exception getMessage output with class name

Question

I m trying to fix an issue  in my application I have this code  try     object1 method1      catch Exception ex       JOptionPane showMessageDialog nulll   Error    ex getMessage         and the object1 would do something like that   public void method1          some code       throw new RuntimeException  Cannot move file        I get a messsage in my option pane like this  Error  java lang RuntimeException  Cannot move file  but I used getMessage and not toString method  so the name of the class shouldn  t appear  right   What I am doing wrong  I already tryied with a lot of exceptions  even Exception itself  I m looking to solve this no without the need to implement my own Exception subclass  PROBLEM SOLVED - thank you all    The try and catch were actually being called in get   method from SwingWorker which constructs an ExecutionException with my exception thrown from doInBackground   I fixed doing this    Override protected void done         try           Object u    Object  get              do whatever u want       catch ExecutionException ex            JOptionPane showMessageDialog null   Error    ex getCause   getMessage           catch Exception ex            JOptionPane showMessageDialog null   Error    ex getMessage

User · Accepted Answer

I think you are wrapping your exception in another exception (which isn't in your code above). If you try out this code:

public static void main(String[] args) {
    try {
        throw new RuntimeException("Cannot move file");
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(null, "Error: " + ex.getMessage());
    }
}

...you will see a popup that says exactly what you want.

However, to solve your problem (the wrapped exception) you need get to the "root" exception with the "correct" message. To do this you need to create a own recursive method getRootCause:

public static void main(String[] args) {
    try {
        throw new Exception(new RuntimeException("Cannot move file"));
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(null,
                                      "Error: " + getRootCause(ex).getMessage());
    }
}

public static Throwable getRootCause(Throwable throwable) {
    if (throwable.getCause() != null)
        return getRootCause(throwable.getCause());

    return throwable;
}

Note: Unwrapping exceptions like this however, sort of breaks the abstractions. I encourage you to find out why the exception is wrapped and ask yourself if it makes sense.

User · Answer

My guess is that you ve got something in method1 which wraps one exception in another  and uses the toString   of the nested exception as the message of the wrapper  I suggest you take a copy of your project  and remove as much as you can while keeping the problem  until you ve got a short but complete program which demonstrates it - at which point either it ll be clear what s going on  or we ll be in a better position to help fix it   Here s a short but complete program which demonstrates RuntimeException getMessage   behaving correctly   public class Test       public static void main String   args            try               failingMethod              catch  Exception e                System out println  Error      e getMessage                                 private static void failingMethod             throw new RuntimeException  Just the message              Output   Error  Just the message

[java] exception.getMessage() output with class name

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