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在兩個Websphere節點中運行的Java程序中，以下競爭場景發生在由Websphere Transaction Manager管理的分佈式事務中。事務跨越JMS（Websphere-MQ）事務源和數據庫（Oracle）事務源。我想了解爲什麼在stage3CommitProcessing期間事務回滾？
- 爲什麼這個（例外在線程2，在步驟B6）的例外發生了什麼？我期望沒有問題發生。線程2只有在事務TX2中確保T1被鎖定之後才能繼續進行，因此線程1正在等待T1表鎖定（在事務TX1內）釋放。我想知道的是爲什麼線程2遇到stage3CommitProcessing異常？我怎麼能得到更多的細節，因爲這個例外沒有透露任何有關它的信息？
- 如何調試這種事務相關的比賽場景？我知道這可能很難重現。但是我認爲可能會有一些Websphere相關的日誌，我可以在Stage3中看到提交失敗的原因。如果有人能指出我的這個方向，那將會很棒。
- 如何避免/解決？
線程1（在WebSphere節點運行1）
A1: Start TX1
A2: Read messages (maximum of 1000 at a time) from Queue Q1
A3: LOCK TABLE T1 IN EXCLUSIVE MODE
Got exception "ORA-02049": distributed transaction waiting for lock.
Refer Log 1 for stack trace
線程2（運行在WebSphere節點2）
B1: Start TX2
B2: Read messages (maximum of 1000 at a time) from Queue Q1
B3: LOCK TABLE T1 IN EXCLUSIVE MODE
B4: Batch execute
MERGE INTO T1 the messages read
B5: Batch insert messages into T2
B6: Commit TX2
Got JTA transaction unexpectedly rolled back (maybe due to a timeout). Refer Log 2 for stack trace. This was while ***stage3CommitProcessing***.
日誌1：
org.springframework.jdbc.BadSqlGrammarException：StatementCallback;錯誤的SQL語法[LOCK TABLE T1 IN EXCLUSIVE MODE];嵌套異常是java.sql.SQLSyntaxErrorException：ORA-02049：超時：分佈式事務等待鎖
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:94)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:406)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:518)
at org.springframework.jdbc.core.simple.SimpleJdbcTemplate.update(SimpleJdbcTemplate.java:248)
at com.test.OracleTableLock.processMessage(OracleTableLock.java:52)
at sun.reflect.GeneratedMethodAccessor833.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:600)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy153.receiveMessage(Unknown Source)
at com.test.BatchProcessor.processMessage(BatchProcessor.java:343)
at sun.reflect.GeneratedMethodAccessor779.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:600)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy155.receiveMessage(Unknown Source)
at sun.reflect.GeneratedMethodAccessor778.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:600)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273)
at org.springframework.scheduling.support.MethodInvokingRunnable.run(MethodInvokingRunnable.java:65)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:51)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:453)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:329)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:162)
at org.springframework.scheduling.commonj.TimerManagerTaskScheduler$TimerScheduledFuture.timerExpired(TimerManagerTaskScheduler.java:112)
at com.ibm.ws.asynchbeans.timer.TimerImpl.callListenerMethod(TimerImpl.java:298)
at com.ibm.ws.asynchbeans.timer.GenericTimer.run(GenericTimer.java:216)
at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:264)
at java.security.AccessController.doPrivileged(AccessController.java:224)
at javax.security.auth.Subject.doAs(Subject.java:495)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:131)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:89)
at com.ibm.ws.asynchbeans.J2EEContext$DoAsProxy.run(J2EEContext.java:335)
at java.security.AccessController.doPrivileged(AccessController.java:251)
at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:1146)
at com.ibm.ws.asynchbeans.timer.TimerImpl.runListenerAsCJWork(TimerImpl.java:425)
at com.ibm.ws.asynchbeans.am._Alarm.fireAlarm(_Alarm.java:333)
at com.ibm.ws.asynchbeans.am._Alarm.run(_Alarm.java:230)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550)
Caused by: java.sql.SQLSyntaxErrorException: ORA-02049: timeout: distributed transaction waiting for lock
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:91)
at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:206)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:455)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:413)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:1034)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:183)
at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:942)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1222)
at oracle.jdbc.driver.OracleStatement.executeUpdateInternal(OracleStatement.java:1706)
at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:1674)
at oracle.jdbc.driver.OracleStatementWrapper.executeUpdate(OracleStatementWrapper.java:275)
at com.ibm.ws.rsadapter.jdbc.WSJdbcStatement.pmiExecuteUpdate(WSJdbcStatement.java:1683)
at com.ibm.ws.rsadapter.jdbc.WSJdbcStatement.executeUpdate(WSJdbcStatement.java:1041)
at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:508)
at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:1)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:395)
... 50 more
日誌2：
org.springframework.transaction.UnexpectedRollbackException: JTA transaction unexpectedly rolled back (maybe due to a timeout); nested exception is javax.transaction.RollbackException
at org.springframework.transaction.jta.JtaTransactionManager.doCommit(JtaTransactionManager.java:1012)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
at com.test.BatchProcessor.processMessage(BatchProcessor.java:359)
at sun.reflect.GeneratedMethodAccessor1541.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:600)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy204.receiveMessage(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1540.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:600)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273)
at org.springframework.scheduling.support.MethodInvokingRunnable.run(MethodInvokingRunnable.java:65)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:51)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:453)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:329)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java)
at org.springframework.scheduling.commonj.TimerManagerTaskScheduler$TimerScheduledFuture.timerExpired(TimerManagerTaskScheduler.java:112)
at com.ibm.ws.asynchbeans.timer.TimerImpl.callListenerMethod(TimerImpl.java:298)
at com.ibm.ws.asynchbeans.timer.GenericTimer.run(GenericTimer.java:216)
at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:264)
at java.security.AccessController.doPrivileged(AccessController.java:224)
at javax.security.auth.Subject.doAs(Subject.java:495)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:131)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:89)
at com.ibm.ws.asynchbeans.J2EEContext$DoAsProxy.run(J2EEContext.java:335)
at java.security.AccessController.doPrivileged(AccessController.java:251)
at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:1146)
at com.ibm.ws.asynchbeans.timer.TimerImpl.runListenerAsCJWork(TimerImpl.java:425)
at com.ibm.ws.asynchbeans.am._Alarm.fireAlarm(_Alarm.java:333)
at com.ibm.ws.asynchbeans.am._Alarm.run(_Alarm.java:230)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550)
Caused by: javax.transaction.RollbackException
at com.ibm.tx.jta.TransactionImpl.stage3CommitProcessing(TransactionImpl.java:1217)
at com.ibm.tx.jta.TransactionImpl.processCommit(TransactionImpl.java:991)
at com.ibm.tx.jta.TransactionImpl.commit(TransactionImpl.java:913)
at com.ibm.ws.tx.jta.TranManagerImpl.commit(TranManagerImpl.java:377)
at com.ibm.tx.jta.TranManagerSet.commit(TranManagerSet.java:161)
at com.ibm.ws.tx.jta.UserTransactionImpl.commit(UserTransactionImpl.java:293)
at org.springframework.transaction.jta.JtaTransactionManager.doCommit(JtaTransactionManager.java:1009)
... 37 more