How to debug Java adventure with jdb

Question

Hi,
I'm learning J2ee and I'd like to use and debug
Java adventure. I tried to find some information but found nothing.
What I tried to debug , is to start the j2ee server by adding the following options into the bin/asadmin.bat file:
-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
This it doesn't work because the j2ee server is started with the javaw.exe virtual machine. So I'm stuck here.
My first question: 1- what visual debugger is great to debug J2ee apps ??
I'd like to known what are the steps to:
2- how to start the j2ee server in order to attach the jdb or a visual
debugger ?
3- when starting the j2ee server, what do i have to do in order to step
into the code source of Java adventure and follow function calls ?
4- how do I have to start the jdb to attach to the J2ee server ?
5- Any useful tip to debug J2ee apps ! :-)
Thanks in advance !
Waltereo

Answer 1

Hi,Hello
I'm learning J2ee and I'd like to use and debug
Java adventure. I tried to find some information but
found nothing.
What I tried to debug , is to start the j2ee server by
adding the following options into the bin/asadmin.bat
file:
-Xdebug
ug
-Xrunjdwp:transport=dt_socket,address=8000,server=y,sus
end=nThat looks OK.
This it doesn't work because the j2ee server is
started with the javaw.exe virtual machine. So I'm
stuck here.javaw.exe implies you are on a win32 machine. The default
debugging transport on win32 is shared memory... but you specify
a socket connection on the debugee command line above. This
means you need to specify sockets on the debugger side as well.
For example:
jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8000
Note the port number (8000) matches the value you specified
when starting the debugee.
>
My first question: 1- what visual debugger is great
to debug J2ee apps ??For a list of debugging tools, check this web page:
http://java.sun.com/products/jpda/using.html
Many of these products work well in a J2EE environment.
Most of them are either free, or come with an introductory
"try before you buy" offer.
I'd like to known what are the steps to:
2- how to start the j2ee server in order to attach
the jdb or a visual
debugger ?You are on the right track with the flags/options you
mentioned.
3- when starting the j2ee server, what do i have to
do in order to step
into the code source of Java adventure and follow
low function calls ?The code you want to examine needs to be compiled
with the "-g" flag added to the javac command line.
When -g is specified, javac will save information
in the .class files that is used later during debugging.
4- how do I have to start the jdb to attach to the
J2ee server ?See above...
For more coverage on this topic, refer to:
JPDA Connection and Invocation Details
http://java.sun.com/j2se/1.4.2/docs/guide/jpda/conninv.html
5- Any useful tip to debug J2ee apps ! :-)That is a bit outside the scope of this forum... sorry.
Any useful tips will depend on what J2EE app server you
are using. Most of the well-known servers come with
a debugging guide. For example, take a look at:
Debugging J2EE Applications in the SunOne Application Server
documentation:
http://docs.sun.com/source/817-2171-10/dgdebug.html
Thanks in advance !Best Regards...