Is this multi-thread safe? - calling methods on the proxy object returned by JmsProxyFactoryBean

Is it possible to call methods on the object returned by JmsProxyFactoryBean.getObject() from multiple threads simultaneously? Do the method calls get serialized somehow?
Is there any multi-thread synchronization somewhere down the line?
If the receiving end-point of the method call (a different process) dies, will there be a release of synchronized locks somewhere?