JSP, APPLET and JNLP

OK, here is my question, we have a simple (sic) application, which consists of jsps, applets ( Runtime.exec ), I have been suggested to use jnlp and jws, A typical JSP page looks like this.
<% %>
:Bunch of JSP /HTML stuff
<APPLET>
</APPLET>
Bunch of jsp/HTML/javascript stuff
How should i go about changing it to jsp + jnlp, Any insight is helpful.
Thanks.

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Can anybody help me. I want to call a JSP page from within a applet and to this JSP page i want to pass the query which the applet has created in POST method.
I want to refresh the applet page with the new JSP page by passing the query object so the jsp page with take this query, and display the resultset
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Applet loads in one jsp page and doesn't in the other

Hi,
I've got a strange problem. I've written an applet which I want to embed in a jsp page in a web application. I've created a very small web application to simplify testing the applet, and all works well in it. But when I try to embed the applet in my real web application (exactly the same way) it fails to init, firefox hangs, and in java console I get;
java.lang.ClassFormatError: Incompatible magic value 168430090 in class file pl/cardq/applet/GameApplet1
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:178)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:127)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:618)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:778)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2045)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:707)
at sun.applet.AppletPanel.run(AppletPanel.java:361)
at java.lang.Thread.run(Thread.java:619)
Any idea what that means?
Thanks in advance

Once the print window is open, click on "PDF", in the list of options you will find "open PDF in Preview".
(I hope my translation is good because I am using French...)

Can objects be passed between Applets and JSP?

Can objects be passed between Applets and JSP? If so how? Thanks in advance.
Scott

see if this helps,
http://forum.java.sun.com/thread.jsp?forum=54&thread=136847

I'm crazy!Applet and JNA Error:Library 'jnidispatch' was not found!

Hi all,
sorry to bother you, I really have no idea how to do JNA and Applet. I'm hardly mazy, man.
Every time it will throw an error to me :
Exception in thread "thread applet-JNAApplet-1" java.lang.UnsatisfiedLinkError: Library 'jnidispatch' was not found by class loader sun.plugin2.applet.JNLP2ClassLoader@291aff
     at com.sun.jna.Native.getWebStartLibraryPath(Native.java:858)
     at com.sun.jna.NativeLibrary.<clinit>(NativeLibrary.java:576)
     at com.sun.jna.Library$Handler.<init>(Library.java:140)
     at com.sun.jna.Native.loadLibrary(Native.java:372)
     at com.sun.jna.Native.loadLibrary(Native.java:357)
     at JNAApplet.init(JNAApplet.java:15)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)My program is so easy, I just want use Applet to revoke JNA and use the JNA to load a native lib.
here is the structure of my program:
Applet code :
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
import com.sun.jna.Native;
public class JNAApplet extends JApplet {
     public static Kernel32 kernel32 = null;
     @Override
     public void init() {
          createGUI();
          kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
          if (kernel32 == null) {
               System.out.println("load kernel32 fail!");
          } else {
               System.out.println("load kernel32 success!");
     private void createGUI() {
          JPanel panelCenter = new JPanel();
          JButton butTest = new JButton("Test");
          panelCenter.add(butTest);
          setContentPane(panelCenter);
}When I run it on debug mode, it is ok! but when I deploy it , it will throw above error message to me.
My Applet html:
<html>
     <head>
          <title>JNA Applet</title>
     </head>
     <body>
     <script src="deployJava.js"></script>
    <script>
        var attributes = { code:'JNAApplet', width:300, height:300} ;
        var parameters = {jnlp_href: 'JNAApplet.jnlp'} ;
        deployJava.runApplet(attributes, parameters, '1.5');
    </script>
     </body>
</html>File 'JNAApplet.jnlp':
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">
    <information>
        <title>JNA Applet</title>
        <vendor>Steven</vendor>
    </information>
    <resources>
        <j2se version="1.5+"
              href="http://java.sun.com/products/autodl/j2se" />
        <jar href="JNAApplet.jar" main="true" />
    </resources>
    <applet-desc
         name="JNA Applet"
         main-class="JNAApplet"
         width="300"
         height="300">
     </applet-desc>
     <update check="background"/>
</jnlp>     I really have no idea. and I can't search any usefull infomation from Google and officer site.
Can any one help me? Thank you very much!!!!

