java.io.IOException: Server returned HTTP response code: 500 for URL

Hi

I have an application running in the server and another application calls that servlet. And both the applications are in different servers. It runs perfectly fine from my system, but when I login into another system and try running the application, it does not work. Could any one please let me know why would that strange behaviour happen.

The servlet code is,
PrintWriter out;
res.setContentType("text/html");
out = res.getWriter();
Connection connection = null;
try {
InputStream input = req.getInputStream();
connection = getConnection();
XMLParser.parseXml(connection, new InputSource(input));
connection.commit();
} catch (Exception e) {

This is the error I get

2006-12-01 13:46:33,660 ERROR [AWT-EventQueue-0] container.URLPost ( URLPost.java:74) - java.io.IOException: Server returned HTTP response code: 500 for URL: http://url:7001/proj/Submit
java.io.IOException: Server returned HTTP response code: 500 for URL: http://url:7001/proj/Submit
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at com.comp.proj.application.container.URLPost.doPostData(URLPost.java:59)
at com.comp.proj.application.container.SummaryPanel.processSubmit(SummaryPanel.java:631)
at com.comp.proj.application.container.SummaryPanel.access$400(SummaryPanel.java:58)

Appreciate all your help
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