java_jail Not working in my linux machine

[dhananjayharel]

Hi,
I am using java_jail to install on my linux 64bit machine having cent OS 5.0 version
I used the same procedure which is given in readme file. just not added iptable
entry and It fails in both the cases when
1>run the java class InMemory by given java file as input parameter it gives null pointer exception.I think in run method of the "JSONTracingThread" JVM doesnt starts
2>in compile file given in java_jail/cp/traceprinter it is written that for testing use
following command "java traceprinter.JSONTrace Filename" but on running this it shows exception of class not found JSONTrace.
3>I have used safeexec and followed the same procedure what was given but after run it gives exception of file not found execve error

I did the same thing except one thing of IPTABLES setting.
so I want to ask
is it showing null pointer exception because of blocking of port which JVM is using while running
OR other reason?

thanks

[daveagp]

Did you ever get this working? I have been diagnosing a related problem recently.