JAXB gives me: java.lang.IllegalArgumentException: is parameter must not be null

Question

I am doing using JAXB to unmarshall some XML into Java objects:

My code looks a little like this:

InputStream testMsg = getClass().getResourceAsStream("TestDocumentEvent.xml");
Unmarshaller unmarshaller = JAXBContext.newInstance(DocumentEvent.class).createUnmarshaller();
DocumentEvent unmarshalled = (DocumentEvent) unmarshaller.unmarshal(testMsg);

However, when I run this code I get an exception:

java.lang.IllegalArgumentException: is parameter must not be null

What's going on?

Answer 1

This is because the InputStream you are passing to the unmarshaller ('is' parameter, geddit) is null, check that the resource name is correct.