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:
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Actual results:

Expected results:

Additional info: