AsyncStore.enqueue() throws 'CacheException: Unable to enqueue asynchronous task' Instead of blocking when the queue is full

Documentation http://docs.jboss.org/infinispan/5.1/apidocs/config.html#ce_loader_async :

"modificationQueueSize int 1024 Sets the size of the modification queue for the async store. If updates are made at a rate that is faster than the underlying cache store can process this queue, then the async store behaves like a synchronous store for that period, blocking until the queue can accept more elements. (Javadoc)"

However the async store doesn't "behaves like synchronous [...] blocking until the queue can accept more elements" because AsyncStore.enqueue() calls

changesDeque.add(mod);

But I guess it should call put() to wait queue to accept more elements.