WebSphere® Application Server processes contain two output streams that are accessible to native code running in the process. These streams are the stdout and stderr streams. Native code, including Java virtual machines (JVM), might write data to these process streams. In addition, JVM provided System.out and System.err streams can be configured to write their data to these streams also.
By default, the stdout and stderr streams are redirected to log files at application
server startup, which contain text written to the stdout and stderr streams by native modules (.dlls, .exes, UNIX libraries, and other modules).
By default, these files are stored as profile_root/logs/server_name/native_stderr.log and profile_root/logs/native_stdout.log.
By default, the stdout and stderr streams are redirected to log files at application
server startup, which contain text written to the stdout and stderr streams by native modules (*SRVPGMs, .dlls, .exes, UNIX
libraries, and other modules). By default, these files are stored
as profile_root/logs/server_name/native_stderr.log and profile_root/logs/native_stdout.log.
You can increase
the maximum file size beyond the 2 gigabyte file size limit if you
enable Large File Support (LFS). For more information, see your operating
system documentation.