Problem JMS-c api for message Acknowledgement

Question

Hi,
          I am working in a project that uses bea-JMS C api for
          Communictions.In my project i am using topic messaging for message reciving and sending..Here i am using durablesubscriber for receiving and client Acknowledgement to Acknowledge the message.
          In receiving function I store the message in another JmsMessage for Client-Acknowledgement.
          Here comes one problem that, while i Acknowledge on the receive function each and every message Acknowledge correctly.But while i Acknowledge that message from some other function it return -1 as , that it cannot Acknowledge.The other function is working in another thread.
          Wheather the seprate thread will make the problem for confirmation.

Answer 1

Similar to JDBC connections, JMS sessions and their related child producers and consumers are not thread-safe (with the one exception of the session.close() method).
          For example, without added application level locking, its not safe to acknowledge a message from one thread while another thread receives or produces a message. This has special implications for asynchronous consumers, as once the asynchronous consumer is created, access to the session and objects is limited to code within the "onMessage()" and "onException()" callbacks.
          This behavior is detailed in the JMS specification.
          Tom