java.sql.SQLException: Got a null connection

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java.sql.SQLException: Got a null connection
at com.thortech.xl.dataaccess.tcDataBase.readPartialStatement(Unknown Source)
at com.thortech.xl.dataobj.tcDataBase.readPartialStatement(Unknown Source)
at com.thortech.xl.dataaccess.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataobj.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataaccess.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataobj.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.cache.CacheUtil.getSetCachedQuery(Unknown Source)
at com.thortech.xl.dataobj.tcDataObj.eventPostInsert(Unknown Source)
at com.thortech.xl.dataobj.tcDataObj.insert(Unknown Source)
at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
at com.thortech.xl.dataobj.tcScheduleItem.insertImplementation(Unknown Source)
at com.thortech.xl.dataobj.tcDataObj.insert(Unknown Source)
at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
at com.thortech.xl.attestation.AttestationEngine.attestTask(Unknown Source)
at com.thortech.xl.attestation.AttestationEngine.updateResponses(Unknown Source)
at com.thortech.xl.ejb.beansimpl.AttestationOperationsBean.updateResponses(Unknown Source)
at com.thortech.xl.ejb.beans.AttestationOperationsSession.updateResponses(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1129.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.invocation.Invocation.performCall(Invocation.java:359)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:169)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:168)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:138)
at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:648)
at org.jboss.ejb.Container.invoke(Container.java:960)
at sun.reflect.GeneratedMethodAccessor132.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:169)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:118)
at org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:209)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:195)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:61)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:70)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:112)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:100)
at Thor.API.Operations.AttestationOperationsClient.updateResponses(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1128.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at Thor.API.Base.SecurityInvocationHandler$1.run(Unknown Source)
at Thor.API.Security.LoginHandler.jbossLoginSession.runAs(Unknown Source)
at Thor.API.Base.SecurityInvocationHandler.invoke(Unknown Source)
at com.thortech.xl.schedule.tasks.tcTskSubmitAttestationRequets.execute(Unknown Source)
at com.thortech.xl.scheduler.tasks.SchedulerBaseTask.run(Unknown Source)
at com.thortech.xl.scheduler.core.quartz.QuartzWrapper$TaskExecutionAction.run(Unknown Source)
at Thor.API.Security.LoginHandler.jbossLoginSession.runAs(Unknown Source)
at com.thortech.xl.scheduler.core.quartz.QuartzWrapper.execute(Unknown Source)
at org.quartz.core.JobRunShell.run(JobRunShell.java:203)

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