Server returned HTTP response code: 500.. i need help

[hardc0d3r]

i have this applet that communicates with a servlet.. when the applet connects to the servlet, i get the Server returned HTTP response code: 500 error.. when i am testing in my own pc, everything is fine.. when i tried deploying it in a server, the error occurs.. i do not have any idea what is wrong..

i get the error in this line in my applet:

inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());

this is the method that conatins the line above:

    protected String myMethod(String fileName) {
        String doc = null;
        ObjectInputStream inputFromServlet = null;

        try {
            URL loadMapServlet = new URL(this.getCodeBase(), "loadMap?action=load&fileName=" + this.getCodeBase().toString() + fileName);
            URLConnection servletConnection = loadMapServlet.openConnection();
            inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
            doc = (String)inputFromServlet.readObject();
            inputFromServlet.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        return doc;
    }

here is the stack trace

java.io.IOException: Server returned HTTP response code: 500 for URL: http://mental_boi.s46.eatj.com/CityNavigator/loadMap?action=load&fileName=http://mental_boi.s46.eatj.com/CityNavigator/mapSpain.svg
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at edu.citynavigator.map.editor.MapEditor.loadMap(MapEditor.java:685)
	at edu.citynavigator.map.editor.MapEditor.init(MapEditor.java:130)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
	at java.io.StringReader.<init>(Unknown Source)
	at edu.citynavigator.map.editor.MapEditor.stringToSVG(MapEditor.java:703)
	at edu.citynavigator.map.editor.MapEditor.init(MapEditor.java:131)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

another question.. is it required to sign the applet when doing an applet servlet communication? if yes, is there a free, easy way of doing this?

[simon]

It's a bug I found this on internet
Bug ID: 4921144 java.io.IOException Server returned HTTP response code 500 for URL

[hardc0d3r]

there is no workaround? is there any other way to pass a serialized string?

[boy22]

if you use IE go to
Tools-- Internet options -- Advanced -- Show Friendly HTTP messages checkbox is unchecked. If the checkbox is checked, IE shows generic error page instead of actual error page returned by server.

[sathish_2111]

Error code 500 means - Internal server error....

I think your server has some problem. Make sure the URL to which you are accessing is running properly in the server ...

[junaidmohiuddin88]

Make sure that your web service use the xmlrpc reference this error occurred when the client & server are belong to different platform.

[r035198x]

Who wrote the code MapEditor.java ?
There is a Nullpointer at line 703.
Either debug and fix or consult the documentation to see what conditions cause that line to throw the N.P.E.

[pink123]

Hi,

I am geting the same error ,can you tell me how you resolved it.

Thanks,

[rolandopalermo]

What you have to do is implement the serializable interface in the class that will be sent.

implements Serializable

It worked for me!

[DarrylBurke]

rolandopalermo, stop posting to old long dead threads. That doesn't help anyone.

db