Hi AndrewThompson64:
Did you mean the JNA project? Or are you refering to JNI, or ..something else?Yes, I mean is that I wanna jna.jar to replace JNI to code with Applet. I want Applet can run native library(.dll files).
That reads like so much nonsense to me.Sorry fo that.
Was there any 'caused by' part that you trimmed? I expected to see something to do with 'Security' or 'AccessControl'.Sorry, I can't saw any 'cause by' subsentence there. This message is just gain from Applet Console.(Is there any method to gain more message?)
About 'Security' and 'AccessControl' I just modify my java.policy file to allpermission. Subsequently, I signed all jar files.
For now I have 3 jar files(all have been signed ):
--example.jar : for this little program.(code include applet and application entry)
--jna.jar
--win32-x86.jar : include kernel32.dll and jnidispatch.dll for win32 and x86.
and 2 JNLP files:
--JNAApplet.jnlp the entry is JNAApplet.class (this jnlp does not work)
--JNAApp.jnlp     the entry is JNAApp.class (this jnlp works)
And for now new error message show like this:
Exception in thread "thread applet-JNAApplet-1" java.lang.UnsatisfiedLinkError: Library 'Kernel32' was not found by class loader sun.plugin2.applet.JNLP2ClassLoader@4aeb52
     at com.sun.jna.Native.getWebStartLibraryPath(Native.java:858)
     at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:97)
     at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:228)
     at com.sun.jna.Library$Handler.<init>(Library.java:140)
     at com.sun.jna.Native.loadLibrary(Native.java:372)
     at com.sun.jna.Native.loadLibrary(Native.java:357)
     at JNAApplet.init(JNAApplet.java:12)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Did you mean invoke?
Revoke: To annul by withdrawing.
Invoke: To call on.Yes, you got it. Thank you.
The JNLP file is invalid. ..I was about to put my 'standard' text here, but I'm sick of saying it. Search the forum for my posts - 50% of them, at least, mention validation and how to go about it.
Also, the applet-desc requires a documentbase.Thank you, I really think I have some invalid section. But I can't find it, and you said 'Search the forum for my posts - 50% of them...' , I can read the JNLP structure on site of sun and I can to read you post too(I'm doing like this).*I only want to know about how to load "native lib like *.dll" properly*.
What 'officer site'?I mean jna project site. Sorry for ambiguity.
Please fix that sticky '!' key. One '!' indicates astonishment, while two or more typically indicates a bozo. Thanks for your advice. Because I tried to find solution do my best lasting two days. I got nothing. I'm sadness.
here post my new files:
import javax.swing.JFrame;
import com.sun.jna.Native;
public class JNAApp {
     public static Kernel32 kernel32 = null;
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
          JFrame frame = new JFrame();
          frame.setSize(500, 500);
          frame.setVisible(true);
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
import com.sun.jna.Native;
public class JNAApplet extends JApplet {
     public static Kernel32 kernel32 = null;
     public void init() {
          createGUI();
               kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
     private void createGUI() {
          JPanel panelCenter = new JPanel();
          JButton butTest = new JButton("Test");
          panelCenter.add(butTest);
          setContentPane(panelCenter);
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">
    <information>
        <title>JNA Applet</title>
        <vendor>Steven</vendor>
    </information>
    <resources>
        <j2se version="1.5+"
              href="http://java.sun.com/products/autodl/j2se" />
         <jar href="JNAApplet.jar" main="true"/>
         <jar href="jna.jar"/>
    </resources>
       <resources os="Windows" arch="x86">
         <nativelib href="win32-x86.jar"/>
         <nativelib href="kernel32.jar"/>
       </resources>
    <applet-desc
         documentBase=""
            name = "success"
         main-class="JNAApplet" width = "200" height = "200">
     </applet-desc>
     <update check="background"/>
       <security>
         <all-permissions/>
       </security>
</jnlp>
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">
    <information>
        <title>JNA Applet</title>
        <vendor>Steven</vendor>
    </information>
    <resources>
        <j2se version="1.5+"
              href="http://java.sun.com/products/autodl/j2se" />
         <jar href="JNAApplet.jar" main="true"/>
         <jar href="jna.jar"/>
    </resources>
       <resources os="Windows" arch="x86">
         <nativelib href="win32-x86.jar"/>
         <nativelib href="kernel32.jar"/>
       </resources>
    <application-desc
         main-class="JNAApp">
     </application-desc>
     <update check="background"/>
       <security>
         <all-permissions/>
       </security>
</jnlp>     Thanks & Best Regards,
Su Heng

