Tracing and Logging
Tracing and Logging includes the following topics:
Tracing is a facility to redirect any output in the Java Console to a trace file.
Tracing can be turned on by enabling the property
However, it turns on all tracing facilities inside Java Plug-in. To enable more
javaplugin.trace.option may be used. You
can set trace-level options (0-5) in the Java
Console, shown in the previous chapter, with the following meanings:
This enables tracing on the fly.
Another way to set fine-grained tracing is through the Java Control Panel. For instance, to enable tracing for everthing (option 5 above), enter the following in the "Java Run Time Parameters" textfield:
Tracing set through the Control Panel will take effect when the Plug-in is launched, but changes made through the Control Panel while a Plug-in is running will have no effect until restart.
To set the initial trace level for a Java Web Start application, you can create a
.javawsrc file in either your home directory or the
directory. This file can have entries:
Similar to tracing, logging is a facility to redirect any output in the Java
Console to a log file using the Java Logging API. Logging can be turned on by
enabling the property
By default the trace and log file names are, respectively:
However, you can give them different names by setting the properties:
in the Java Plug-in Control Panel.
The default location (directory) of Java Plug-in related files is:
However, the location can be set with the environment variable
Furthermore, if you do not want to overwrite trace and log files each session,
you can set the property
If the property is set
false, then trace and log files will be
uniquely named for each session. E.g., if default trace and log file names are
used as shown above, then date information would be included as follows:
.plugin<username><date hash code>.traceand
.plugin<username><date hash code>.log