Adding logging and tracing to your application
You can add logging and tracing to applications to help analyze performance and diagnose problems in WebSphere® Application Server.
About this task
Designers and developers of applications that run with or under WebSphere Application Server, such as servlets, JavaServer Pages (JSP) files, enterprise beans, client applications, and their supporting classes, might find it useful to use Java logging for generating their application logging.
System.out.println
statements to your
code:- Your messages are displayed in the WebSphere Application Server standard log files, using a standard message format with additional data, such as a date and time stamp that are added automatically.
- You can more easily correlate problems and events in your own application to problems and events that are associated with WebSphere Application Server components.
- You can use the WebSphere Application Server log file management features.
- You can view your messages with the Log and Trace Analyzer tool.
Procedure
Example
The sample security policy that follows grants access to the file system and runtime classes.
Include this security policy, with the entry permission java.util.logging.LoggingPermission
"control"
, in the META-INF directory of your application if you want your applications to
programmatically alter controlled properties of loggers and handlers. The META-INF file is located
in the following locations for the different module types:
Project name | Location |
---|---|
EJB projects | ejbModule/META-INF/MANIFEST.MF |
Application client projects | appClientModule/META-INF/MANIFEST.MF |
Dynamic web projects | WebContent/META-INF/MANIFEST.MF |
Connector projects | connectorModule/META-INF/MANIFEST.MF |
The following example security policy grants permission to modify logging properties:
//////////////////////////////////////////////////
//
// WebSphere Application Server Security Policy
//
//////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Allow all access to the file system and runtime classes
////////////////////////////////////////////////////////////////////////
grant codeBase "file:${application}" {
permission java.util.logging.LoggingPermission "control";
};