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Can't display applet from html using javascript code in Eclipse

I've tried to run a java applet using the javascript code in Eclipse IDE as shown in the web page Embedding Java Applet into .html file. But the output page shows error. My code to use applet is
<script src="//www.java.com/js/deployJava.js"></script>
in the head section and
<script>
var attributes = {
codebase : '../src/',
code : 'transfol.Main.class',
//archive: 'my-archive.jar',
width : '800',
height : '500'
};
var parameters = {
java_arguments : '-Xmx256m'
}; // customize per your needs
var version = '1.5'; // JDK version
deployJava.runApplet(attributes, parameters, version);
</script>
in the body section.
The way I've saved them is shown in the Navigator as
Main.class inside the package transfol which is in src folder (in Eclipse) and index.jsp in the web content
where Main.class is the applet and index.jsp is the file from which applet is being called.
I'm almost sure that the problem is in the codebase or code attributes where the path has to be specified, when I click on more information on applet, I get exception as:
The folloing exception has occured. For more information, try to launch the browser from the command line and examine the output.
For even more information you can visit http://icedtea.classpath.org/wiki/IcedTea-Web and follow the steps described there on how to obtain necessary information to file bug
Additional information may be available in the console or logs. Even more information is available if debugging is enabled.
Another available info:
IcedTea-Web Plugin version: 1.5 (1.5-1ubuntu1)
26/5/15 5:56 PM
Exception was:
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize applet. For more information click "more information button".
at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:746)
at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:675)
at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:908)
Caused by: java.lang.ClassNotFoundException: Can't do a codebase look up and there are no jars. Failing sooner rather than later
at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:716)
... 2 more
This is the list of exceptions that occurred launching your applet. Please note, those exceptions can originate from multiple applets. For a helpful bug report, be sure to run only one applet.
1) at 26/5/15 5:47 PM
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize applet. For more information click "more information button".
at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:746)
at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:675)
at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:908)
Caused by: java.lang.ClassNotFoundException: Can't do a codebase look up and there are no jars. Failing sooner rather than later
at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:716)
... 2 more

Try below code
<APPLET CODE=AppletSubclass.class WIDTH=anInt HEIGHT=anInt>
</APPLET>
OR
<object width="400" height="400" data="helloworld.class"></object>

Try this
Java applet
package cdig;
import java.applet.Applet;
import java.security.AccessController;
import java.security.PrivilegedAction;
public class CDigApplet extends Applet
{
private static final long serialVersionUID = 1L;
String ret;
CDigApplet applet = this;
#SuppressWarnings({ "rawtypes", "unchecked" })
public String signFile(String fileID, String pin, String token)
{
AccessController.doPrivileged(new PrivilegedAction()
{
#Override
public Object run()
{
try
{
System.out.println("Iniciando processo de assinatura.");
}
catch (Exception e)
{
String sl = "{\"success\":false," + "\"message\":\"" + e.getMessage() + "\"}";
ret = sl;
System.out.println(sl);
}
return null;
}
});
return ret;
}
public void init(){
}
public void destroy(){
}
}
HTML
<script>
<!-- applet id can be used to get a reference to the applet object -->
var attributes = { id:'cdigApplet', code:'cdig.CDigApplet', archive:'cdig-applet-1.0.jar', width:1, height:1, classloader_cache:'false'} ;
var parameters = {persistState: false, cache_option:'no' } ;
deployJava.runApplet(attributes, parameters, '1.8');
</script>
Call via javascript
var res = document.getElementById("cdigApplet").signFile(Id, '', token);
Don't forget to sign your applet and to not run your app with a URL with underscores '_' like this.

NanoHTTPD how to present variable from app

I play NanoHTTPD and WebServer based on it. To update any object in my code (application) I can use GET/POST method. But how can I create dynamic pages? For example I have html page on disc and it should present current temperature:
<html>
<head>
<title>My page</title>
</head>
<body>
<p style="text-align: center">Temperature: [temperature variable] </p>
</body>
</html>
How can I pass "variable temperature" from my application based on NanoHTTPD to html file and present it in browser?

