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Using FileMon

FileMon is a free Windows utility that you can download from Its purpose is to show where a running application searches for the files that it needs, so it is useful for resolving problems with CLASSPATH settings.

To use FileMon, perform the following steps:

1. Run filemon.exe.

2. Set a filter for the file type in which you are interested. FileMon produces a lot of output; you probably want to set a filter to restrict the output to a more readable size. To set a filter, click the Filter button the in FileMon toolbar. For example, you can use the filter *\*.jsp to monitor all .jsp files that your application is trying to open.

3. If desired, save the output to a log file.

Note: You can also get information about the classes that load by using the JVM option ­verbose:class.