The minimum JDK/JRE version required to use OpenOffice.org features that require java is JDK/JRE version 1.3.1.
For full functionality, jdk/jre 1.4.0_02 or newer or jdk/jre 1.4.1_01 or newer is required
To use the XSLT filters with JDK 1.3.1 you should download the files xalan.jar and xml-apis.jar from Xalan website and crimson.jar from Crimson website. The files also need to be added to the OpenOffice.org classpath, this can be accomplished with Tools->options->OpenOffice.org->Security