title: Ubikload pack jmeter test fails
body: <p>When running my recording i get the following error:
  Error converting XML to GWTRPC format, message:class java.lang.ArrayIndexOutOfBoundsException:3, see logs for more</p>
  
  <p>Logs:</p>
  
  <pre><code>2016/05/25 09:28:12 ERROR - com.ubikingenierie.jmeter.plugin.gwt.preprocessor.GwtPreProcessor: Error converting XML to GWTRPC format, message:class java.lang.ArrayIndexOutOfBoundsException:3, see logs for more details, query:
  
  &lt;GwtRequest&gt;
  &lt;className&gt;com.stibo.portal.framework.client.rpc.LoginService&lt;/className&gt;
  &lt;parameters&gt;
  &lt;string&gt;username&lt;/string&gt;
  &lt;string&gt;password&lt;/string&gt;
  &lt;null/&gt;
  &lt;string&gt;http://testsystem.com/&lt;/string&gt;
  &lt;/parameters&gt;
    &lt;returnType&gt;com.stibo.portal.framework.client.security.UserCredentials&lt;/returnType&gt;
  &lt;method&gt;doLogin&lt;/method&gt;
  &lt;serializationPolicy&gt;175634C48105165283A8CE76F1923989&lt;/serializationPolicy&gt;
  &lt;gwtVersion&gt;7&lt;/gwtVersion&gt;
  &lt;moduleBaseUrl&gt;http://testsystem.com/test&lt;/moduleBaseUrl&gt;
  &lt;/GwtRequest&gt; java.lang.ArrayIndexOutOfBoundsException: 3
  at     com.ubikingenierie.jmeter.plugin.gwt.request.GwtRequestToXmlTransformerXStream.a(GwtRequestToXmlTransformerXStream.java:356)
  at com.ubikingenierie.jmeter.plugin.gwt.request.GwtRequestToXmlTransformerXStream.a(GwtRequestToXmlTransformerXStream.java:233)
  at com.ubikingenierie.jmeter.plugin.gwt.preprocessor.GwtPreProcessor.process(GwtPreProcessor.java:82)
  at org.apache.jmeter.threads.JMeterThread.runPreProcessors(JMeterThread.java:762)
  at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:419)
  at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
  at java.lang.Thread.run(Unknown Source)
  </code></pre>