what is segmantation fault (core dumped)
 

I installed JDK rpm and I export the classpath in profile
But now Whenever I try to
# javac
I get this error

# javac
Segmentation fault (core dumped)

What does it means? But when I reinstall the Jdk it says package already installed.

Please let me know.

This means the program you're trying to execute crashes.

Two possibilities:

1/ You do something wrong while trying to execute the program (configuration, command line options, ...). Read the documentation.

2/ The program doesn't work. Look for a patch or a new release.

what should I do now? What is the diff between rpm and binaries.
Should I try the JDK binary version.
Please tell me how can I install Jdk
:(

The RPM is just a packaged up version of the JDK binaries.

I've always had trouble with the Sun JDK, but the IBM JDK has worked perfectly for me everytime.

I'd suggest uninstalling the JDK then getting the IBM version from:

http://www.ibm.com/java/ or http://www.ibm.com/linux/

so which one should I download RPM or BINARIES. Why I am getting the segmentation error. Is it beacuse of jdk software, hardware, memory, CPU or installing prob.

If you have an RPM system then RPM if you don't then binaries.

I suspect your problem is just Sun strangeness which is why I suggested the IBM version,