When you are working with pseudo web services (without a WSDL and not REST) is useful to log the content of the response. 

The following code does the trick:

import org.apache.commons.io.input.TeeInputStream;
(...)

private static final Logger LOG = Logger.getLogger(AbstractWebServiceClient.class);

(...)
InputStream responseStream = response.getEntity().getContent(); //We get the inputStream that we want to log.
try {
  if (LOG.isDebugEnabled())
  {
    responseStream = new TeeInputStream(responseStream, new ByteArrayOutputStream() {
      @Override public void close() throws IOException
      {
        LOG.debug("Received response: " + this.toString());
        super.close();
      }
     }, true); //We close the outputstream when the original responseStream is closed.
  }
  return pResponseParser.parse(responseStream); //We work with the response.
} finally {
  responseStream.close(); //We make sure that the stream is always close.
}

The TeeInputStream class in part of the Commons IO package which I usually find in my projects. I am currently using version 2.1

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