APPLET CODE="test.jar"..

Hi.
Is there a way to have a .jar loaded in HTML??
In the .jar I have a JApplet and some images...
The problem is to sign a .jar file... If I have to put a .class on the code PARAMETER the security problems will persist... Right??
Tanks

Reformulating the questions...
I have a Applet that need to be signed to have I/O...
How can I sign a .class file? The only way is to sign a .jar, rigth?
So how can I load a applet on a .jar file?
Thanks

Similar Messages

In 7u51, will all jars referenced by the applet need to be updated to include the Permissions Manifest attribute ? Or, will it be limited to the jar that contains the applet code ?

To whom it may concern,
According to Java RIA checklist(http://www.oracle.com/technetwork/java/javase/overview/ria-checklist-2055184.html),
as of 7u51(January 2014), Permissions Manifest attribute in main JAR file will be required.
But, at least, as of 7u45, when the Security Level slider is set to Very High,
a jar without Permissions Manifest attribute, which doesn't contain the applet code but is just referenced by the applet,
prevent the applet from running.
So, the question is:
In 7u51, does it mean that all jars referenced by the applet need to be updated to include the Permissions Manifest attribute ?
Or will it be limited to the jar that contains the applet code?
There is a concern that we will have to modify library jars that we do not control.
Sincerely,
Toshio Shiko

Thank you for your quick response and your investigation!
It do help us very much.
But, unfortunately, for the moment, I'm not allowed to test the early access version.
As soon as circumstances are changed, I' d like to test it.
Again, thank you for your providing of the useful information.

How do I update a file in an Applet's JAR file from the Applet code

Here's my problem.
My applet is using a serializable history data in which I am storing in the applet's JAR file. When I run the applet, I read the file with "getResourceAsStream()" and run my program with that hist data. When my applet is closed, I need to update this file from my Applet's code and I dumfounded about how to do that.
Is there any way to update a file in the Applet's JAR file through the Java Applet code? (i.e. OutputStream?).
Would appreciate any advice people have.

Just place a copy of the file on the local hard disk and update that. When you start the Applet you try to read from the hard disk. If the file exists then no problem otherwise copy it from the jar to the hard disk.

Class not found in applet using 2 jar files

I have an applet which has been working for years as a stand alone or connecting directly to a derby database on my home server. I have just changed it to connect to MySQL on my ISP server via AJAX and PHP.
I am now getting a class not found error in my browser, probably because I'm stuffing up the class path.
The HTML I am using to call the applet is:
<applet code="AMJApp.class"
codebase="http://www.interactived.com/JMTalpha"
archive="AMJ014.jar,plugin.jar"
width="500"height="500"
MAYSCRIPT style="border-width:0;"
name="jsap" id="jsap"></applet>The AMJ014.jar contains the applet and supporting class files.
The error message is strange to me because it refers to a class I noticed on another web page but which has nothing to do with my applet. Anyway, the message in full is:
load: class NervousText.class not found.
java.lang.ClassNotFoundException: NervousText.class
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: NervousText.class
java.lang.UnsupportedClassVersionError: AMJApp : Unsupported major.minor version 51.0
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClassCond(Unknown Source)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.defineClassHelper(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.access$100(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.UnsupportedClassVersionError: AMJApp : Unsupported major.minor version 51.0

Thanks again.
The page code is:
<html>
<head>
<title>Applet to JavaScript to PHP</title>
</head>
<body>
<script type="text/javascript">
function updateWebPage(myArg)
document.getElementById("txt1").innerHTML=myArg;
if (myArg=="")
document.getElementById("cbxItem").innerHTML="";
return;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.onreadystatechange=function()
if (xmlhttp.readyState==4 && xmlhttp.status==200)
    document.getElementById("cbxItem").innerHTML=xmlhttp.responseText;
xmlhttp.open("GET","putitem.php?id="+myArg,true);
xmlhttp.send();
</script>
<form>
<table border=1 align='center' cellpadding=0 cellspacing=0 >
<tr><td style='text-align:center; background-color:#C0C0C0'>Compiled Java Applet</td></tr>
<tr><td><applet code="AMJApp.class" codebase="http://www.interactived.com/JMTalpha" archive="AMJ014.jar" width="500"height="500" MAYSCRIPT style="border-width:0;" name="jsap" id="jsap"></applet> </td></tr>
<tr><td style='text-align:center; background-color:#C0C0C0'>HTML Textbox filled by JavaScript</td></tr>
<tr><td><textarea style='width:500px; height:50px' name='txt1' id='txt1'>Query goes here</textarea></td></tr>
<tr><td style='text-align:center; background-color:#C0C0C0'>HTML diagnostic messages rendered by PHP script</td></tr>
<tr><td><div id="cbxItem">PHP info will populate this space</div></td></tr>
</table>
</form>
</body>
</html>The URL of the problem page is:
http://www.interactived.com/JMTalpha/AMJTest.htm
The code in the page is based on the following test page, which works:
http://www.interactived.com/test5Applet.htm
And the Applet, before I made any changes can be seen at this address:
http://www.interactived.com/jartest0906.htm
Thanks again for you interest.
Edited by: 886473 on 21-Sep-2011 00:47

