NullPointerException stack trace not available without debug agent

Question

I have recently found a bug that causes a NullPointerException. The exception is caught and logged using a standard slf4j statement. Abridged code below:

for         


        

Answer 1

I can replicate this but it seems kind of weird that this would be happening in your Action somewhere.

If you call setStackTrace with an empty array, that'll cause only the text to be shown.

 public class Fark {
   public static void main(String[] args) {
       try {
           Fark.throwMe(args.length != 0);

       }
       catch (Exception e) {
           e.printStackTrace();
       }

   }

     public static final void throwMe(boolean arg) throws Exception{
         Exception e = new NullPointerException();
         if (arg) {
           e.setStackTrace(new StackTraceElement[0]);
         }
         throw e;
     }
 }

Running it....

% java Fark
java.lang.NullPointerException
        at Fark.throwMe(Fark.java:15)
        at Fark.main(Fark.java:5)

% java Fark nothing
java.lang.NullPointerException