We are getting another exception while trying to delete a process instance associated with timers:

Hibernate: delete from JBPM_TOKENVARIABLEMAP where ID_=?
Hibernate: delete from JBPM_MODULEINSTANCE where ID_=?
Hibernate: delete from JBPM_PROCESSINSTANCE where ID_=? and VERSION_=?
2006-11-01 19:34:10,422 ERROR [org.hibernate.util.JDBCExceptionReporter] - <ERROR: update or delete on "jbpm_processinstance" violates foreign key constraint "fk_timer_prinst" on "jbpm_timer">
2006-11-01 19:34:10,422 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] - <Could not synchronize database state with session>
org.hibernate.exception.ConstraintViolationException: could not delete: [org.jbpm.graph.exe.ProcessInstance#934]
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2308)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2440)
 at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:73)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
 at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:584)
 at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:496)
 at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:469)
 at org.springframework.transaction.interceptor.TransactionAspectSupport.doCommitTransactionAfterReturning(TransactionAspectSupport.java:266)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
 at $Proxy6.updateAndAdjustWorkflow(Unknown Source)
 at org.donorschoose.web.control.admin.ProposalDetailController.onFormSubmit(ProposalDetailController.java:127)
 at org.donorschoose.web.control.admin.AdminBaseFormController.onSubmit(AdminBaseFormController.java:137)
 at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:258)
 at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:259)
 at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:139)
 at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:717)
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:658)
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:392)
 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:357)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.donorschoose.web.filter.ActionFilter.doFilter(ActionFilter.java:95)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.sql.SQLException: ERROR: update or delete on "jbpm_processinstance" violates foreign key constraint "fk_timer_prinst" on "jbpm_timer"
 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1471)
 at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1256)
 at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:175)
 at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:389)
 at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:330)
 at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:282)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2294)
 ... 51 more
2006-11-01 19:34:13,456 DEBUG [org.donorschoose.web.filter.ActionFilter] - <The requested page is /dev/admin/proposal_details.html>
Hibernate: select uridetail0_.id as id110_, uridetail0_.name as name110_, uridetail0_.urigroupId as urigroupId110_ from URI uridetail0_ where uridetail0_.name=?
2006-11-01 19:34:13,516 DEBUG [org.donorschoose.web.filter.ActionFilter] - <The Priviliges for the requested page are: null>
2006-11-01 19:34:13,516 DEBUG [org.donorschoose.web.control.admin.ProposalDetailController] - <<admin.AdminBaseFormController> Entered method isFormSubmission>
2006-11-01 19:34:13,516 DEBUG [org.donorschoose.web.control.admin.ProposalDetailController] - <Displaying new form>
2006-11-01 19:34:13,516 DEBUG [org.donorschoose.web.control.admin.ProposalDetailController] - <<formBackingObject> Method entered >