[Ws Wiki] Update of "FrontPage/WsFx/wss4jFAQ" by RonReynolds

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http://wiki.apache.org/ws/FrontPage/WsFx/wss4jFAQ

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  {{{org.apache.crimson.tree.ElementNode2}}}. In this case you use the Crimson parser.
  Please make sure that a full namespace aware parser is in the classpath, e.g. Apache
  Xerces. Of course this is also true for other parsers that do not support XML namespace.
+ 
+ There is also a NullPointerException you can get that doesn't contain "crimson" anywhere.
+ The top of the stack-trace looks like this: {{{
+ WSHandler: Signature: error during message procesing... 
+ Signature creation failed; nested exception is: 
+   java.lang.NullPointerException; nested exception is: 
+   org.apache.ws.security.WSSecurityException: ...: Signature creation failed; nested exception is: 
+   java.lang.NullPointerException
+   at org.apache.ws.axis.security.WSDoAllSender.invoke(WSDoAllSender.java:201)
+   at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
+  ...nested exception is: 
+   java.lang.NullPointerException
+   at org.apache.ws.security.handler.WSHandler.performSIGNAction(WSHandler.java:203)
+  ...
+ }}}
+ 
+ To determine what JAXP implementation is being loaded use the following code: {{{
+    System.out.println(javax.xml.parsers.DocumentBuilderFactory.newInstance());
+ }}}
+ and if the class name isn't {{{org.apache.xerces.jaxp.DocumentBuilderFactoryImpl}}} then the Xerces
+ jar isn't in your classpath (or it's being masked by the {{{javax.xml.parsers.DocumentBuilderFactory}}}
+ System property or another JAXP-enabled XML parser on the classpath or the {{{JRE/lib/jaxp.properties}}}
+ file).
  
  [[Anchor(debug)]]
  ==== Where can I change the debug level of wss4j? ====