JDB Is Flat Broken

Question

I'm a novice java programer learning to use jdb. No matter what program i throw into jdb I get the same error; be it as root or my regular user "pat" and with or without breaks set via the "stop at" command I always get this> run
run students
VM start exception: VM initialization failed for: /opt/sun-jdk-1.5.0.01/jre/bin/java -Xdebug -Xrunjdwp:transport=dt_socket,address=gentoo:32781,suspend=y students
ERROR: transport error 202: connect failed: Connection refused ["transport.c",L41]
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510) ["debugInit.c",L497]
JDWP exit error JVMTI_ERROR_INTERNAL(113): No transports initializedFATAL ERROR in native method: JDWP No transports initialized, jvmtiError=JVMTI_ERROR_INTERNAL(113)
Fatal error:
Target VM failed to initialize.It seams to be an issue with the VM, any input would be much apreiciated; and yes... I've compiled all programs which I've tried to put through jdb with "javac -g".

Answer 1

Hello,
I got the same error under Eclipse 3.2.2 - but Windows OS.
However, just modifying the +/etc/hosts+ (under Windows this should
be +%WINDIR%\system32\drivers\etc\hosts+) in the proposed way did not help.
I guess there is an additional mysterical relationship between using the remote debugger and setting of the PATH variable in Eclipse under "Run - Debug - Environment:" for a designated project:
When setting the PATH variable to the directory where my native layers (the JNI using code)
and setting the Radio Button "replace native environment with specified environment" I got the
error:
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=JVMTI_ERROR_INTERNAL(113)
+{color:#ff0000}
ERROR: transport error 202: gethostbyname: unknown host ["transport.c",L41]+
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510) ["debugInit.c",L497]
+JDWP exit error JVMTI_ERROR_INTERNAL(113): No transports initialized{color}+
However, wenn selecting the Radio Button to "append environment to native environment" then the debugger works!
So, I guess there are required some additional helper programs which need to be found by the debugger.
Therefore, replacing the complete PATH variable may remove the required path in the environment.
Additional information may be found also under :
http://wiki.eclipse.org/Debug_FAQ
Thanx
Peter