You have to read the template from your disk, and replace the [temperature variable] substring with the value you want to include.
To read the file, you can use the Files class:
byte[] data = Files.readAllBytes(Paths.get("mytemplpate.html"));
String templ = new String(data, StandardCharsets.UTF_8);
To insert your temperature:
double temperature = 22.3;
String html = templ.replace("[temperature variable]", Double.toString(temperature));
And finally to send this as the response with NanoHTTPD:
return new NanoHTTPD.Response(html);
The complete program:
Foreword: Exceptions are not handled, this is just for demonstration purposes.
public class TemperatureServer extends NanoHTTPD {
// Loaded and cached html template
private static String templ;
// Value of this variable will be included and sent in the response
private static double temperature;
public TemperatureServer () {
super(8080);
}
#Override
public Response serve(IHTTPSession session) {
String html = templ.replace("[temperature variable]",
Double.toString(temperature));
return new NanoHTTPD.Response(html);
}
public static void main(String[] args) throws Exception {
byte[] data = Files.readAllBytes(Paths.get("mytemplpate.html"));
templ = new String(data, StandardCharsets.UTF_8);
ServerRunner.run(TemperatureServer.class);
}
}
For more advanced examples check out the Samples package of the NanoHttpd Github site.

Accessing uploaded file in Apache Tapestry page

I'm using Apache Tapestry v5.3.7 and I already use the normal Tapestry upload component in a form. For a better user experience I try now to integrate Dropzone.js in a normal Tapestry page without any form. The JavaScript integration works fine. The uploaded file data are transferred to my server with a post request and I can access the request with all of its parameters.
My question is now how can I access the binary data of the uploaded file (maybe as InputStream) to save them in my system? I already injected the http request but getInputStream returns a empty stream.
Thanks for any suggestions
/** Code snippet of page java part */
...
#Inject
protected HttpServletRequest _request;
public void onActivate (String rowId) {
String fileName=_request.getParameter("file");
try {
InputStream is=_request.getInputStream();
// if I do read from is it returns -1
// :-(
doSomeSaveStuff(is); // dummy code
}
catch(Exception e) {
e.printStackTrace();
}
}
...

Here's one way to do it:
In template:
<t:form t:id="testForm" class="dropzone">
</t:form>
In page.java
#Inject
MultipartDecoder multipartDecoder;
#Component(id = "testForm")
private Form testForm;
#Inject
RequestGlobals requestGlobals;
void onSubmitFromTestForm() throws ManagerException {
System.out.println("test form invoked");
HttpServletRequest r = requestGlobals.getHTTPServletRequest();
UploadedFile u = multipartDecoder.getFileUpload("file");
The uploaded file contains what you uploaded and you can work with it the way you want.
Note: the HttpServletRequest::getParameterMap() , told me that the handle to to the file is called file which is how I know that passing file to getFileUpload makes the decoder correctly parse the multipart/post

export to excel from web application is not working

I am having a very wierd issue and I'm hoping you can help me out
At work, we use a web application made with the framework GWT, and all the sales reports have an option to export the data to excel. It usually works fine, but the days that the report has more than about 15-20 thousand rows, the excel file only opens with the word "null" on the first cell.
Within the code, we use a JSP to send the data as html and a StringBuffer object to append all the text of the html. Here es the method that sends the html:
public void export(final String psFormat) {
manageStartOfCall();
String lsFileName = "resources/system/excel_file.jsp";
final DynamicForm loForm = new DynamicForm();
loForm.setAction(lsFileName);
loForm.setMethod(FormMethod.POST);
loForm.setCanSubmit(true);
final TextAreaItem loDataToExport = new TextAreaItem("psExcelData");
final Window loExcelWindow = new Window();
loExcelWindow.setWidth(5);
loExcelWindow.setHeight(5);
loExcelWindow.addItem(loForm);
addChild(loExcelWindow);
new Timer() {
public void run() {
cancel();
loDataToExport.setValue(moHeader.getHeaderAsExcel() + "<br><br>" + moReportGrid.getDataAsHTML());
loForm.setFields(loDataToExport);
new Timer() {
public void run() {
cancel();
manageEndOfCall();
loForm.submit();
loExcelWindow.destroy();
}
}.schedule(200);
}
}.schedule(200);
}
I've already debugged the getDataAsHTML method and the string that it returns is fine, it contains the correct HTML, however when I call the method getParameter in the JSP y returns a null value. Here the code of the JSP:
<%
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=eYumReport.xls");
String msDataToExcel = request.getParameter("psExcelData");
%>
<html>
<head>
<title>Data to excel</title>
</head>
<body>
<%=msDataToExcel %>
</body>
</html>
I may have to mention I am using this on Firefox 26, GWT 2.1, smartGWT 2.4, Windows 7 Professional and the Web application is on Windows Server 2008, mounted on Apache 6.
Any ideas why this is happening??

