You can look for the location for javacore within the file native_stderr.log.
look at the following locations for java core file:
- The location specified by the IBM_JAVACOREDIR environment variable if it is set.
- <WSAS_install_root> (for WebSphere Application Server V5.1)
or <WSAS_install_root>/profiles/<profile> (for WebSphere Application Server V6.0)
- The location that is specified by the TMPDIR environment variable, if set.
- The /tmp directory or on Microsoft Windows the location that is specified by the by the TEMP environment variable, if configured.