Java applet and Linux RedHat7.1 kernel 2.4.2-2

Hello.
I have really interesting problem...
I am trying to run java applet in different env.:
#1. windows2000, sun java1.3.1, webstart 1.0.1;
#2. linux RedHat 7.1 kernel 2.4.2-2, sun java1.3.1, webstart 1.0.1;
#3. linux RedHat 7.0, kernel 2.2.16-22, sun java1.3.0-01, webstart 1.0.1;
#4.SunOs5.8, sun java1.3.0, webstart 1.0.1.
I found that webstart can't launch applet into a full size under #2.
Applet runnable, no error msg in java console, but the applet frame
size is decrease into min. At the same time this application perfectly
runnable without any changes under the other env.(#1, #3, #4).
JNLP file:
<?xml version="1.0" encoding="utf-8"?>

<jnlp
spec="1.0+"
codebase="http://www.mycodebase"
href="FpEdit.jnlp">
<information>
<title>Ufp Editor Application</title>
<vendor>ME</vendor>
<homepage href="http://www.myhomepage"/>
<description>Ufp Editor Application</description>
<description kind="short">
Swing Graphical User Interface.
</description>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.3+" initial-heap-size="30m" max-heap-size="50m"/>
<jar href="http://www.myhref/SFpEdit.jar"/>
</resources>
<applet-desc
documentBase="http://www.mydocumentbase"
name="FpEdit"
main-class="FpEdit"
width="950"
height="590">
</applet-desc>
</jnlp>
May be somebody can explain me what is the problem???
Thank's.

Sorry about replay, but may be somebody can help me...
For me ==> this is a problem between new
linux kernel 2.4.. and java...

JSP & APPLET

Hi guys,
I am studying about Java Server Pages, I lear that the jsp:plugin tag of JSP techcnology have support for this. Then I create a simple swing applet and a JSP page like fellow:
<jsp:plugin type="applet" code="package.MyApplet" width="450" height="350">
    <jsp:params>
        <jsp:param name="param1" value="value1"/>
    </jsp:params>
</jsp:plugin>But when I try to load the jsp page the browser (Netscape run on linux) show the download plugin dialog!!! What I can do to the browser get the applet?!?! I install de j2sdk and I have the Java Plug in (do I need to create a environment variable for it, or configure in netscape?!?!)
Another question, I am using the Tomcat, Do I need to "describe" the applet in the web.xml descriptor file?!! If yes How I can do this!?!?
Thanks everyone.
Giscard

This question have been asked and answer before. Use the search button to locate issues.
What OS
In Windows, go to control panel by typing control in command line console, locate your java plugin and enable netscape and iexplorer. Does older browser do not support java plugin so you need the later version of browser. Mozilla is a good choice.
You cannot configure XML descriptor file to use plugin.

Java Web Start and JNLP Problem

Hi !
I�m a student and i need your help for a work that i have to do.
I have an aplication that parse an XML file.
The XML file is in ther server, and when i run the aplication with Java Web
Start and jnlp file i want that the application parse a XML file.
is this possible??? how can i do ???
if you dont understand please warn me, that i try to explain better..
thanks, in advance.
Rui Silva , Portugal

I'm not sure that you need webstart.
Just an applet will allow you to read a file from the server:
Just open a URL pointing to the .xml file.
Read the file into a buffer and then parse it.
Now actually getting the applet to do something with the contents of the .xml file
is more complicated. Presumably you need to write something which understands the
contents of the .xml and does something in response to the contents.
A signed java program can be run from with in webstart which can spawn processes on
the local machine. os.systemExec("command a b c"); But of course that has cross platform
problems.
Good luck

About applets and secure connection

Hello. I've read some threads but I can't understand a thing about applets and SSL.
I've a signed applet. This applets is embedded with applet tag in a jsp page.
The applet works as a file uploader.
With signing, the applet can access to the user file system without problem, open a connection with the server and upload files.
Now, If I want to use HttpsUrlConnection instead of the standard http connection, what certificate does the applet use for handshake? Does the applet automatically use the same certificate used for signing?
Thank you

