Process logs

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.

[AIX Solaris HP-UX Linux Windows] 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.

[IBM i] 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.

Important: If you turn on the debugging service or verbose Java logging, the size of the native_stderr.log and native_stdout.log files increase in size with each restart of the application server. This situation can cause application server crashes especially on Linux® operating systems where you might have a 2 gigabyte maximum file size. To prevent this problem, consider redirecting the Java exceptions and verbose Java garbage collection to other files.

[Linux] 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.