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POHow to use ROWLOCK with EJB
 

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  1. POHow to use ROWLOCK with EJB
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    <p>I have a problem where I get a deadlock on a MS SQL Server. The same code runs without problems on MySQL.</p> <p>My problem is that I receive a request to delete a job (which is attached to a device), and afterwards I receive a request to create a new job for the same device. Most times this works without any problems, but once in a while the delete request is not finished when I receive the request to create a new job for the device, and this is where I get the deadlock.</p> <p>The application is running on JBoss, and I receive the requests from a message queue.</p> <p>I have found out that I probably could solve the problem on MSSQL using the rowlock keyword, but how do I enable this when using named queries and at the same time supporting MySQL?</p> <p>Or are there any other way I could ensure that one request finishes before running the next request for the same device?</p> <p>A stacktrace with some parts removed looks like the following:</p> <pre><code>2009-08-11 10:03:22,621 WARN [org.hibernate.util.JDBCExceptionReporter] SQL Error: 1205, SQLState: 40001 2009-08-11 10:03:22,621 ERROR [org.hibernate.util.JDBCExceptionReporter] Transaction (Process ID 200) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. 2009-08-11 10:03:22,621 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] Could not synchronize database state with session org.hibernate.exception.LockAcquisitionException: could not delete: [dme.dm.device.Task#131] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:82) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) ---cut cut cut--- Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: Transaction (Process ID 200) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(Unknown Source) ---cut cut cut--- </code></pre>
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