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Description
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The following simple class is a subclass of Panel. In the main
program, I create the panel and exit from main. When I run
this program, it hangs at the end and never exits.
package echeck.ofx;
import java.io.*;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
public class OFXTester extends Panel
{
/**
* Constructor initializes this customer .
*/
public OFXTester()
{
}
public static void main(String [] args)
{
int active = Thread.activeCount();
System.err.println("active = " + active);
Thread[] threads = new Thread[active];
Thread.enumerate(threads);
System.err.println("before construction");
for (int j=0; j<threads.length; j++) {
System.err.println(threads[j].toString());
}
System.err.println("doing nothing!!");
OFXTester test = new OFXTester();
active = Thread.activeCount();
System.err.println("active = " + active);
threads = new Thread[active];
System.err.println("after contruction");
Thread.enumerate(threads);
for (int i=0; i<threads.length; i++) {
System.err.println(threads[i].toString());
}
System.err.println("done!!");
}
}
The standard error for this program is given below. It includes a full dump of all the threads which is created when I hit "Ctrl-\" when the program is hanging.
active = 1
before construction
Thread[main,5,main]
doing nothing!!
active = 4
after contruction
Thread[main,5,main]
Thread[AWT-EventQueue-0,5,main]
Thread[AWT-Input,5,main]
Thread[AWT-Motif,5,main]
done!!
SIGQUIT 3* quit
Full thread dump:
"AWT-Motif" (TID:0xee308748, sys_thread_t:0x1d6b00, state:CW) prio=5
at java.lang.Object.wait(Native Method)
at sun.awt.motif.MToolkit.run(Native Method)
at java.lang.Thread.run(Thread.java:490)
"AWT-Input" (TID:0xee308770, sys_thread_t:0x1cdde0, state:CW) prio=5
at sun.awt.motif.InputThread.run(Native Method)
"AWT-EventQueue-0" (TID:0xee308578, sys_thread_t:0x1b4c70, state:CW) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:315)
at java.awt.EventQueue.getNextEvent(EventQueue.java:122)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:44)
"SoftReference sweeper" (TID:0xee3046c8, sys_thread_t:0x89528, state:CW) prio=9
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:315)
at java.lang.Runtime.waitForMemoryAdvice(Runtime.java:569)
at java.lang.ref.SoftReference$Sweeper.run(SoftReference.java:524)
at java.lang.Thread.run(Thread.java:490)
"Finalizer" (TID:0xee300318, sys_thread_t:0x682a0, state:CW) prio=8
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:107)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:122)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:127)
"Reference handler" (TID:0xee3003c8, sys_thread_t:0x584b8, state:CW) prio=10
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:315)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:186)
"Async Garbage Collector" (TID:0xee3001b0, sys_thread_t:0x61160, state:CW) prio=1
"Idle thread" (TID:0xee3001f8, sys_thread_t:0x58910, state:R) prio=0 *current thr
ead*
"Clock" (TID:0xee3002d0, sys_thread_t:0x587e8, state:CW) prio=12
"main" (TID:0xee300038, stillborn) : <thread not active>
Monitor Cache Dump:
Registered Monitor Dump:
utf8 hash table: <unowned>
JNI pinning lock: <unowned>
JNI global reference lock: <unowned>
BinClass lock: <unowned>
Class linking lock: <unowned>
System class loader lock: <unowned>
Code rewrite lock: <unowned>
Heap lock: <unowned>
Monitor IO lock: <unowned>
Child death monitor: <unowned>
Event monitor: <unowned>
I/O monitor: <unowned>
Waiting to be notified:
"AWT-Input" (0x1cdde0)
Alarm monitor: <unowned>
Waiting to be notified:
"Clock" (0x587e8)
Sbrk lock: <unowned>
Thread queue lock: <unowned>
Waiting to be notified:
"main" (0x0)
Monitor registry: owner "Idle thread" (0x58910, 1 entry)
Thread Alarm Q:
sys_thread_t 0x1cdde0 [Timeout in 104 ms]
sys_thread_t 0x61160 [Timeout in 235 ms]
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