Error running applet within a jar

I compile the jar files together with the smack.jar and smackx.jar and then signed the applet
try to run with this code for my HTML file
<html>
<head>
<meta HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<meta HTTP-EQUIV="Expires" CONTENT="-1">
<title> Applet Test</title>
</head>
<applet code="chat\chat\ChatApplet" archive="chat.jar" width=600 height=400>
</applet>
</html>it prompts me to run the application, I select 'Yes' and it give me this load of error
Java Plug-in 1.6.0_06
Using JRE version 1.6.0_06 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\blah
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
p:   reload proxy configuration
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
java.lang.NoClassDefFoundError: chat/chat/ChatApplet (wrong name: chat/ChatApplet)
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$000(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

java.lang.NoClassDefFoundError: chat/chat/ChatApplet (wrong name: chat/ChatApplet)The above says you use chat/chat/ChatApplet but it should be chat/ChatApplet.

How to use an Applet with multiple-jars

Hi everybody,
I would like to use an applet with multiple-jars.
ex:
<applet codebase="." archive="main.jar,Addon1.jar,Addon2.jar" code="Appl.class" id="MyTest" width="600" height="30">
     <param name = "MyParam" value = "1;2">
</applet>
An applet with :
-> 1 Main JAR
-> X Addon JARs (X : a parameter "PRM")
My main part knows the parameter "PRM" -> knows which addon to use
My question is, how do I use classes from addons, inside the main part (and vise-versa if possible) ?
Thanks in advance
Best regards

I try what you say :
=== HTML ===
<applet codebase="." archive="Main.jar,Addon1.jar" code="Test.Appli.class" id="MyTest" width="600" height="30">
     <param name = "myPrm1" value = "1;2">
</applet>=== MAIN JAR ===
package retest;
interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
public class Ctest {
    public Ctest() {}
    public void unTest(String sClassNameR) {
      String sClassName = "PackTestAddon.TestClass1";
      try {
          Object oObj = Class.forName(sClassName).newInstance();
          ((InterfAddOn1) oObj).AfficheTest1(" Hello World ");
      } catch (ClassNotFoundException ex1) {
          System.out.println("ERR Class not found");
      } catch (IllegalAccessException ex1) {
          System.out.println("ERR Illegal Access");
      } catch (InstantiationException ex1) {
          System.out.println("ERR Instantiation Exception");
}=== ADDON JAR ===
package PackTestAddon;
public interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
package PackTestAddon;
public class TestClass1 implements InterfAddOn1 {
    public TestClass1() {}
    public void AfficheTest1(String sStrTest) {
      System.out.println("Test :"+sStrTest);
}I have this error :
Exception in thread "AWT-EventQueue-2" java.lang.ClassCastException: PackTestAddon.TestClass1
     at retest.Ctest.unTest(Ctest.java:58)
     at retest.Appli.actionPerformed(Appli.java:442)
     at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
     at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at javax.swing.JComponent.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
I don't really know why ... =;o(
Helppppp ... Thanks in advance.

Changing applet code - refresh browser

I've put my java applet into web page and run browser. After that, I've changed the applet's code and refreshed browser, but I haven't seen any changes. What I should do to see changes? I tried this in Firefox and IE.
greetings :)

Try the "cache-version" param tag. Each time you change it, the jar should be updated.
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" NAME="test" WIDTH=1 HEIGHT=1>
      <PARAM NAME="CODE"                  VALUE="com.something.test.class">
      <PARAM NAME="CODEBASE"              VALUE="alg/applets">
      <PARAM NAME="ARCHIVE"               VALUE="test.jar">
      <PARAM NAME="cache_archive"         VALUE="test.jar">
      <PARAM NAME="cache_version"         VALUE="2.1.2.3">
      <PARAM NAME="type"                  VALUE="application/x-java-applet;version=1.2">
      <PARAM NAME="scriptable"            VALUE="true">
      <PARAM NAME="MAYSCRIPT"             VALUE="true">
<OBJECTAlso check the control panel of your java runtime. See "cache" tab. disable caching there.
Good luck!

