we have migrated our application from aix-webloigc to Linux-Websphere and Using spring 4.3.1 / hibernate 4.2.7 & websphere 8.5.5.11 Also we have used WebSphereExtendedJtaPlatform instead of WebSphereExtendedJTATransactionLookup..
we are getting following exception on production.
00000161 RegisteredSyn E WTRN0074E: Exception caught from before_completion synchronization operation: java.lang.UnsupportedOperationException
at org.hibernate.service.jta.platform.internal.WebSphereExtendedJtaPlatform$TransactionManagerAdapter.setRollbackOnly(WebSphereExtendedJtaPlatform.java:139)
at org.hibernate.engine.transaction.internal.jta.CMTTransaction.markRollbackOnly(CMTTransaction.java:131)
at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.setRollbackOnly(TransactionCoordinatorImpl.java:306)
at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.setRollbackOnly(SynchronizationCallbackCoordinatorImpl.java:127)
at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:117)
at org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization.beforeCompletion(RegisteredSynchronization.java:53)
at org.hibernate.service.jta.platform.internal.WebSphereExtendedJtaPlatform$TransactionManagerAdapter$TransactionAdapter$1.invoke(WebSphereExtendedJtaPlatform.java:176)
at com.sun.proxy.$Proxy100.beforeCompletion(Unknown Source)
at com.ibm.ws.jtaextensions.SynchronizationCallbackWrapper.beforeCompletion(SynchronizationCallbackWrapper.java:66)
at com.ibm.tx.jta.impl.RegisteredSyncs.coreDistributeBefore(RegisteredSyncs.java:291)
at com.ibm.ws.tx.jta.RegisteredSyncs.distributeBefore(RegisteredSyncs.java:153)
at com.ibm.ws.tx.jta.TransactionImpl.prePrepare(TransactionImpl.java:2384)
at com.ibm.ws.tx.jta.TransactionImpl.stage1CommitProcessing(TransactionImpl.java:588)
at com.ibm.tx.jta.impl.TransactionImpl.processCommit(TransactionImpl.java:1029)
at com.ibm.tx.jta.impl.TransactionImpl.commit(TransactionImpl.java:963)
at com.ibm.ws.tx.jta.TranManagerImpl.commit(TranManagerImpl.java:439)
at com.ibm.tx.jta.impl.TranManagerSet.commit(TranManagerSet.java:191)
at com.ibm.ws.uow.UOWManagerImpl.uowCommit(UOWManagerImpl.java:807)
at com.ibm.ws.uow.embeddable.EmbeddableUOWManagerImpl.uowEnd(EmbeddableUOWManagerImpl.java:881)
at com.ibm.ws.uow.UOWManagerImpl.uowEnd(UOWManagerImpl.java:782)
at com.ibm.ws.uow.embeddable.EmbeddableUOWManagerImpl.runUnderNewUOW(EmbeddableUOWManagerImpl.java:818)
at com.ibm.ws.uow.embeddable.EmbeddableUOWManagerImpl.runUnderUOW(EmbeddableUOWManagerImpl.java:370)
at org.springframework.transaction.jta.WebSphereUowTransactionManager.execute(WebSphereUowTransactionManager.java:290)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:298)
at org.springframework.transaction.aspectj.AbstractTransactionAspect.ajc$around$org_springframework_transaction_aspectj_AbstractTransactionAspect$1$2a73e96c(AbstractTransactionAspect.aj:70)

kindly let us know the solution since its very critical and impacting on buiseness.