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  1. AMQ Broker
  2. ENTMQBR-3490

The createSession() method throws java.lang.NullPointerException

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Details

    • Bug
    • Resolution: Done
    • Major
    • AMQ 7.7.0.CR2
    • AMQ 7.6.0.GA
    • core-jms-client
    • None
    • +
    • Hide
      Previously, if you used `javax.jms.Connection.createSession()` to create a session on a connection, you could see a null pointer exception. Specifically, this exception could occur if multiple threads were using the connection, and one thread closed the connection while the `createSessionInternal` method concurrently tried to create the session on a separate thread. This issue is resolved. Now, there are concurrency protections that prevent this type of exception from occurring.
      Show
      Previously, if you used `javax.jms.Connection.createSession()` to create a session on a connection, you could see a null pointer exception. Specifically, this exception could occur if multiple threads were using the connection, and one thread closed the connection while the `createSessionInternal` method concurrently tried to create the session on a separate thread. This issue is resolved. Now, there are concurrency protections that prevent this type of exception from occurring.
    • Documented as Resolved Issue
    • Verified in a release

    Description

      When calling a createSession on connection a java.lang.NullPointerException is thrown

      java.lang.NullPointerException
	at org.apache.activemq.artemis.jms.client.ActiveMQConnection.createSessionInternal(ActiveMQConnection.java:619)
	at org.apache.activemq.artemis.jms.client.ActiveMQConnection.createQueueSession(ActiveMQConnection.java:435)

      Looking at the code the same issue exist in AMQ 7.6 GA with later version or Artemis. The NPE is caused by ClientSessionFactory.Impl.createSessionInternal() method returning null if a connection is already closed. This condition may be triggered if multiple threads are trying to use a connection. If one thread closes a connection while another is trying to create a session the NPE may be triggered.

      I think it would be wise to check for null in

      ActiveMQConnection.createSessionInternal()

      before calling

      session.addFailureListener(listener);

      and throw an exception if it is.

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          causes

          Bug - A problem that impairs or prevents the functions of the product. JBEAP-20134 [GSS](7.3.z) ENTMQBR-3817 - The createSession() method throws java.lang.NullPointerException

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Verified

          Bug - A problem that impairs or prevents the functions of the product. JBEAP-19272 [GSS](7.1.z) The createSession() method throws java.lang.NullPointerException

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed
          is cloned by

          Bug - A problem that impairs or prevents the functions of the product. ENTMQBR-3817 [LTS] The createSession() method throws java.lang.NullPointerException

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

          Activity

            People

              rhn-support-jbertram Justin Bertram
              rhn-support-toross Tom Ross
              Tiago Bueno Tiago Bueno
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              Dates

                Created:
                Updated:
                Resolved: