title: NullPointerException occuring when creating new instance for JAXBContext
body: <p>I got Null pointer exception when creating the instance of JAXBContext for unmarshalling.
  The below line is inside a function, which will be called each time when I upload a XML which needs to be unmarshalled.</p>
  
  <pre><code>JAXBContext jc = JAXBContext.newInstance("com.foo.bar");
  </code></pre>
  
  <p>After sometime it is started throwing NullPointerException.The exception itself is not clear. Please let me know if any of you come across this scenario.</p>
  
  <p>Exception trace:</p>
  
  <pre><code> java.lang.NullPointerException
      at javax.xml.bind.ContextFinder.find(Unknown Source)
      at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
      at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
      at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
  </code></pre>
  
  <p>I am using JDK 1.6.0_18 version. And for JAXB also I am using the JDK which has JAXB in it.</p>
  
  <p>Regards,
  Sakthi. S</p>