Hello,
When running our cocoon application on some systems, we run into a very
strange and hard to find problem. Our application uses cForms and a custom
flow engine to display these forms. In some cases, when the user submits the
form, the flow engine receives an empty request object. With empty I mean non
of the request parameters are present. I did not yet check for other
attributes. To make sure the error is not caused by our custom flow engine I
added this piece of debug code:
public class ThreadInterpreter extends AbstractInterpreter
implements Configurable, ContinuationsDisposer {
...
public void handleContinuation(String id, List params,
Redirector redirector) throws Exception {
Request r = ContextHelper.getRequest(avalonContext);
java.util.Enumeration enu = r.getParameterNames();
System.out.println("Request Parameters ("+r.hashCode()+
" interpreter 1):");
while (enu.hasMoreElements()) {
String name = (String) enu.nextElement();
System.out.println(name+": "+r.getParameter(name));
}
...
}
}
As you can see, this code is the first code to be executed when resuming a
continuation. It dumps all request parameters to the stdout. Most of the time
this produces the expected result, lots of parameters with values. However in
some rare occasions this does not produce any parameter at all. The
'handleContinuation' method is called directly from the sitemap in the same
way as with a normal javascript flow.
From what I can see some part of Cocoon or Tomcat is not thread safe and does
not fill the parameters of the request in time. It is very hard to reproduce
the problem and it seems to happen more on systems running Windows, than on
systems running Linux. Also the upgrade to jdk 1.5 increased the problem
significantly. Adding more debug code below this code sometimes makes the
problem go away, even before this extra code is executed.
Am I doing something wrong, or did I hit a serious bug in either Cocoon or
Tomcat?
Best regards,
Emond Papegaaij
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