Description of problem: It is very easy to reproduce the exception. Just request http://localhost:8080/business-central/rest/task/query with your REST client and see the following response due to the missing parameters: <response> <status>FAILURE</status> <url>/business-central/rest/task/query</url> <error>org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: null near line 1, column 855 [select distinct new org.jbpm.services.task.query.TaskSummaryImpl(t.id, t.taskData.processInstanceId, name.shortText,subject.shortText,description.shortText, t.taskData.status, t.priority, t.taskData.skipable, actualOwner,createdBy, t.taskData.createdOn,t.taskData.activationTime,t.taskData.expirationTime, t.taskData.processId,t.taskData.processSessionId, t.subTaskStrategy, t.taskData.parentId ) from org.jbpm.services.task.impl.model.TaskImpl t left join t.taskData.actualOwner as actualOwner left join t.taskData.createdBy as createdBy left join t.subjects as subject left join t.descriptions as description left join t.names as name, org.jbpm.services.task.impl.model.OrganizationalEntityImpl businessAdministrator, org.jbpm.services.task.impl.model.OrganizationalEntityImpl potentialOwners where t.archived = 0 AND ]</error> <stackTrace>java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: null near line 1, column 855 [select distinct new org.jbpm.services.task.query.TaskSummaryImpl(t.id, t.taskData.processInstanceId, name.shortText,subject.shortText,description.shortText, t.taskData.status, t.priority, t.taskData.skipable, actualOwner,createdBy, t.taskData.createdOn,t.taskData.activationTime,t.taskData.expirationTime, t.taskData.processId,t.taskData.processSessionId, t.subTaskStrategy, t.taskData.parentId ) from org.jbpm.services.task.impl.model.TaskImpl t left join t.taskData.actualOwner as actualOwner left join t.taskData.createdBy as createdBy left join t.subjects as subject left join t.descriptions as description left join t.names as name, org.jbpm.services.task.impl.model.OrganizationalEntityImpl businessAdministrator, org.jbpm.services.task.impl.model.OrganizationalEntityImpl potentialOwners where t.archived = 0 AND ] at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1374) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310) at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:294) at org.jbpm.services.task.persistence.JPATaskPersistenceContext.queryStringWithParametersInTransaction(JPATaskPersistenceContext.java:375) at org.jbpm.services.task.impl.TaskQueryServiceImpl.getTasksByVariousFields(TaskQueryServiceImpl.java:480) at org.jbpm.services.task.impl.TaskQueryServiceImpl.getTasksByVariousFields(TaskQueryServiceImpl.java:404) at org.jbpm.services.task.commands.GetTasksByVariousFieldsCommand.execute(GetTasksByVariousFieldsCommand.java:108) at org.jbpm.services.task.commands.GetTasksByVariousFieldsCommand.execute(GetTasksByVariousFieldsCommand.java:28) at org.jbpm.services.task.commands.TaskCommandExecutorImpl$SelfExecutionCommandService.execute(TaskCommandExecutorImpl.java:65) at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:41) at org.jbpm.services.task.persistence.TaskTransactionInterceptor.execute(TaskTransactionInterceptor.java:54) at org.jbpm.services.task.commands.TaskCommandExecutorImpl.execute(TaskCommandExecutorImpl.java:40) at org.jbpm.services.task.impl.command.CommandBasedTaskService.execute(CommandBasedTaskService.java:128) at org.kie.services.remote.rest.RestProcessRequestBean.doTaskOperationOnDeployment(RestProcessRequestBean.java:96) at org.kie.services.remote.rest.RestProcessRequestBean.doTaskOperationWithAlreadySerializedResult(RestProcessRequestBean.java:118) at org.kie.services.remote.rest.RestProcessRequestBean$Proxy$_$$_WeldClientProxy.doTaskOperationWithAlreadySerializedResult(RestProcessRequestBean$Proxy$_$$_WeldClientProxy.java) at org.kie.services.remote.rest.TaskResource.query(TaskResource.java:154) at org.kie.services.remote.rest.TaskResource$Proxy$_$$_WeldClientProxy.query(TaskResource$Proxy$_$$_WeldClientProxy.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.jboss.solder.servlet.exception.CatchExceptionFilter.doFilter(CatchExceptionFilter.java:65) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.jboss.solder.servlet.event.ServletEventBridgeFilter.doFilter(ServletEventBridgeFilter.java:74) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.jbpm.designer.web.filter.impl.PluggableFilter.doFilter(PluggableFilter.java:70) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.uberfire.security.server.UberFireSecurityFilter.doFilter(UberFireSecurityFilter.java:266) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407) at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:408) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) at java.lang.Thread.run(Thread.java:744) Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: null near line 1, column 855 [select distinct new org.jbpm.services.task.query.TaskSummaryImpl(t.id, t.taskData.processInstanceId, name.shortText,subject.shortText,description.shortText, t.taskData.status, t.priority, t.taskData.skipable, actualOwner,createdBy, t.taskData.createdOn,t.taskData.activationTime,t.taskData.expirationTime, t.taskData.processId,t.taskData.processSessionId, t.subTaskStrategy, t.taskData.parentId ) from org.jbpm.services.task.impl.model.TaskImpl t left join t.taskData.actualOwner as actualOwner left join t.taskData.createdBy as createdBy left join t.subjects as subject left join t.descriptions as description left join t.names as name, org.jbpm.services.task.impl.model.OrganizationalEntityImpl businessAdministrator, org.jbpm.services.task.impl.model.OrganizationalEntityImpl potentialOwners where t.archived = 0 AND ] at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54) at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47) at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:79) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:276) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80) at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168) at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:221) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:199) at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1778) at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:291) ... 59 more </stackTrace> </response> Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Fixed on master: https://github.com/droolsjbpm/jbpm/commit/1e3e6b2a Waiting for flags before cherry-picking to 6.0.x.
*** Bug 1071944 has been marked as a duplicate of this bug. ***
Cherry-picked to 6.0.x: https://github.com/droolsjbpm/jbpm/commit/25d9a5684a
Typo in last comment: commit url is https://github.com/droolsjbpm/jbpm/commit/25d9a5684
Verified in BPMS 6.0.2.ER2