com.liferay.portal.kernel.job.JobExecutionException: java.sql.SQLException: Closed Connection

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com.liferay.portal.kernel.job.JobExecutionException: java.sql.SQLException: Closed Connection	at com.liferay.counter.service.persistence.ConnectionHeartbeatJob.execute(ConnectionHeartbeatJob.java:55)	at com.liferay.portal.job.JobWrapper.execute(JobWrapper.java:69)	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)Caused by: java.sql.SQLException: Closed Connection	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:153)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:201)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:306)	at oracle.jdbc.driver.PhysicalConnection.createStatement(PhysicalConnection.java:865)	at oracle.jdbc.driver.PhysicalConnection.createStatement(PhysicalConnection.java:827)	at org.jboss.resource.adapter.jdbc.WrappedConnection.createStatement(WrappedConnection.java:176)	at sun.reflect.GeneratedMethodAccessor669.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy$LazyConnectionInvocationHandler.invoke(LazyConnectionDataSourceProxy.java:364)	at $Proxy53.createStatement(Unknown Source)	at com.liferay.counter.service.persistence.ConnectionHeartbeatJob.sendHeartbeat(ConnectionHeartbeatJob.java:73)	at com.liferay.counter.service.persistence.ConnectionHeartbeatJob.execute(ConnectionHeartbeatJob.java:52)	... 3 more