Loading applet for a jar within an ear

Hi,
Apologies if my question sounds ignorant, this is the first time i'm playing with applets.
I'm trying to load an applet from a JAR (applet.jar) which contains all the files specific to the applet. The applet.jar resides within an ear (application.ear) which is deployed on JBoss.
The applet related stuff is in the package com.dms.applet (which makes up the applet.jar)
My index.html resides in a war file (webapp.war), which essentially contains a bunch of servlets. Index.html is a two frame page, which tries to load the applet in one frame and a servlet in another (servlets work fine).
My <APPLET> tag for the frame in which the applet is displayed (is another html file - applet.html) looks something like this:
<html><body>
<APPLET
     code="com.dms.applet.NavigationApplet.class"
     codebase=./"
     archive="applet.jar, application.ear"
     width=200
     height=500
>
</APPLET></body></html>
however, the applet always fails to load, i get the following exception when i open the java console:
java.lang.ClassNotFoundException:
com.dms.applet.NavigationApplet.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
load: class com.dms.applet.NavigationApplet.class not found.
java.lang.ClassNotFoundException:
com.dms.applet.NavigationApplet.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
It seems evident that the applet class loader can't find my applet.class and hence can't load it. I guess that its something wrong with my <APPLET> tag, but can't quite seem to get my finger on it. Do i need to explicitly tell the class loader to look for it in the applet.jar which is in the applicatin.ear?
Any help would be very much appreciated.
Thanks in advance
EnterpriseJavaBones

Hi,
I managed to fix this problem. For those who mite come across the same issue in the future, this is how i did it.
I put the applets code in the war file under an applet dir. That the the index.html is in the root (of the war dir) and the applets code is in a /applet dir.
Hence the codebase simply reads, codebase="applet/"
Cheers
EnterpriseJavaBones

Urgent help needed in two clarifictions of applet code

Hi,
I have an applet code where I have two buttons. Now, if button A is clicked it should pass a particular query string while if button B is clicked it should pass another particular query string.
I would like to confirm
1) Whether the query string passed is a valid statement(/approach) and
2) Why there is an error in assigning qryString to qryString1.
Thanks for any help/advise in advance.
THE CODE:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class ReinApplet1 extends Applet implements ActionListener
TextField text;
Button button1;
Button button2;
TextArea taResults;
public void init()
button1 = new Button("A");
button1.addActionListener(this);
add(button1);
button2 = new Button("B");
button2.addActionListener(this);
add(button2);
taResults = new TextArea(2,30);
add(taResults);
// text = new TextField(20);
// add(text);
public void actionPerformed(ActionEvent e)
Object obj = e.getSource();
if(obj == button1)
String qryString = "select name from test where letter = A";
executeQuery();
if(obj == button2)
String qryString = "select name from test where letter = B";
executeQuery();
public void executeQuery()
String qryString1 =qryString;
try
URL url=new URL("http://localhost:8080/examples/servlet/ReinServlet1");
String qry=URLEncoder.encode("qry") + "=" +
URLEncoder.encode(qryString1);
URLConnection uc=url.openConnection();
uc.setDoOutput(true);
uc.setDoInput(true);
uc.setUseCaches(false);
uc.setRequestProperty("Content-type",
"application/x-www-form-urlencoded");
DataOutputStream dos=new DataOutputStream(uc.getOutputStream());
dos.writeBytes(qry);
dos.flush();
dos.close();
InputStreamReader in=new InputStreamReader(uc.getInputStream());
int chr=in.read();
while(chr != -1)
taResults.append(String.valueOf((char) chr));
chr = in.read();
in.close();
// br.close();
catch(MalformedURLException e)
taResults.setText(e.toString());
catch(IOException e)
taResults.setText(e.toString());

String qryString = "select name from test where letter = A";
...this is a local variable ...local to your actionperformed method. The reason the assignment String qryString1 =qryString; doesn't work is because you have no scope to your actionperformed local variables from your executeQuery method. Either make qryString a class variable bty defining it outside any method ...ot, alternatively, pass the string into the executeQuery method.
if(obj == button1)
String qryString = "select name from test where letter = A";
executeQuery(qryString);
public void executeQuery(String query)
String qryString1 = query;
...As for the sql statement, if you are going to refine the query through the letter column, you will need to pull it into the query when you select...
...such as: select name,letter from test where letter = B

applet tag regarding JAR file

Is there something wrong with the following applet declaration?
<applet code = "Sheep2.class" archive="Sheep2.jar" width = 500 height = 300
ALT="If you could run this applet, you'd see a sky, a field, and a moon.">
Your browser is completely ignoring the <APPLET> tag!
</applet>
Works fine (it seems) on my Windows 98 computer with IE 6.0280, but does not work on the same computer when I access the page calling the applet using AOL's v.9 browser.
I used HtmlConverter to convert the above to Extended version (covering all platforms), and still does not work with AOL's browser. HtmlConverter reported no errors, but now IE shows an error icon in its status bar when I access the page even offline.
Other html files I converted using HtmlConverter work fine with AOL's browser. They don't have "archive" attribute.
What could be going wrong? My guess is JAR file reference is causing problems.

I did more Html Conversion today. I ran one file which didn't show any error mark in the status bar of IE through HtmlConverter. I ran the new file generated by HtmlConverter and an error icon appeared in the status bar of IE. My Java Console didn't show any message. So, it must be an error in the applet related info HtmlConverter generated was not 100% html compliant..
BTW, I started speculating the cause of my applets not working on the computer of oen of my friends is simply that her Java Plug-in cannot handle Swing components' J classes.

Applet inside a JAR: Cannot access other classes within the JAR

Hello,
Description
Web app + applet (packaged in a JAR)
I have followed this tutorial
JAR contents
package mypackage
SimpleApplet.class
SimpleObj.class
_"SimpleApplet" uses "SimpleObj"_
package mypackage;
public class SimpleApplet extends JApplet {
    @Override
    public void init() {
        SimpleObj obj = new SimpleObj();
HTML code
<applet archive="SimpleApplet.jar" codebase="." code="mypackage.SimpleApplet.class" width="800" height="600" />
SimpleObj cannot be found (Java Console)
java.lang.NoClassDefFoundError: mypackage/SimpleObj
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: mypackage.SimpleObj
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 8 more
Caused by: java.io.IOException: open HTTP connection failed:*http://localhost:8080/SimpleApp/mypackage/SimpleObj.class*
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 12 more
Exception: java.lang.NoClassDefFoundError: mypackage/SimpleObj
It looks like JRE does not search for the SimpleObj class inside the JAR, but tries to get it from the server...
Any ideas?
Thanks in advance,
Gerard
Edited by: gsoldevila on Dec 10, 2008 2:05 AM

misread, deleted
Edited by: atmguy on Dec 10, 2008 1:12 PM

Applet with adittional jar files / mp3 with Jlayer

In order to support multiple MP3 encodings, I created a class that extends MediaPlayer called [MediaPlayerMP3|http://svn.vacavitoria.com/cabecudinhos_1/mp3AsMediaPlayer/src/mp3asmediaplayer/MediaPlayerMP3.fx] ,
that uses Jlayer to play mp3 files in a separated thread, this works fine inside Netbeans,
but when I try to run in a applet there is no sounds ...
I tried to change the HTML to add the jlayer jar mannualy but didnt work also.
<script>
    javafx(
              archive: "mp3AsMediaPlayer.jar,jl1.0.1.jar",
              draggable: true,
              width: 300,
              height: 200,
              code: "mp3asmediaplayer.Main",
              name: "mp3AsMediaPlayer"
</script>any idea ?
the project is available here
[http://svn.vacavitoria.com/cabecudinhos_1/mp3AsMediaPlayer/]
this is the reference for previous post about the current restricted support of MP3 files
[http://forums.sun.com/thread.jspa?forumID=932&threadID=5368966]
Jlayer mp3 library reference
[http://www.javazoom.net/javalayer/javalayer.html]

First fix your html and regenerate the page using the htmlconverter. Valid html requires quotes around attribute values. The code attribute should point at the class file which you are using. In this case, it appears that your ShopSimulation resides in the shop package, so this should be "shop/ShopSimulation.class". Finally, the archive attribute is a relative URI specifying the location of the archive. The way you have written it, the location should be in the same directory as the html page itself. Also, ensure that your jar contents are proper.
jar tf VirtualShop.jarMETA-INF/
META-INF/MANIFEST.MF
shop/ShopSimulation.class
...Here's the fixed up html.
<head><title>Virtual Shop
</title></head>
<body>
<applet code="shop/ShopSimulation.class"
archive="VirtualShop.jar"
width=200 height=100>
</applet>
</body>

