z/OS Diagnostic Data Collection and Analysis

22.3. WebSphere Application Server

WebSphere Application Server writes system messages to several general purpose logs. These include the JVM logs, the process logs, and the IBM service log.

The JVM logs are created by redirecting the System.out and System.err streams of the JVM to independent log files. WebSphere Application Server writes formatted messages to the System.out stream. In addition, applications and other code can write to these streams using the print() and println() methods defined by the streams. Some JDK™ built-ins such as the printStackTrace() method on the Throwable class can also write to these streams. Typically, the System.out log is used to monitor the health of the running application server. The System.out log can be ...