Remote debug using JPDA1.0

Question

I use jpda1.0 for remote debug in ias1.0 for aix4.3.3. When i set PATH and LIBPATH env variable as online doc said, and using httpdsctl start to start service, it gave me error as following:
httpdsctl[88]: 65626 Segmentation fault(coredump)
httpdsctl start: httpd could not be started
wait for your reply

Answer 1

Hi Ralph
I have had a similar problem, remote debugging on AIX. Unfortunately this turns out to be some rather nasty bugs in the JDPA/Java implementation on AIX. In the following I am giving you 2 easy examples to reproduce it. I'd be very interested to hear from you afterwards, if you get the same results. So, as it turns out, it's nothing to do with IAS, but with IBM's Java implementation on AIX.
Best regards,
Lars
----------------------- Examples: ---------
The following 2 scenarios demonstrates errors in JDPA/AIX: (debugging)
------- Scenario 1:
1. javac -g debugTest.java
2. jdb -tclassic debugTest
3. stop at debugTest:5
4. run
5. cont
* Observe! On AIX the program finishes after the first 'cont'. This is not correct behaviour.
On Windows 'cont' is executed 3 times, stopping at the breakpoint which is correct behaviour.
public class debugTest {
public static void main(String args[]) {
System.out.println("Here we go..");
for (int i = 0; i < 3; i++)
System.out.println("Hej igen...");
------- Scenario 2:
1. javac -g debugTest2.java
2. jdb -tclassic debugTest2
3. stop at debugTest2:3
4. run
5. Step
* Observe! On AIX it stops incorrectly in 'java.io.PrintStream.ensureOpen()'.
On Windows it stops correctly in 'debugTest2.main(), line=4'.
Executing the 'threads' command, it can be seen that "Signal dispatcher cond. wait".
On Windows it's "Signal dispatcher running". I'm not sure, but this could be a bug.
Executing the 'where' command on Windows it can be seen that it stops correctly in the
sourcecode. On AIX it "goes too far" and is in a java.io statement.
6. step
7. step
* Observe! AIX now core-dumps!
public class debugTest2 {
public static void main(String args[]) {
System.out.println("Here we go..");
System.out.println("Line 1");
System.out.println("Line 2");
System.out.println("Line 3");
System.out.println("Line 4");
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