Run this command:
java com.sun.org.apache.xalan.internal.xslt.EnvironmentCheck
For me this outputs:
#---- BEGIN writeEnvironmentReport($Revision: 1.8 $): Useful stuff found: ----
version.DOM.draftlevel=2.0fd
java.class.path=.;C:\Program Files\Java\jre6\lib\ext\QTJava.zip
version.JAXP=1.1 or higher
java.ext.dirs=C:\Program Files\Java\jre6\lib\ext;C:\Windows\Sun\Java\lib\ext
version.xerces2=Xerces-J 2.6.2
version.xerces1=not-present
version.xalan2_2=Xalan Java 2.6.0
version.xalan1=not-present
version.ant=not-present
java.version=1.6.0_21
version.DOM=2.0
version.crimson=not-present
sun.boot.class.path=C:\Program Files\Java\jre6\lib\resources.jar;C:\Program Files\Java\jre6\lib\rt.jar;C:\Program Files\Java\jre6\lib\sunrsasign.jar;C:\Program Files\Java\jre6\lib\jsse.jar;C:\Program Files\Java\jre6\lib\jce.jar;C:\Program Files\Java\jre6\lib\charsets.jar;C:\Program Files\Java\jre6\classes
version.SAX=2.0
version.xalan2x=not-present
#----- END writeEnvironmentReport: Useful properties found: -----
# YAHOO! Your environment seems to be OK.