Jquery progress bar implementation for JSP/Liferay

I'm quite new to JSP/Liferay portlet development and I'm trying to add a progress bar using jQuery, I found this question but wasn't very specific to how it will be done using AJAX.
I was wondering if anyone can point me in the right direction to help me get started.
thanks.
EDIT:
I used JSON simple, and manage to make some changes but I am getting a bad request(error code 400 when using fire bug) and a 404 not found on my JS
below is my code:
public void processAction(
ActionRequest actionRequest, ActionResponse actionResponse)
throws IOException, PortletException {
//some code here
this.generateJSON(actionRequest, actionResponse);//manual call the method?
public void generateJSON(ActionRequest actionRequest, ActionResponse actionResponse)
throws IOException, PortletException {
try{
//just want to see a progress bar so do static for now...
JSONObject obj=new JSONObject();
obj.put("percent",new Integer(30));
StringWriter out = new StringWriter();
obj.writeJSONString(out);
String jsonText = out.toString();
}catch(Exception ex){
System.out.print(ex);
}
}
}//end of class
JS here
function checkStatus(){
$.ajax({
type: 'POST',
//url: '<%=request.getContextPath()%>/checkStatusServlet',
url: '<%=request.getContextPath()%>/generateJSON',
dataType: 'json',
success: function( data )
{
alert(data.statusPercent);
var statusPercent = data.percent;
//Update your jQuery progress bar
$( "#progressbar" ).progressbar({value: statusPercent});
}
});
//below works and alert is being called...
/*for (i=0;i<=5;i++)
{
$( "#progressbar" ).progressbar({value: i+10});
}
alert('got here');
*/
}
HTML/JSP
<%# page import="javax.portlet.PortletPreferences" %>
<portlet:defineObjects/>
<portlet:renderURL var="resourceUrl"></portlet:renderURL>
<!-- Javascript files -->
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.js"></script>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="js/main.js"></script>
<!-- end of Java script files -->
<script type="text/javascript">
setTimeout('checkStatus()',1000);
</script>
<div id="progressbar"></div>

You can't generate JSON in processAction. This method is meant to change the portlet state, but not generate output. The portal-way to accomplish what you need it to use the serveResource method/lifecycle-phase: you get the URL for this from the portal ( < portlet:resourceURL / >). Specifically you shouldn't create them yourself.
An alternative (but not the portal way) is to use a servlet - but in this you don't have the portlet state that you might need.
And you might want to use < portlet:namespace / > to disambiguate your global names - or use proper namespacing - because you can never say how many times your portlet will be placed on a page.
(added spaces to jsp-tags so that they don't get eaten by markup)
Short: Read about resource-serving for portlets, this will most likely solve your underlying problem: With the code you give above you won't be able to access your JSON at all - no matter what you do on the JS side.

The answer really depends on your specific needs. Are you trying to display how much time is actually left for some task, or how much time till a page loads or what?
You could poll from the client and update the progress bar in the browser depending on how much is left to process. A simple jQuery ajax example:
function checkStatus
{
$.ajax({
type: 'POST',
url: '<%=request.getContextPath()%>/checkStatusServlet',
dataType: 'json',
success: function( data )
{
var statusPercent = data.statusPercent;
//Update your jQuery progress bar
$( "#progressbar" ).progressbar({value: statusPercent });
}
});
}
Then you can simply poll this function till its done
setTimeout('checkStatus()' 1000);
Of course you will also need to construct a servlet or struts action or portlet to handle the processing on the server, and return the appropriate status for the task.
EDIT:
Use the JSON library
From your servlet or action. (code below is from struts2 action)
public String checkStatus()
{
try
{
Integer percentDone = 50; //Calculate how much time is left
JSONObject statusResult = new JSONObject();
statusResult.put("statusPercent", percentDone);
//Obtain HttpServletResponse..
//implementation depends on your framework.
//PortletResponse should work too.
PrintWriter out = this.response.getWriter();
out.write( statusResult.toString(4) );
out.flush();
out.close();
}
catch (IOException e) {}
catch (JSONException e) {}
return null;
}