Investigating the logging and tracing output for the application
server is an excellent way to observe performance, diagnose problems,
and gain a general understanding of how the application server is
working within your environment. The expected output locations for
logging and trace information can be different depending on the operating
system on which the application server is running.
New feature: This topic
references one or more of the application server log files. Beginning
in WebSphere Application Server Version 8.0 you can configure the
server to use the High Performance Extensible Logging (HPEL) log and
trace infrastructure instead of using
SystemOut.log ,
SystemErr.log,
trace.log,
and
activity.log files or native z/OS logging
facilities. If you are using HPEL, you can access all of your log
and trace information using the LogViewer command-line tool from your
server profile bin directory. See the information about using HPEL
to troubleshoot applications for more information on using HPEL.
newfeat
Table 1. Log and trace
output for distributed and IBM® i. This table lists the expected output for logging and tracing
output streams for distributed and IBM i
operating systems
Log or trace stream |
Expected output - basic log and trace mode |
Expected output - HPEL log and trace mode |
Java trace |
Trace.log. You must have tracing enabled. |
- HPEL trace repository.
- HPEL TextLog*.log, when you enable this log.
|
Java logs |
- Trace.log, when you enable tracing.
- Activity.log. The Activity.log file is also directed to the Showlog
output.
- SystemOut.log
|
- HPEL log repository
- HPEL TextLog*.log, when you enable this log.
|
System.out stream |
|
- HPEL log repository
- HPEL TextLog*.log, when you enable this log.
|
System.err stream |
SystemErr.log |
- HPEL log repository
- HPEL TextLog*.log, when you enable this log
|
cout (the C or C++ output stream) |
Native stdout |
Native stdout |
cerr (the C or C++ error stream) |
Native stderr |
Native stderr |
Distributed and IBM i
- Basic log and trace mode

Distributed and IBM i - HPEL log and trace mode

z/OS® - Traditional log
and trace mode

z/OS - HPEL log and trace
mode
