Bug 90870

Comment 1 Darin Wright 2005-04-11 09:38:59 EDT

Deferred

Comment 2 Darin Wright 2007-06-12 14:40:21 EDT

Could also benefit from this pending feature: "Add a method filter to MethodEntryRequest and MethodExitRequest"

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6447614

Comment 3 Denis Roy 2009-08-30 02:21:04 EDT

As of now 'LATER' and 'REMIND' resolutions are no longer supported.
Please reopen this bug if it is still valid for you.

Comment 4 Markus Keller 2013-05-27 13:21:12 EDT

Reopening, request is still valid.

I just wanted to use a MethodExit breakpoint on java.util.Arrays#sort(Object[]) to find broken compare implementations. But it was unusably slow, probably due to the abundance of calls to Arrays#copyOf(..).

Fortunately, I could reuse the breakpoint condition and just use it in line breakpoints at the end of java.util.ComparableTimSort#sort(Object[], int, int) and on the early returns of that method. That performed well.

Object[] sorted= arg0;
int l = sorted.length;
for (int i= 0; i < l; i++) {
    for (int j= 0; j < l; j++) {
        Comparable oi= (Comparable) sorted[i];
        Comparable oj= (Comparable) sorted[j];
        int c= oi.compareTo(oj);
        if (i < j) {
            if (c > 0 || c == 0 && !oi.equals(oj)) {
            	System.out.println(i+","+j+","+c+ "\n"+oi + "\n"+oj);
            	return true;
            }
        } else if (i == j) {
            if (c != 0) {
            	System.out.println(i+","+j+","+c+ "\n"+oi + "\n"+oj);
            	return true;
            }
        } else {
            if (c < 0 || c == 0 && !oi.equals(oj)) {
            	System.out.println(i+","+j+","+c+ "\n"+oi + "\n"+oj);
            	return true;
            }
        }
    }
}
return false;

Comment 5 Jan Poganski 2013-07-12 09:24:17 EDT

I can confirm that code is executed many times slower when a method exit breakpoint is used.

Today I wanted to debug a void method which was ending with a for loop. As there was no statement after the loop where I could have set a checkpoint I decided to set a method exit breakpoint. The performance of the method slowed down so much that I even restarted my machine because I could not explain what was going on. During the next debug session I was waiting once more for the loop to finish an I decided to deselect the Exit property of the breakpoint. Immediately the loop completed. This gave me a hint to search for this bug report.