Applet freezes while Jar is loading

Hi everyone,
I have a fundamental question concerning the loading mechanism of an applets resources.
The problem is as follows:
I have two jars, the first containing all *.class files, the second (size: 10MB) containing only graphics and sounds.
I start the applet with this code:
<APPLET ARCHIVE="init.jar,resources.jar" HEIGHT="100" [...]>Of course the point is to have the small init.jar loaded fast an display a loading animation while the big file is beeing loaded in the background. Up to here everything works as expected. When i start the applet, the init.jar is loaded and displays a loading animation as long as i try to get a resource from the resource.jar.
When I do that, my applet freezes while the big resource.jar file is beeing downloaded.
This is how i access the resource in the resource.jar
public void run() {
     while(/*some condition*/) {
          // this is the line which blocks until whole jar is downloaded
          java.io.InputStream input = this.getClass().getClassLoader().getResourceAsStream(/*resource String*/);
          // use input to load resource
}The freeze happens only upon the first time the while-loop runs, after that the resource.jar is chached and access is almost instant.
Now the concrete problem is, that the applet freezed in all its threads while the jar is beeing downloaded. I NEED to display an idle animation while this is done.
Has anyone any suggestion how i can avoid the complete freeze?
I have already concidered to load the resources without specifing the jar in the HTML-ARCHIVE-Tag, this works becouse of the codebase i can load the ressources from, but the problem is, that these resources have a large overhead from the server to the client until i can use them in the program.
Also it is no option to load them all on startup in another backgound thread (which would slove the freeze problem, i tried it), becouse i have to dynamically load and unload these resources to avoid OutOfMemory-Errors. Reloading them brings the overhead-Problem up again.
Only when i specify the 2nd jar in the ARCHIEVE-Tag i have direct access to the browsers chache without wasting memory when holding references to all resources.
After all every loading and stuff works, there are no errors in the programm only this strange behaviour. I Also tried it with different VMs, on different OS, and different Browser, all the same.
I would be glad if someone could give me a hint on this, i've been searching for days now, even tried to analyse the Classoader sources but ended up in sun's native calls...
Thank you in advance
- Loddi

I've been encountering the same problem and I think I've figured out the reason behind it and how to solve it.
It appears that the class loader can only ever load one resource at a time. Once you've forced it to start downloading resources.jar, it can't load any classes until that download has finished, not even classes that are part of the Java API. In your case I believe the solution would be to display one loop of your idle animation before you start loading resources.jar, to make sure that everything the idle animation needs has already been loaded by the class loader.

Sign the Applet code using pfx certificate got Error?

I use my existing certificate (.pfx) to sign my applet code as follows (without any key gen. before, directly sign by this certificate)
jarsigner -storetype pkcs12 -keystore C:\mycert.pfx AppletCode.jar keyEntries
Although the code can be signed, when i view this page, it prompts me "Certificate not verified" and with error:
java.security.cert.CertificateException: Check leaf key usage failed in certificate.
What is wrong? Any body can help me?
* I try to geneate the self-certificate by keytool to sign my code, it can be viewed properly.

1) Check if your .pfx certificate has the following purposes (read it using the venerable Internet Explorer):
Ensures software came from software publisher
Protects software from alteration after publication
2) Put your certificate in the cacerts file

What's wrong in my applet code?

Hi!
I' ve a big problem with my applet. It doesn't works with some pc. For example: two same operative systems, same browsers and versions; one of that display applet without problems. The other pc (even if a jre is manually installed) doesn't show the applet, and it doesn't show me any errors.
The page who not show my applet, has this code (the applet code is commented!! Why???):

Help me please!!!
Thanks a lot, Francesca

and it doesn't show me any errorsMore important: is the plugin that should run the applet started? In ie you can set security in such a way
that active x controls are not started. You can install the jre but IE security will not allowe you to run it.
Can you try to get a full trace from a machine where the applet doesn't run?
To turn the full trace on you can start the java console, to be found here:
C:\Program Files\Java\j2re1.4...\bin\jpicpl32.exe
In the advanced tab you can fill in something for runtime parameters fill in this:
-Djavaplugin.trace=true -Djavaplugin.trace.option=basic|net|security|ext|liveconnect
The trace is here:
C:\Documents and Settings\your user\Application Data\Sun\Java\Deployment\log\plugin...log

APPLET CODE="test.jar"..

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