Garbage collector: Out of memory (when running AWT/SWING code on arm-linux)

Fri Jun 6 16:45:00 GMT 2008

ffileppo wrote:
>> Hi guys,
>>>> I'm getting the following error:
>>>> GC Warning: Out of Memory! Returning NIL!
>>>> when I try to run any AWT/SWING code compiled with arm-linux-gcj on my embedded box (PXA270 - 128MB Ram). (Other code just runs fine)
>>>> For example this code:
>>>> import javax.swing.*;
>>>> public class SimpleFrame {
>> public static void main(String args[]) {
>> System.out.println("Check 1");
>> JFrame f = new JFrame("Simple Frame");
>> System.out.println("Check 2");
>> f.setSize(200,100);
>> f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>> f.setVisible(true);
>> }
>> }
>>>> gives out of memory error after printing "Check 1".
>> Trying with some other code I can see that the first AWT/SWING call causes this error.
>>>> Any idea to fix / debug this problem?

I think I've found it. The unwinder is infinitely looping 'til it runs out
of memory.
Some library somewhere has probably has invalid unwind information.
Add this line to _Jv_StackTrace::UnwindTraceFn in stacktrace.cc:
*** stacktrace.cc~ Tue Sep 4 19:00:31 2007
--- stacktrace.cc Fri Jun 6 17:42:25 2008
***************
*** 110,115 ****
--- 110,117 ----
 // Check if the trace buffer needs to be extended.
 if (pos == state->length)
 {
+ return _URC_END_OF_STACK;
+
 int newLength = state->length * 2;
 void *newFrames = _Jv_AllocBytes (newLength * sizeof(_Jv_StackFrame));
 memcpy (newFrames, state->frames, state->length * sizeof(_Jv_StackFrame));
This will prevent more than 100 stack frames from being traced.
Andrew.