You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@uima.apache.org by "Jerry Cwiklik (JIRA)" <ui...@incubator.apache.org> on 2009/07/31 22:39:14 UTC
[jira] Created: (UIMA-1476) Fix race condition in the UIMA As
client when creating a shared JMS connection
Fix race condition in the UIMA As client when creating a shared JMS connection
------------------------------------------------------------------------------
Key: UIMA-1476
URL: https://issues.apache.org/jira/browse/UIMA-1476
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
When scaling a UIMA AS client in the same JVM there is a race condition that causes NullPointer exception. The exception is thrown when trying to access a JMSConnection object that is not yet initialized. The problem is in the setupConnection() method where the SharedConnection is initialized in two steps:
1) Default constructor creates an instance of the SharedConnection
2) setConnection method is called with a new Connection object
The problem is that the code in initialize() method checks if the sharedConnection != null and if so proceeds to initializeProducer() method. So the race condition is that SharedConnection constructor finishes, a thread sees that it is not null and calls initializeProducer BEFORE the connection is set.
Fix the code so that connection is passed in as an argument to a constructor assuring that as soon as the SharedConnection is instantiated it is fully initialized
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] Closed: (UIMA-1476) Fix race condition in the UIMA As client
when creating a shared JMS connection
Posted by "Jerry Cwiklik (JIRA)" <ui...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/UIMA-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jerry Cwiklik closed UIMA-1476.
-------------------------------
Resolution: Fixed
Fixed race condition that causes NullPointerException while initializing multiple Uima AS clients in the same JVM
> Fix race condition in the UIMA As client when creating a shared JMS connection
> ------------------------------------------------------------------------------
>
> Key: UIMA-1476
> URL: https://issues.apache.org/jira/browse/UIMA-1476
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> When scaling a UIMA AS client in the same JVM there is a race condition that causes NullPointer exception. The exception is thrown when trying to access a JMSConnection object that is not yet initialized. The problem is in the setupConnection() method where the SharedConnection is initialized in two steps:
> 1) Default constructor creates an instance of the SharedConnection
> 2) setConnection method is called with a new Connection object
> The problem is that the code in initialize() method checks if the sharedConnection != null and if so proceeds to initializeProducer() method. So the race condition is that SharedConnection constructor finishes, a thread sees that it is not null and calls initializeProducer BEFORE the connection is set.
> Fix the code so that connection is passed in as an argument to a constructor assuring that as soon as the SharedConnection is instantiated it is fully initialized
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] Updated: (UIMA-1476) Fix race condition in the UIMA As
client when creating a shared JMS connection
Posted by "Jerry Cwiklik (JIRA)" <ui...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/UIMA-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jerry Cwiklik updated UIMA-1476:
--------------------------------
Fix Version/s: 2.3AS
> Fix race condition in the UIMA As client when creating a shared JMS connection
> ------------------------------------------------------------------------------
>
> Key: UIMA-1476
> URL: https://issues.apache.org/jira/browse/UIMA-1476
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
> Fix For: 2.3AS
>
>
> When scaling a UIMA AS client in the same JVM there is a race condition that causes NullPointer exception. The exception is thrown when trying to access a JMSConnection object that is not yet initialized. The problem is in the setupConnection() method where the SharedConnection is initialized in two steps:
> 1) Default constructor creates an instance of the SharedConnection
> 2) setConnection method is called with a new Connection object
> The problem is that the code in initialize() method checks if the sharedConnection != null and if so proceeds to initializeProducer() method. So the race condition is that SharedConnection constructor finishes, a thread sees that it is not null and calls initializeProducer BEFORE the connection is set.
> Fix the code so that connection is passed in as an argument to a constructor assuring that as soon as the SharedConnection is instantiated it is fully initialized
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.