How to call Web Start app from Web Start app?

Question

Is there a way to call another Java Web Start Application from a running
Java Web Start Application, possibly from a different JNLP file?
Could this be done in a way that there won't be another virtual machine
launched; i. e. that the started Application will run in the same virtual
machine as the calling one?
Cheers,
Tobias

Answer 1

Im not sure about running in the same Jvm however there are two ways I know of to start another jnlp app. I am using this to essentially restart my application however, you dont have to do that and can start another web application by either using BasicService.showDocument with the jnlp file ( should start a webs tart app) or usign runtime exec with javaws and the jnlp as the argument.
    String jnlpUrlString = "commpartnersapp.jnlp?COMPANY="+COMPANY_ID;
    try {
      try {
        // Lookup the javax.jnlp.BasicService object
        //get the codebase
        //This will work on both Unix and Windows
        BasicService basicService = (BasicService) ServiceManager.lookup(
            "javax.jnlp.BasicService");
        URL codeBaseURL = basicService.getCodeBase();
        log.config("basicService.getCodeBase()=" + codeBaseURL.toString());
        basicService.showDocument(new URL(codeBaseURL, jnlpUrlString));
      catch (UnavailableServiceException ue) {
        //here for testing purposes since we are not started from jnlp in IDE
        log.log(Level.SEVERE,
                "ClientFrame:jMenuItemResetUserId_actionPerformed", ue);
        //when we are in the development environment
        String codeBaseString = "http://compub.cms/web/webportal/soft/";
        //Note this will work on windows only, javaws always in path
        //see http://java.sun.com/developer/community/chat/JavaLive/2005/jl0301.html
        //works on windows
        String execString = "javaws " + codeBaseString + jnlpUrlString;
        log.config("execString = " + execString);
        Process application = Runtime.getRuntime().exec(execString);
      catch (MalformedURLException ex) {
        log.log(Level.SEVERE,
                "ClientFrame:jMenuItemResetUserId_actionPerformed", ex);
    catch (IOException ex1) { //runtime exec throws IOException
      log.log(Level.SEVERE, "ClientFrame:jMenuItemResetUserId_actionPerformed", ex1);
    //pass a false param to not store profile at end of shutdown
    this.shutdown(0, false);  //calls System.exit(0);R
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