I'm using JBoss 5.1 and leveraging org.jboss.util.threadpool.BasicThreadPool to manage a pool of threads.  Specifically, leveraging JBossWorkManager beans that have a dependency on BasicThreadPool.  Say I have a caller that enqueues runnables to the thread pool.  I want the caller to block when the thread pool queue is full using the following configuration (snippet):

<property name="maximumQueueSize">1024</property>

<property name="minimumPoolSize">1</property>

<property name="maximumPoolSize">20</property>

<property name="keepAliveTime">60000</property>

<property name="blockingMode">wait</property>

Where the blockingMode of wait is used to block the caller (see http://community.jboss.org/wiki/ConfigBasicThreadPool).  Now when the queue is full the subsequent enqueue does not block the caller, instead it runs the runnable as the caller.

How do I get the caller to block?  Mind you that I'm required to use JBossWorkManager.