NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces

问题

Trying to retrieve the SOAP body from a SOAP response, but getting this error:

NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.

Document doc = soapResMsg.getSOAPBody().extractContentAsDocument(); -- Exception is thrown here
org.dom4j.io.DOMReader d4Reader = new org.dom4j.io.DOMReader();
org.dom4j.Document d4doc = d4Reader.read(doc);

Using Saaj1.4

What would be a fix for this?

回答1:

I faced the same problem. In my case, fix the problem on server side was not an option. I fixed it on client side forcing Xalan to version 2.7.0. See this.

回答2:

I had a similar issue with Flying Saucer. Following the advice from jddsantaella, I looked through my POM dependencies. The project I was using used Struts and under the covers struts had a dependency on Xalan 2.5.1.

I added the following to the POM in the struts dependency section:

<exclusions>
<exclusion>
    <artifactId>xalan</artifactId>
        <groupId>xalan</groupId>
</exclusion>
</exclusions>

Flying Saucer now works a treat.

Hope this helps.

回答3:

I solved this by making the DocumentBuilderFactory namespace aware:

DocumentBuilderFactory.setNamespaceAware(true)

回答4:

I had this exact problem myself and wasted a good half day on fixing it because of how vague the error message is. The problem is with your SOAP service (NOT the client implementation). It's throwing an error because there is a namespace issue with the XML you are sending to the client.

There are three possible reasons for the issue according to this article:

A null namespace prefix
A namespace prefix of "xml" that is not in the namespaceURI of "http://www.w3.org/XML/1998/namespace"
A namespace prefix of "xmlns" that is not in the namespaceURI of "http://www.w3.org/2000/xmlns/"

In my case it was #1 above that caused the problem. I wasn't returning the XML with a namespace. I fixed it by adding a namespace (the "ns" variable) to the root element and all child nodes like so:

  Namespace ns = Namespace.getNamespace("tns", "http://mycompany.com/schemas");

  Element result = new Element("ResponseType", ns);
  Document doc = new Document(result);

  result.addContent(new Element("StatusCode", ns).setText(code));
  result.addContent(new Element("Message", ns).setText(message));

It's important to note that my example code is for JDom, not Dom4j as the person was asking. You'll have to use the code appropriate for the XML library you happen to be using.