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org.postgresql.util.PSQLException: This connection has been closed. 	at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:714)	at org.postgresql.jdbc2.AbstractJdbc2Connection.rollback(AbstractJdbc2Connection.java:731)	at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:368)	at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:368)	at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.rollback(PoolingDataSource.java:323)	at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit(JDBCTransaction.java:183)	at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:162)	at org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:676)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)	at org.springframework.transaction.support.TransactionTemplate.rollbackOnException(TransactionTemplate.java:161)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:134)	at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)	at org.activiti.engine.impl.jobexecutor.JobAcquisitionThread.run(JobAcquisitionThread.java:63)