Run a java applet whitin a application ?

Is it possible for an application to start a java applet and run it inside the application, say on a Jpanel ?
Regards
Per

Yes. Just remember that it's now you who is responsible for calling init and start.
(there will be some problems if the applet calls methods like getCodeBase and getParameter)

Similar Messages

Running a Java Applet on Mac OS browser

I'm having trouble getting my Java Applet to work properly on the Mac OS version of IE5. Basicaly, the app fails to appear. Are there any do's and don'ts regarding the running of Java Applets on Mac Browsers?
I read somewhere that you can't send parameters through to the Applet. Is that true? I'm not trying to do this and it's still doesn't work.
Any help would be appreciated.

If anyone can help me with this problem I would be greatful.

Running a java applet from flash

Hi,
How do you run a java applet from within a Flash movie?
Is it necessary for the user to download a java interpreter, or is there an interpreter somehow built into their browser that can run applets?

I was wondering , I don't know too much about Flash
I remember seeing some classes in amongst the Flash
files when it installed , but couldn't tell you whart they
do (at the moment , but you've got me interested)
maybe you should rethink your strategy for building your page (and your movie) maybe build the movie around
your applet , or preload it then replace a an area of your movie area with your applet (the way you handle rollovers).
the advantage is you can make calls to applet methods
from Flash as it supports Javascript.
jus remember to set the scriptable <PARAM> to true
Users shouldn't have to download the plug-in or JRE
you should specify it in the OBJECT or EMBED tag so
if they don't have it , the browser will tell them.
of course this is going to change as Microsoft are stopping support for JAVA , users will then have to download the plug-in from Sun in order to view or use JAVA on the internet.

Using Java Applet in WebDynpro Application

Hello,
I have the problem that I must access the client in my WebDynpro Application.
But I found no way to include a Java Applet in my application, so my question: Is it generally possible to include a Java Applet or not?
If it is not possible with an Applet, is there any other way to access the client?
Thanks a lot

We actually embed Java applets in our application. But only on the portal.
Wrap the applet around a BSP.
Call the URL in an iframe.
To prevent the reloading problems that we see with applets and actions, we put the applet in a modal window, with an OK button at the bottom so that when applet processing is finished, the rest of the web dynpro functionality resumes.
If you need to have them both in the same page, you can embed the BSP iview in the same portal page.

Problems running any Java applets

I have tried uninstalling, and re-installing the latest version of Java...
any time I try and run an applet I get this error...
The publisher cannot be verified by a trusted source. Code will be treated as unsigned.
Name: loader
Java.io.EOFException
at java.io.DataInputStream.readInt(Unknown Source)
at sun.security.provider.JavaKeyStore.engineLoad(Unknown Source)
at sun.security.provider.JavaKeyStore$JKS.engineLoad(Unknown Source)
at java.security.KeyStore.load(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeploySigningCertStore.loadCertStore(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore.load(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore.load(Unknown Source)
at com.sun.deploy.security.ImmutableCertStore.load(Unknown Source)
at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
at sun.plugin.security.PluginClassLoader.getPermissions(Unknown Source)
at java.security.SecureClassLoader.getProtectionDomain(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$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
I tried looking at the java control pannel, and when I clicked on security, then certificates and I got this error
General Exception
java.io.EOFException
at java.io.DataInputStream.readInt(Unknown Source)
at sun.security.provider.JavaKeyStore.engineLoad(Unknown Source)
at sun.security.provider.JavaKeyStore$JKS.engineLoad(Unknown Source)
at java.security.KeyStore.load(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeploySigningCertStore.loadCertStore(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore.load(Unknown Source)
at com.sun.deploy.security.DeploySigningCertStore.load(Unknown Source)
at com.sun.deploy.panel.CertificatesInfo.reset(Unknown Source)
at com.sun.deploy.panel.CertificatesInfo.<init>(Unknown Source)
at com.sun.deploy.panel.CertificatesDialog.<init>(Unknown Source)
at com.sun.deploy.panel.SecurityPanel.certsBtnActionPerformed(Unknown Source)
at com.sun.deploy.panel.SecurityPanel.access$000(Unknown Source)
at com.sun.deploy.panel.SecurityPanel$1.actionPerformed(Unknown Source)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.AWTEventMulticaster.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.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)
The only way I am able to run a java applet is Unsigned...

I am having this same exact problem and receiving the same error anytime I try to run a java appet within any browser.
I cannot locate a keystore file or any other security certificate files. Also under Control Panel, If I run the Java Control Panel and then select the Security tab/certificates. I see a similar error and do not see any certificates. Any ideas on how to correct this.

