title: What happened to JAXB's NamespacePrefixMapper in JDK6u18
body: <p>I've been using <code>com.sun.xml.bind.marshaller.NamespacePrefixMapper</code> in my project, and i had no problem with it in JDK 6u17. Now I just updated to 6u18, and I saw that it has been replaced to <code>com.sun.xml.internal.bind.marshaller.NamespacePrefixMapper</code>. However if I import this class and try to compile my classes, I get the error:</p>
  
  <pre>
  package com.sun.xml.internal.bind.marshaller does not exist
  import com.sun.xml.internal.bind.marshaller.NamespacePrefixMapper;
  </pre>
  
  <p>I can access this package through the NetBeans code completion feature, and NetBeans does not highlight the code for errors.</p>
  
  <p>Any help would be appreciated!</p>