Does javax.xml.transform.Transfomer close its streams?

[Ziv Ben-Eliahu]

I have the following code:

{
        File outputFile = new File("out.xml");
        Result outputResult = new StreamResult(outputFile);
        
        
        File inputFile = new File("in.xml");
        Result inputSource = new StreamSource(inputFile);
        
        Transformer transformer = javax.xml.transform.TransformerFactory
             .newInstance().newTransformer("stylesheet.xsl");
        transformer.transform(inputSource, outputResult);
}
The default transformer instance is:
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl

After this code runs, I cannot delete the created "out.xml" file while 
JVM is running. If I use FileOutputStream instead of File, and close the 
stream myself, then I can delete the file.
It seems to me that the Java-1.5 default Transformer opens a stream and 
does not close it.
Anyone knows if there is a different reason?
If no, do you know a non-default Transformer that closes the stream 
(rather than creating a stream myself).

Thanks, Ziv.