Invoking Servlet

bhangun · December 2, 2008, 3:41pm

Hi guys, i have this error when i was trying to invoke the servlet class: java.lang.NullPointerException ServiceServlet.doGet(ServiceServlet.java:32) javax.servlet.http.HttpServlet.service(HttpServlet.java:740) javax.servlet.http.HttpServlet.service(HttpServlet.java:853) i wondering it caused by missed configuration in web.xml, i do like this: ServiceServlet ServiceServlet ServiceServlet /ServiceServlet is it correct or there is another cause? is there anybody can help me please, thank’s before. regards, bhangun

bhangun · December 3, 2008, 11:24am

Hi guys,

sorry there is wrong configuration in web.xml, so this error is appear.
and so the error is solved. But i have another problem. Invoking servlet is success, but it doesn’t turn the value. So the value is always null.
And in the error log i got this error. I also has change the ACL to annonymous, but also Access Denied :

Can you find me the problem and solve it?
this is the snippet code that i used for:

public void doPost( HttpServletRequest request,
HttpServletResponse response)throws ServletException, IOException {
PrintWriter out = response.getWriter();
ServletContext ctx = getServletContext();
// Will show on IS level 8
ctx.log(“logging a string in the IS server log via the Servlet API”);
log.info(“Servlet logging at the IS level 4”);
log.debug(“Servlet logging at the IS level 8”);

    //passing parameter to variabel
    String param1 = "defaultnya";//+request.getParameter ("param1");
    String param2 = request.getParameter ("param2");
    
    // input
    IData input = IDataFactory.create();
    IDataCursor inputCursor = input.getCursor();
    IDataUtil.put( inputCursor, "inString", param1+param2 );
    IDataUtil.put( inputCursor, "language", "language" );
    IDataUtil.put( inputCursor, "country", "country" );
    IDataUtil.put( inputCursor, "variant", "variant" );
    inputCursor.destroy();

    // output
    IData     output = IDataFactory.create();
    try{
        output = Service.doInvoke( "pub.string", "toUpper", input );
    }catch( Exception e){}
    IDataCursor outputCursor = output.getCursor();
        String    value = IDataUtil.getString( outputCursor, "value" );
    outputCursor.destroy();

    out.println("nilai : "+value);
    // Get the concatenated String returned by the Service
    //String value = (String)IDataUtil.get( inputCursor, "value" );
    if (value!=null){
        out.println("<HTML>");
        out.println("<P>Integration Server service yang dipanggil <b>pub.string:toUpper</b> </P>");
        out.println("<UL>");
        out.println("<FONT COLOR=RED>");
        out.println("<LI>param1 = " + param1 + "</LI>");
        out.println("<FONT COLOR=BLUE>");
        out.println("<LI>param2 = " + param2 + "</LI>");
        out.println("<FONT COLOR=RED>");
        out.println("<LI>Service returned = " + value + "</LI>");
        out.println("</UL>");
        out.println("</html>");
        inputCursor.destroy();
    }else out.println("gak ada isinya");
}

thank’s before, nuhun (Sunda tribe expression = “thanks”).

regards,
bhangun