[jira] [Created] (NETBEANS-958) inexplicable "throwable method result is ignored" warning

["Alvin Thompson (JIRA)" <ji...@apache.org>]

Alvin Thompson created NETBEANS-958:
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             Summary: inexplicable "throwable method result is ignored" warning
                 Key: NETBEANS-958
                 URL: https://issues.apache.org/jira/browse/NETBEANS-958
             Project: NetBeans
          Issue Type: Bug
          Components: cnd - Editor
    Affects Versions: 9.0
         Environment: project JDK: 8
IDE JDK: 10
            Reporter: Alvin Thompson


I have the following code:

{{public Map<StandingOrderInfo, Throwable> sendStandingOrders() {}}
{{  Map<StandingOrderInfo, Throwable> out = new LinkedHashMap<>();}}
{{  List<StandingOrderInfo> standingOrders = getStandingOrdersThatNeedToRunNow();}}
{{  for (StandingOrderInfo standingOrderInfo : standingOrders) {}}
{{    try {}}
{{      sendStandingOrder(standingOrderInfo);}}
{{      out.put(standingOrderInfo, null); // warning here}}
{{    } catch (Exception ex) {}}
{{      // TODO: send emails}}
{{      logger.log(}}
{{        Level.SEVERE,}}
{{        "could not send standing order " + standingOrderInfo.standingOrder.getId() + " for "}}
{{ + standingOrderInfo.dayOfWeek + ", " + standingOrderInfo.dateRequested,}}
{{        ex}}
{{      );}}
{{      out.put(standingOrderInfo, ex); // warning here}}
{{    }}}
{{  }}}
{{  return out;}}
{{ }}}

Judging from the warning description, this warning shouldn't even apply to the method that's returning the Throwable, but rather the code that calls the method. In any case, the catch clause is clearly doing something with the exception. If the warning is intended behavior (that I don't understand), I don't see how the code above rises to the level of "probable bug". Can you please explain?

What's even more puzzling is that this similar but simpler code works:

{{ private Throwable foo() {}}
{{  try {}}
{{    Thread.sleep(0);}}
{{    return null;}}
{{  } catch (Exception ex) {}}
{{    return ex;}}
{{  }}}
{{ }}}

 



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