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java.lang.NullPointerException: 	at com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.UpdateQueryPlan.addConstraint(UpdateQueryPlan.java:202)	at com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.UpdateQueryPlan.addBasetableConstraint(UpdateQueryPlan.java:257)	at com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.UpdateQueryPlan.processStatements(UpdateQueryPlan.java:321)	at com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.UpdateQueryPlan.build(UpdateQueryPlan.java:188)	at com.sun.jdo.spi.persistence.support.sqlstore.model.ClassDesc.getUpdateQueryPlanForUpdate(ClassDesc.java:2070)	at com.sun.jdo.spi.persistence.support.sqlstore.model.ClassDesc.getUpdateQueryPlan(ClassDesc.java:2032)	at com.sun.jdo.spi.persistence.support.sqlstore.SQLStoreManager.executeBatch(SQLStoreManager.java:1546)	at com.sun.jdo.spi.persistence.support.sqlstore.SQLStateManager.updatePersistent(SQLStateManager.java:997)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerImpl.beforeCompletion(PersistenceManagerImpl.java:1251)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.notifyBeforeCompletion(TransactionImpl.java:1115)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.commitBefore(TransactionImpl.java:743)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.beforeCompletion(TransactionImpl.java:646)	at com.sun.ejb.containers.ContainerSynchronization.beforeCompletion(ContainerSynchronization.java:105)	at com.sun.enterprise.distributedtx.J2EETransaction.commit(J2EETransaction.java:183)	at com.sun.enterprise.distributedtx.J2EETransactionManagerOpt.commit(J2EETransactionManagerOpt.java:310)	at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:1786)	at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:1585)	at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:510)	at com.putnaminv.car.ejb.services.compositemanager.CompositeManagerBean_EJBObjectImpl.updateComposite(CompositeManagerBean_EJBObjectImpl.java:104)	at com.putnaminv.car.ejb.services.compositemanager._CompositeManager_Stub.updateComposite(Unknown Source)	at com.putnaminv.car.web.action.CompositeAction.updateComposite(CompositeAction.java:231)	at com.putnaminv.car.web.action.CompositeAction.execute(CompositeAction.java:114)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:446)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:266)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)	at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)	at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)	at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)