[jbpm-issues] [JBoss JIRA] Updated: (JBPM-2813) Do not throw exception from BusinessCalendar when calculated end date ends up in the past

Do not throw exception from BusinessCalendar when calculated end date ends up in the past ----------------------------------------------------------------------------------------- Key: JBPM-2813 URL: https://jira.jboss.org/browse/JBPM-2813 Project: jBPM Issue Type: Patch Security Level: Public(Everyone can see) Reporter: Per Christian Henden Fix For: jBPM 4.x Attachments: jbpm-2813-patch.diff The case where the subtract method is called with a duedate expression and reference date that resolves to a date in the past is handled by throwing a JbpmException ("duedate <date> ends in the past"). While this may sound like a good decision in theory, it is problematic in practice. As a user of the API it means I have two choices when calling the subtract method. I must either -resolve the calcuation myself- before calling the method, to avoid the exception, or I must catch the -generic- JbpmException and decide on a duedate myself not knowing what went wrong. When someone requests a date that is in the past in this way there's basically three options: 1) Let them have it. - This seems like a silly solution to me, duedates in the past doesn't make sense. 2) Throw an error. - In this case a specific exception should be thrown so that the user of the API can know why he got an exception. An alternative to today's solution is to throw a less generic exception, maybe 'DueDateIsInThePastException' or IllegalArgumentException. 3) Return the current date, i.e. return Clock.getTime(). - Optionally a warning that the date was overriden to not be in the past can be logged, but this seems unecessary to me. Attached patch implements alternative #3 (against trunk/revision 6208), which I believe is the best choice.