Gonzalo Lazaro [http://community.jboss.org/people/gonlafer] created the discussion "java.lang.NullPointerException on Notification sent" To view the discussion, visit: http://community.jboss.org/message/562363#562363 -------------------------------------------------------------- Hello, I've got the following problem using JBPM 4.4: I have a flow started and the first task assignee is set as a process variable in the following way: <task g="196,322,132,52" name="Submit adjustment for approval" candidate-groups="AdjustmentsInitiator" assignee="#{initiator}">       <notification/>       <reminder duedate="1 hour" repeat="1 hour"/>       <transition g="-64,-12" name="submit" to="change_status_to_submitted"/>       <transition g="-155,-18" name="cancel" to="change_status_to_cancelled"/>    </task> This is working perfectly and the assignee get a mail advising on the task assignment. However, if the assignee releases the task (ts.assignTask(taskId, null);) I get the following error: java.lang.NullPointerException     at org.jbpm.pvm.internal.email.impl.MailProducerImpl.tokenizeActors(MailProducerImpl.java:148)     at org.jbpm.pvm.internal.email.impl.MailProducerImpl.fillRecipients(MailProducerImpl.java:194)     at org.jbpm.pvm.internal.email.impl.MailProducerImpl.fillRecipients(MailProducerImpl.java:166)     at org.jbpm.pvm.internal.email.impl.MailProducerImpl.produce(MailProducerImpl.java:82)     at org.jbpm.jpdl.internal.activity.MailListener.notify(MailListener.java:58)     at org.jbpm.pvm.internal.model.op.ExecuteEventListener.perform(ExecuteEventListener.java:81)     at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:672)     at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:632)     at org.jbpm.pvm.internal.model.ExecutionImpl.fire(ExecutionImpl.java:579)     at org.jbpm.pvm.internal.model.ExecutionImpl.fire(ExecutionImpl.java:568)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) .... Is there any way to remove the task assignment without the notifications being sent? The test I've done is quite simple: @Test     public void testReAssignTask() {         TaskService ts = processEngine.getTaskService();         String taskId = "490009";         Task task = ts.getTask(taskId);         logger.debug(task.getAssignee());         ts.assignTask(taskId, null);     } Thanks, Gonzalo -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/562363#562363] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]