Hello. I've read some threads but I can't understand a thing about applets and SSL.
I've a signed applet. This applets is embedded with applet tag in a jsp page.
The applet works as a file uploader.
With signing, the applet can access to the user file system without problem, open a connection with the server and upload files.
Now, If I want to use HttpsUrlConnection instead of the standard http connection, what certificate does the applet use for handshake? Does the applet automatically use the same certificate used for signing?
Thank you

JSP applet tag X Html applet tag (what is the difference?)

what is the advantage in using the JSP applet tag instead of a simple Html applet tag ?
second question:
I have an applet in a Html frame, and a menu on the left side.... When the user select the applet option at first time, everything runs ok.. after the user select another option and then select the applet again, it fails in some features .. Why ?

well, if by "the JSP applet tag", you mean the jsp:plugin tag.. that will just generate the same HTML tag you would write. The only advantage would be it should be less typing to use the taglib.
second answer:
without seeing any code, it'd be hard to figure out the problem. The obvious thing is you are setting some state of something that is preventing further action.

JSP Applet communication

Hi all ,
I know this question has been asked so many times and I have read all the posts but still i was unsuccessful.
I am trying to send a string from a jsp to another jsp which is loading the applet to display that string.
In my first jsp:
<form method=post action="hello.jsp">
<input type="text" name="formDesc" value="IBMTR/ABMTR Form" size="20" maxlength="20">
<input type=submit name="Go" class="submituttontext" value="Go">
</form>
in my seccond jsp:
<APPLET CODE="ParamTest.class" WIDTH="400" HEIGHT="50">
<PARAM NAME="font" VALUE="Dialog">
<PARAM NAME="size" VALUE="24">
<PARAM NAME="string" VALUE="Hello, world ... it's me. :)">
<PARAM NAME="formDesc" VALUE="<%=request.getParameter("formDesc");%>">
</APPLET>
in my applet:
String myFont = getParameter("font");
String myString = getParameter("string");
int mySize = Integer.parseInt(getParameter("size"));
String desc =getParameter("formDesc");
Font f = new Font(myFont, Font.BOLD, mySize);
g.setFont(f);
g.setColor(Color.red);
g.drawString(myString, 20, 20);
g.drawString(desc, 40, 40);
but nope i cannot see...formDesc ..I jus see the <%=getParameter%>
Thanx

At first glance the only error I see is:
<PARAM NAME="formDesc" VALUE="<%=request.getParameter("formDesc");%>">
should be changed to:
<PARAM NAME="formDesc" VALUE="<%=request.getParameter("formDesc") %>">
No semicolon in expressions. This should give you JSP compile error, so maybe that was just a typo in your post and not the real problem.
Let me know.

Why jws doesn't start when i use jsp as dynamic jnlp?

hello everyone,
i use a jsp as dynamic jnlp to resolve the relative codebase problem,but jws can not start. while i use jnlp, there is no problem.i check the http head the jsp reterned,it seems no problem (it returns "application/x-java-jnlp-file" content type), but jws does not start and the browser opens it as a plan text. below is the http head the jsp and jnlp returned, i can not see any obvious difference that prevent jws start. hope somobody can help me, thanks.
the jsp http head:
HTTP/1.1 200 OK
Content-Type: application/x-java-jnlp-file
Date: Wed, 07 Aug 2002 02:52:31 GMT
Server: Apache Tomcat/4.0.2 (HTTP/1.1 Connector)
Connection: close
Set-Cookie: JSESSIONID=EDAB1A3175B3D319BA33AE090EB973BF;Path=/webims
the jnlp http head:
HTTP/1.1 200 OK
Content-Type: application/x-java-jnlp-file
Content-Length: 372
Date: Wed, 07 Aug 2002 02:49:58 GMT
Server: Apache Tomcat/4.0.2 (HTTP/1.1 Connector)
Connection: close
Last-Modified: Wed, 07 Aug 2002 02:35:19 GMT
ETag: "372-1028687719000"
the response body is same. here is part of the jsp file:
<%@ page contentType="application/x-java-jnlp-file"%>
<%
StringBuffer codebaseBuffer = new StringBuffer();
codebaseBuffer.append(!request.isSecure() ? "http://" : "https://");
codebaseBuffer.append(request.getServerName());
if (request.getServerPort() != (!request.isSecure() ? 80 : 443))
codebaseBuffer.append(':');
codebaseBuffer.append(request.getServerPort());
codebaseBuffer.append(request.getContextPath());
%>
<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase="<%=codebaseBuffer.toString()%>" href="<%=request.getRequestURI()%>">

