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In the config.xml file, there is an element called <log4j:configuration>. This element contains the XML style configuration information as defined in the log4j DOMConfigurator class. You can find examples here.

2.2. What is the meaning of BaseURI?

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The samples divide into two groups: Samples that create and samples that verify Signatures. Eventually, you should adjust the verifying program to another filename if you get FileNotFoundExceptions.

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Putting this JAR to another location like lib/ext WILL NOT WORK.

For more on that, you can also check the Unofficial JAXP FAQ.

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I get a NullPointerException, and I don't know what's wrong.

Often, this problem is caused by using DOM1 calls like createElement(), setAttribute(), createAttribute(). These are non-namespace-aware and will cause XPath and C14N errors. Always use the DOM2 create(Attribute|Element)NS(...) methods instead, even if you're creating an element without a namespace (in that case, you can use null as a namespace).

The Xalan-J Team told us that DOM1 calls are deprecated and are not to be used in code. xml-security has been reviewed and is DOM1 clean now. The Xalan folks told us that if you create Elements or attributes using DOM1 calls which are not namespace aware, they do not care about any problem you have because of incorrect hehaviour of Xalan.

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5. I sign a document and when I try to verify using the same key, it fails

After you have created the XMLSignature object, before you sign the document, you must embed the signature element in the owning document (using a call to XMLSignature.getElement() to retrieve the newly created Element node from the signature) before calling the XMLSignature.sign() method,

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