml.

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<!-- weblogic.xml --> <managed-executor-service>  <name>CustomMES</name>  <max-concurrent-long-running-requests>10</max-concurrent-long-running-requests> </managed-executor-service> <resource-env-description>  <resource-env-ref-name>concurrent/CustomMES</resource-env-ref-name>  <resource-link>CustomMES</resource-link> </resource-env-description>

Then name it in web.xml.

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<!-- web.xml --> <resource-env-ref>  <resource-env-ref-name>concurrent/CustomMES</resource-env-ref-name>  <resource-env-ref-type>javax.enterprise.concurrent.ManagedExecutorService</resource-env-ref-type> </resource-env-ref>

Now, you can ask for it.

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public static ExecutorService getExecutorService() {  try {   // Get our own, defined in weblogic.xml   return InitialContext.doLookup("java:comp/env/concurrent/CustomMES");  } catch (final NamingException e) {}  try {   // Fallback level 1: Get the Java EE 7 default MES   return InitialContext.doLookup("java:comp/DefaultManagedExecutorService");  } catch (final NamingException e) {}  // Fallback level 2: Return the default pool.  // This always exists. In fact, every Java8 threaded feature uses this.  return ForkJoinPool.commonPool(); }

In the latter case, you could use the @Resource annotation with the mappedBy attribute, if you have properly configured beans.

The ExecutorService is already an Executor, so you can pass it to eg. a CompletableFuture:

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CompletableFuture<void> future = CompletableFuture             .supplyAsync(Frobolator::aSupplier, getExecutorService())             .thenAccept(result -> bar(result));   // Later, wait for the Future, if necessary. future.join();

But properly usingCompletableFutures are another topic...

Implementation of the ManagedExecutorService in WebLogic is here: $ORACLE_HOME\wlserver\modules\com.oracle.weblogic.concurrent.jar