NullPointerException in translet

[fackel]

Hi!
It's my first attempt to compile a XSLT stylesheet to a translet. My 
project consists of two XSLT stylesheets which both work fine when used 
in conjunction with Xalan-j 2.4.1 from the command line. Now I compiled 
both of them as translets and tried an invocation from a small Java 
program. Compiling the translets and the Java app worked fine. 
Transformations with one smaller translet works fine. The second 
translet, a much larger one (about 80 match templates and some 20 name 
templates), gives a NullPointerException. Here is the stack trace:

java.lang.NullPointerException
        at com.dosco.wiview.translets.Document.template$dot$1()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$24()
        at com.dosco.wiview.translets.Document.applyTemplates3()
        at com.dosco.wiview.translets.Document.template$dot$23()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$22()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$20()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$19()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$46()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$46()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$46()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$45()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.template$dot$31()
        at com.dosco.wiview.translets.Document.applyTemplates()
        at com.dosco.wiview.translets.Document.transform()
        at 
org.apache.xalan.xsltc.runtime.AbstractTranslet.transform(AbstractTra
nslet.java:497)
        at com.dosco.wiview.Transform.doTransform(Transform.java:195)
        at com.dosco.wiview.Transform.main(Transform.java:293)
Translet error(s): null

How do I "debug" this? Is there a way to say what's wrong with the 
stylesheet, or the program (or XSLTC)? Can I deduce the template for 
which this exception happens?

Hope anybody has a suggestion for me. Thanks in advance.
Franz

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