Hi,
I think I am getting stupid: I just spent a day trying to find out how best to
debug a project that is getting fairly complicated, in Java. I did not find out
how, so I am asking the question. Hopefully, somebody can give me a hint.
1. I am using Sun JDK 1.2.2 ("Java 2 Standard Edition JDK 1.2.2 RC1") on Linux
Red Hat 6.2 and my source files are spread out over a directory tree. Kernel is
2.2.14-12 and glibc is 2.1.3-15.
2. Sun's JDB works but stubbornly refuses to find my source files. Used either
with the option 'sourcepath .:mydirs' or with the JDB command 'use .:mydirs',
it fails to find the .java files and debugging is no fun like that.
When asked which sourcepath it uses, it always says: '.'.
3. I also have Sun's JDK 1.3 beta but it has the same JDB (99/06/11) and it
does not work at all. (Sun says so in its announcement).
4. I tried using gdb with a complex arrangement involving green threads:
export JAVA_HOME=$JAVA
export JAVA_COMPILER=NONE
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib/classes.zip
export LD_LIBRARY_PATH=\
$JAVA_HOME/jre/lib/$PROCESSOR/native_threads:\
$JAVA_HOME/jre/lib/$PROCESSOR/classic:\
$JAVA_HOME/jre/lib/$PROCESSOR:\
$LD_LIBRARY_PATH:
COMMAND="gdb $JAVA_HOME/bin/$PROCESSOR/native_threads/java"
When running, it give a lot of unwanted dumps of SIGQUIT scrolling over the
screen.
5. I did the same with native_threads: I gives a
(gdb) run
Starting program: /usr/local/jdk1.2.2/bin/i386/native_threads/java
[New Thread 18444 (manager thread)]
[New Thread 18437 (initial thread)]
[New Thread 18445]
[Switching to Thread 18445]
Program received signal SIGSYS, Bad system call.
0x400c7deb in __sigsuspend (set=0xbf7ffc94)
at ../sysdeps/unix/sysv/linux/sigsuspend.c:48
48 ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or directory.
6. Tried the IBM jikes debugger, but it will only run with JDK 1.1.6.
7. Saw that GNU has a new java compiler jcl and a simple HOWTO on how to use it
with gdb, but it will not compile even JDK 1.1 features like anonymous inner
classes.
I would be thankful to anybody who can spot my mistakes, or even better:
suggest how to do useful debugging of Java on Linux in my situation.
Kind Regards,
--
Kris Heyrman.
Ottergemsesteenweg 337, B-9000 Gent. Phone: +32.9.221.79.69
Mobile: +32.495.380.128
"L'an 0. On arrète tout, puis on réflechit. Et c'est pas triste."
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