Affects: Release Notes
Date of First Response: 2010-02-25 14:38:20
Help Desk Ticket Reference: https://enterprise.redhat.com/issue-tracker/363931
project_key: SOA

org.jbpm.command.GetTaskListCommand.execute() throws JbpmPersistenceException if there is no pooled task instances for a given actor even if the actor has personally assigned task instaces.

=====
org.jbpm.persistence.JbpmPersistenceException: couldn't get task instances by ids '[]'
at org.jbpm.db.TaskMgmtSession.findTaskInstancesByIds(TaskMgmtSession.java:204)
at org.jbpm.db.TaskMgmtSession.findPooledTaskInstances(TaskMgmtSession.java:123)
at org.jbpm.JbpmContext.getGroupTaskList(JbpmContext.java:194)
at org.jbpm.command.GetTaskListCommand.execute(GetTaskListCommand.java:54)
at sample.task.ws.TaskSampleWS.test(TaskSampleWS.java:52)
=====

In case of CP01, GetTaskListCommand returns the personal task list without Exception.

This behavior is caused by the change introduced by r4076 in org.jbpm.db.TaskMgmtSession.findTaskInstancesByIds().

r4705
===
  public List<TaskInstance> findTaskInstancesByIds(List<Long> taskInstanceIds) {
    List<TaskInstance> result;
    if (taskInstanceIds.isEmpty()) {
      result = Collections.emptyList();
    }
    else {
      try {
        Query query = session.getNamedQuery("TaskMgmtSession.findTaskInstancesByIds");
        query.setParameterList("taskInstanceIds", taskInstanceIds);
        result = CollectionUtil.checkList(query.list(), TaskInstance.class);
      }
      catch (Exception e) {
        handle(e);
        throw new JbpmException("couldn't get task instances by ids '" + taskInstanceIds + "'", e);
      }
    }
    return result;
  }
===

r4706
===
  public List findTaskInstancesByIds(List taskInstanceIds) {
    try {
      return session.getNamedQuery("TaskMgmtSession.findTaskInstancesByIds")
          .setParameterList("taskInstanceIds", taskInstanceIds)
          .list();
    }
    catch (HibernateException e) {
      handle(e);
      throw new JbpmPersistenceException("couldn't get task instances by ids '"
          + taskInstanceIds
          + "'", e);
    }
  }
===

The change was related to JBPM-2205 and removed the empty check because the method Collections.emptyList() is not supported in jdk1.4. But I think an equivalent empty check should be restored.