Reusing TransformerHandler

Hi!
I've been taking a look at the JAXP, Xalan etc. and have written a sample application to mirror work that was previously done using command line XSLT processors and XML tools.
The basic idea is a common one - to build a configurable chain of document processing steps including XSLT transformations.
However, I've run into a problem regarding the resuse of Transformers. Currently, the test application creates a vector containing a number of steps. These range from input steps (using org.xml.sax.XMLReader) to output steps (using org.apache.xml.sax.Serializer.)
Each transformation step is a TransformerHandler which is linked to the next step using setResult. Pretty much the same as Pipe.java from the Xalan samples.
Everything is fine for the first document to pass through the chain, however, trying to pass another document through the chain results in the following exception:
java.lang.RuntimeException: java.lang.NullPointerException
     at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3407)
     at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:433)
     at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
     at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
     at org.apache.xerces.impl.XMLEntityManager$EntityScanner.load(Unknown Source)
     at org.apache.xerces.impl.XMLEntityManager$EntityScanner.skipSpaces(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
     at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
     at com.mytest.ResourceProcessor.Input.readAndTransform(Input.java:64)
     at com.mytest.ResourceProcessor.Target.build(Target.java:111)
     at com.mytest.ResourceProcessor.ResourceProcessor.buildTargets(ResourceProcessor.java:110)
     at com.mytest.ResourceProcessor.TestApp.main(TestApp.java:24)
Now, this is probably a simple error due to my misunderstanding of the APIs (be kind - I'm new to this!)
What exactly are the rules for reuse of a TransformerHandler?
Thanks in advance for any help.

Reuse of Transformer (your question near the beginning) or reuse of TransformerHandler (your question near the end)?
I don't see any point in reusing a TransformerHandler, since it costs essentially nothing to create a new one. So don't bother. Reusing a Transformer is more conceivable, since creating one requires parsing the XSL it uses. But the rules for reusing them are clearly stated in the API documentation:
"An object of this class may not be used in multiple threads running concurrently. Different Transformers may be used concurrently by different threads.
A Transformer may be used multiple times. Parameters and output properties are preserved across transformations."
If there is a chance of multi-threading (for example if your code is in a servlet environment or similar) then a Templates object is both reusable and thread-safe.

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>
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