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This exception has no message.
java.lang.NullPointerException: 	at com.sun.appserv.util.cache.BaseCache.hash(BaseCache.java:174)	at com.sun.appserv.util.cache.BaseCache.get(BaseCache.java:295)	at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.getResourceList(J2EETransactionManagerImpl.java:733)	at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.enlistComponentResources(J2EETransactionManagerImpl.java:500)	at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.enlistComponentResources(J2EETransactionManagerImpl.java:347)	at com.sun.enterprise.distributedtx.UserTransactionImpl.begin(UserTransactionImpl.java:130)	at org.springframework.transaction.jta.JtaTransactionManager.doBegin(JtaTransactionManager.java:437)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:271)	at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:201)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:49)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:619)	at ca.aeso.itc.service.LockManager$$EnhancerByCGLIB$$936cdaf9.lock()	at ca.aeso.itc.job.SynchronizedJob.execute(SynchronizedJob.java:44)	at com.aptc.corp.schedule.Scheduler$ThreadPool$WorkerThread.run(Scheduler.java:498)