Why my CMS consumer application throws "Java Heap Space" exception

Issue

• I am using OpenWire ActiveMQ CMS client. I don't have Java code at all. When I am performing testing sometimes I met Java Heap Space exception and consumer application aborted. The exception was captured by the CMSException:

 // If something bad happens you see it here as this class is also been registered as an ExceptionListener with the connection.
       virtual void onException(const CMSException& ex AMQCPP_UNUSED) {
           printf("CMS Exception occurred.  Shutting down client.\n", ex.getMessage().c_str());
        exit(1);
    }

I don't understand why the C++ Client throws Java exception. Does ActiveMQ CMS framework have any Java code that may cause the issue?