We've run into the same situation using WLS81SP2 with the IBM Informix
drivers
version 2.21JC5. Our application works fine initially, performing some
tasks
just fine. But after a few repitions, we get

javax.ejb.FinderException: Problem in findByPrimaryKey while preparing
or executing statement:
'weblogic.jdbc.wrapper.PreparedStatement_com_infor mix_jdbc_IfxPreparedStatement@45c':
java.sql.SQLException: [Internal] Error while trying to set up start
or end key for index read [fmstopset_release]
java.sql.SQLException: [Internal] Error while trying to set up start
or end key for index read [fmstopset_release]
at com.informix.jdbc.IfxSqli.addException(IfxSqli.jav a:3082)
at com.informix.jdbc.IfxSqli.receiveError(IfxSqli.jav a:3396)
at com.informix.jdbc.IfxSqli.dispatchMsg(IfxSqli.java :2259)
at com.informix.jdbcx.IfxXASqli.receiveMessage(IfxXAS qli.java:119)
at com.informix.jdbc.IfxSqli.sendStatementQuery(IfxSq li.java:1444)
at com.informix.jdbc.IfxSqli.executeStatementQuery(If xSqli.java:1383)
at com.informix.jdbc.IfxSqli.executeStatementQuery(If xSqli.java:1313)
at com.informix.jdbc.IfxResultSet.executeQuery(IfxRes ultSet.java:216)
at com.informix.jdbc.IfxStatement.executeQueryImpl(If xStatement.java:839)
at com.informix.jdbc.IfxPreparedStatement.executeQuer y(IfxPreparedStatement.java:246)
at weblogic.jdbc.wrapper.PreparedStatement.executeQue ry(PreparedStatement.java:80)
at org.ecmc.lms.model.eboprofil.Boprofil_26bdr2__WebL ogic_CMP_RDBMS.ejbFindByPrimaryKey(Boprofil_26bdr2 __WebLogic_CMP_RDBMS.java:3697)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.f indByPrimaryKey(RDBMSPersistenceManager.java:239)
at weblogic.ejb20.manager.BaseEntityManager.findByPri maryKey(BaseEntityManager.java:1473)
at weblogic.ejb20.manager.BaseEntityManager.localFind ByPrimaryKey(BaseEntityManager.java:1429)
at weblogic.ejb20.internal.EntityEJBLocalHome.findByP rimaryKey(EntityEJBLocalHome.java:264)
at org.ecmc.lms.model.eboprofil.Boprofil_26bdr2_Local HomeImpl.findByPrimaryKey(Boprofil_26bdr2_LocalHom eImpl.java:277)
at org.ecmc.nib.model.CommonFinders.getBorrowerProfil e(CommonFinders.java:110)
at org.ecmc.nib.model.CommonFinders.getBorrowerProfil eForPlacement(CommonFinders.java:126)
at org.ecmc.nib.model.CollectorWorkFacadeBean.retriev eAddressPhoneInfo(CollectorWorkFacadeBean.java:144 )
at org.ecmc.nib.model.CollectorWorkFacadeBean.lookupC ollectorWorkWindow(CollectorWorkFacadeBean.java:96 )
at org.ecmc.nib.model.CollectorWorkFacade_afjei8_EOIm pl.lookupCollectorWorkWindow(CollectorWorkFacade_a fjei8_EOImpl.java:46)
at org.ecmc.nib.model.CollectorWorkFacade_afjei8_EOIm pl_WLSkel.invoke(Unknown
Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicS erverRef.java:477)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke( ReplicaAwareServerRef.java:108)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicSe rverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubjec t.doAs(AuthenticatedSubject.java:353)
at weblogic.security.service.SecurityManager.runAs(Se curityManager.java:144)
at weblogic.rmi.internal.BasicServerRef.handleRequest (BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute( BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThrea d.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.ja va:170)

at org.ecmc.lms.model.eboprofil.Boprofil_26bdr2__WebL ogic_CMP_RDBMS.ejbFindByPrimaryKey(Boprofil_26bdr2 __WebLogic_CMP_RDBMS.java:3736)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.f indByPrimaryKey(RDBMSPersistenceManager.java:239)
at weblogic.ejb20.manager.BaseEntityManager.findByPri maryKey(BaseEntityManager.java:1473)
at weblogic.ejb20.manager.BaseEntityManager.localFind ByPrimaryKey(BaseEntityManager.java:1429)
at weblogic.ejb20.internal.EntityEJBLocalHome.findByP rimaryKey(EntityEJBLocalHome.java:264)
at org.ecmc.lms.model.eboprofil.Boprofil_26bdr2_Local HomeImpl.findByPrimaryKey(Boprofil_26bdr2_LocalHom eImpl.java:277)
at org.ecmc.nib.model.CommonFinders.getBorrowerProfil e(CommonFinders.java:110)
at org.ecmc.nib.model.CommonFinders.getBorrowerProfil eForPlacement(CommonFinders.java:126)
at org.ecmc.nib.model.CollectorWorkFacadeBean.retriev eAddressPhoneInfo(CollectorWorkFacadeBean.java:144 )
at org.ecmc.nib.model.CollectorWorkFacadeBean.lookupC ollectorWorkWindow(CollectorWorkFacadeBean.java:96 )
at org.ecmc.nib.model.CollectorWorkFacade_afjei8_EOIm pl.lookupCollectorWorkWindow(CollectorWorkFacade_a fjei8_EOImpl.java:46)
at org.ecmc.nib.model.CollectorWorkFacade_afjei8_EOIm pl_WLSkel.invoke(Unknown
Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicS erverRef.java:477)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke( ReplicaAwareServerRef.java:108)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicSe rverRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubjec t.doAs(AuthenticatedSubject.java:353)
at weblogic.security.service.SecurityManager.runAs(Se curityManager.java:144)
at weblogic.rmi.internal.BasicServerRef.handleRequest (BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute( BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThrea d.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.ja va:170)