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copied!<p>I ran into the same problem, when some of my tests went wrong, after having added a new dependency to the project. Wondering how could this return <strong>null</strong> when its API says it's impossible, I revised it again:</p> <blockquote> <p><em>"Obtain a new instance of a TransformerFactory. This static method creates a new factory instance This method uses the following ordered lookup procedure to determine the TransformerFactory implementation class to load: Use the javax.xml.transform.TransformerFactory system property. ... [lookup order] ... Once an application has obtained a reference to a TransformerFactory it can use the factory to configure and obtain transformer instances."</em></p> </blockquote> <p>So, I had a look at <strong>TransformerFactory API</strong>, too, and it says:</p> <blockquote> <p><em>"The system property that determines which Factory implementation to create is named "javax.xml.transform.TransformerFactory". This property names a concrete subclass of the TransformerFactory abstract class. If the property is not defined, a platform default is be used."</em></p> </blockquote> <p>As I mentioned, the problem started when I added a new dependency to the project: another project that processes XML documents/signatures. I deleted the dependency, ran the test (that failed with the dependency added) and retrieved the specific class of the TransformerFactory. I added the dependency back and ran the test again: it was a different class now. So, as I supposed, the lookup procedure was instantiating a wrong TransformerFactory implementation, finding it in the added jar.</p> <p>I didn't want to fix it adding another system property, so I changed the code like that:</p> <pre><code>private static final String TRANSFORMER_FACTORY_CLASS = "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl"; TransformerFactory factory = TransformerFactory.newInstance(TRANSFORMER_FACTORY_CLASS, null); //null for default ClassLoader </code></pre> <p>and everything worked fine.</p>

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