For example, you can replace Xalan with SAXON for your XSLT processor:

1. Locate your the 'lib/ext' directory of your JDK. On the mac, this is under '/System/Library/Frameworks/JavaVM.framework/'.

2. Copy the saxon.jar file to that directory.

3. Restart Netbeans (or other Java application).

The replaces the XSLT processor for all Java applications that use that JDK or VM.