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Fixes #182

The constructor was based on introspection of Java objects. Specifically this code:

pool = java.util.concurrent.Executors.newCachedThreadPool #=>  <Java::JavaUtilConcurrent::ThreadPoolExecutor:0x3d36e4cd>
pool.queue #=> #<Java::JavaUtilConcurrent::SynchronousQueue:0x525b461a>

I copied this behavior without reading the documentation of SynchronousQueue. In retrospect, it is clear that a synchronous queue, which always blocks and has a fixed size of zero, is not the behavior we want.

@jdantonio jdantonio force-pushed the bug/java-thread-pool branch from f67fb4a to aa9b695 Compare November 26, 2014 17:44
jdantonio added a commit that referenced this pull request Nov 26, 2014
Fixed JavaThreadPoolExecutor queue bug when minimum pool size is zero.
@jdantonio jdantonio merged commit 08f6c4f into master Nov 26, 2014
@jdantonio jdantonio deleted the bug/java-thread-pool branch November 26, 2014 17:44
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JavaThreadPoolExecutor have bounded queue for min_threads = 0

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