I get the same problem since I moved to Tomcat 4.1.18.
The difference is that when I look at a jnlp, I get
Date: Tue, 18 Mar 2003 10:58:25 GMT
Server: Apache/1.3.26 (Unix) mod_jk/1.2.0 mod_ssl/2.8.10 OpenSSL/0.9.6b PHP/4.2.3 FrontPage/5.0.2.2510
Content-Length: 1355
Content-Type: application/x-java-jnlp-file
Last-Modified: Mon, 17 Mar 2003 15:58:46 GMT
Client-Date: Tue, 18 Mar 2003 10:58:25 GMT
Client-Peer: 192.197.110.222:80
and at a jsp:
Date: Tue, 18 Mar 2003 11:06:10 GMT
Server: Apache/1.3.26 (Unix) mod_jk/1.2.0 mod_ssl/2.8.10 OpenSSL/0.9.6b PHP/4.2.3 FrontPage/5.0.2.2510
Content-Type: application/x-java-jnlp-file;charset=ISO-8859-1
Client-Date: Tue, 18 Mar 2003 11:06:10 GMT
Client-Peer: 192.197.110.222:80
Set-Cookie: JSESSIONID=026BF3209EC094A4045F1D37C2A0E98B;Path=/
Could the difference be ;charset=ISO-8859-1
How to remove that, in my jsp I just have :
<% response.setContentType("application/x-java-jnlp-file"); %>
Help
Benoit

JSP - Applet problem

Hi
How do I call an Applet from JSP?
I have a applet that talks with jsp which talks to a bean, the connection between jsp and the bean is okay but between jsp and the applet im not sure how to do. Any suggestions?
Jonas

Yes JSP is an extension of Servlets, bu you have to understand the difference and the need why JSP's are created and where it fits the best. For you situation I assuming you want to access a JSP page which has an applet in a browser, then to interact the applet which needs to communicate the server it came from(not necessarily that particular JSP). If that is the case you need and a Servlet for the rest of the communication(Servlets are better choice whent there is no presentation going back to the client) which is just exchange of data between the servlet and the Applet.
The Applet and the servlet could communicate through sockets or URLConnection or even RMI which ever you feel more convertible(RMI if you are passing objects).

JSP & APPlet - HTML

Hi All,
I am new to web development platform. I know core java, now as I need to proceed to web development I would like to know certain concepts / languages used.
Jsp - Jsp is used to develop webpages, how does it differ from html.
Applets - We can develop web pages using applets. Then what are the circumstance we use applets, jsp.
JSP & Applets - Can JSP and Applet both used to create a webpage? If yes how?
Kindly answer my question. Thank you.
Regards,
lg

Go look up a basic tutorial dude.
Basically JSP lets you create an HTML page on the fly. Rather than just serving up a static page, you customise it for each request.
This gives a pretty good example of how JSP fits into things
http://www.javaranch.com/journal/200510/Journal200510.jsp#a1
Applets - Its a program running on a web page. I kinda lump them into the same box as "flash" and "activex". They let you step outside the bounds of html which a webpage is tied to. That has both advantages and disadvantages. Most web applications don't use applets.

Jsp:plugin and codebase

I have a JSP with the following jsp:plugin code:
<jsp:plugin type="applet"
code="com.package.Applet.class"
codebase="/application1/applets/" width="50"
height="50">
</jsp:plugin>
Web applications, which run this applet, specify different codebase, such as /application2/applets/,
/application3/applets/ and so on.
Unfortunatelly JSP specification doesn't allow dynamic codebase in jsp:plugin and we create a new JSP for
each new web domain to specify another hardcoded codebase attribute.
Could you please advice a trick to generate codebase attribute at run-time, to deploy the same JSP in all
applications.
Evgeny Gesin
Javadesk

Well, then I would just put in the object/embed tags yourself. You can get whatever the plugin tag writes by just using the tag once with static values and view the source in the browser and copy it out, then replace whatever values with scriptlets (or other taglib tags) to fill in the correct values.

JSP, APPLET and JNLP

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