Hello there,
   To filter the tasks that a particular key, i use the following statement: 
DefaultProcessEngine.getProcessEngine().getTaskService().createTaskQuery().
            taskCandidateGroup(group).processVariableValueEquals(key, value).list();
Is there any way such that i can filter the tasks by using only the value, something like: 
DefaultProcessEngine.getProcessEngine().getTaskService().createTaskQuery().
            taskCandidateGroup(group).processVariableValueEquals(value).list();
Thanks in Advance,
Arun…