Socket communication failure between Java applet and C++ application

I have a java applet that connects to a C++ application via Java's ServerSocket and Socket objects. THe C++ application is using the Winsock 2 API. The applet and application are running on an NT workstation (SP 6) and using IE (5.5) For a very simple C++ test applications the communictions work fine. Once more code gets added to the C++ application the portion of the socket that C++ listens to seems to close. Upon performing a recv call the return value is a zero. Microsoft insists this is a sign the Java side has shut down the socket. The Java applet can still receive messages from the C++ app but C++ cannot receive responses from the Java side. Java throws no exceptions and an explicit check of the socket shows no errors. Again, what puzzles me is that it works for simple C++ applications. Are there any known conflicts between Java and C++ in this regard?
I have inlcuded the basic java code segments below.
/ run Method.
* This method is called by the Thread.start() method. This
* method is required for the implementation of the Runnable interface
* This method sets up the server side socket communication and
* contiuously loops looking for requests from a external
* socket.
* @author Chris Duke
public void run(){
     // create socket connections
     boolean success = false;
     try {
         cServerSocket = new ServerSocket(cPortID);
         System.out.println("Waiting for client to connect...");
         cClientSocket = cServerSocket.accept();
         System.out.println("Client connected");
         // Create a stream to read from the client
         cInStream = new BufferedReader(new InputStreamReader(
           cClientSocket.getInputStream()));
         // Create a stream to write to the client
         cOutStream = new PrintWriter(
           cClientSocket.getOutputStream(), true);
         success = true;
     }catch (IOException e) {
         System.out.println("CommSocket:Run - Socket Exception(1) " + e);
         success = false;
     // if the socket was successfully created, keep the thread running
     while (success){
         try{
            // check socket to see if it is still available for reading
            if (cInStream != null && cInStream.ready()){
                // check for an incoming message
                String message = ReceiveMessage();
                // Send message to listeners
                Event(message);
            if (cInStream == null){
                success = false;
                System.out.println("CommSocket:Run - shutdown");
         }catch (IOException e){
            System.out.println("CommSocket:Run - Socket not ready exception");
            break;
// SendMessage method -
* Sends a text message to a connected listener through port specified by portID
* @author Chris Duke
* @param String message - This will be the message sent out through the server
* socket's port specified by portID.
   public void SendMessage(String message){
      cOutStream.println(message);
      if (cOutStream.checkError() == true)
        System.out.println("SendMessage : Flush = Error");
      else{
        System.out.println("SendMessage : Flush - No Error");
   }

a very simple C++ test applications the communictions work fine. Once more code gets added to the C++ application the portion of the socket that C++ listens to seems to close.
This quite strongly implicates the extra code in the C++ App. The firstly thing I would try would be telnet. Try connecting to both versions of the C++ Application and manually reproducing a proper exchange.
a recv call the return value is a zero. Microsoft insists this is a sign the Java side has shut down the socket.
A correct implementation of recv should return the number of bytes received, or -1 for an error. A zero return indicates no bytes received not a socket closed/error. This sounds like FUD to me.
Are there any known conflicts between Java and C++ in this regard?
I can see no obvious faults, though the code is incomplete, I don't think it's an sockets implementation issue, at either end, it sounds more likely to be a protocol/handshaking bug in the C++ App.

How to run a Java applet on a website.

Hi,
I am trying to run the code below [DrawLines.java|http://www.dgp.toronto.edu/~mjmcguff/learn/java/01-drawingLines/]
import java.applet.*;
import java.awt.*;
public class DrawingLines extends Applet {
   int width, height;
   public void init() {
      width = getSize().width;
      height = getSize().height;
      setBackground( Color.black );
   public void paint( Graphics g ) {
      g.setColor( Color.green );
      for ( int i = 0; i < 10; ++i ) {
         g.drawLine( width, height, i * width / 10, 0 );
on my website . I compiled it using JDK1.6.0_21 on Windows 7 and generated DrawingLines.class (My site is hosted on a linux server, is this an issue since it was compiled on Windows?)
I created a html file:
<applet width=300 height=300 code="/shanegibney/classes/DrawingLines.class"> </applet>Then I created a new folder called 'classes' in my public directory.
I get the following error:
java.lang.NoClassDefFoundError: /shanegibney/classes/DrawingLines (wrong name: DrawingLines)
     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 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.NoClassDefFoundError: /shanegibney/classes/DrawingLines (wrong name: DrawingLines)I'm sure adding a java applet is very common. Does anyone have any ideas why this isn't working? It can be seen here .
Any help would be greatly appreciated,
Thanks,
Shane
Edited by: ofey on Jul 9, 2010 4:21 PM

I believe it's interpreting some of the code attribute as a path. Try this:
<applet width=300 height=300 codebase="/shanegibney/classes/" code="DrawingLines"> </applet>

Problem Running a java applet from an HTML page

I can run my applet at the command prompt with:
appletviewer coffee.html
But when I try and open the Coffee.html by opening
the page in Internet Explorer I get the following message:
Can't find Database driver class: java.lang.ClassNotFoundException: sun.jdbc.odbc.JdbcOdbcDriver
Code: createcoffees.java
import java.applet.*;
import java.sql.*;
public class CreateCoffees extends Applet{
     public void init() {
          Statement stmt;
          Connection con;
          try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          } catch(java.lang.ClassNotFoundException e) {
               System.err.print("ClassNotFoundException: ");
               System.err.println(e.getMessage());
          try {con = DriverManager.getConnection("jdbc:odbc:hq","afm", "afm");
               stmt = con.createStatement();
                      stmt.executeQuery("SELECT * FROM RM");
               stmt.close();
               con.close();
          } catch(SQLException ex) {
               System.err.println("SQLException: " + ex.getMessage());
}

Is your jdbc-odbc driver properly loaded? Its very clear that its a class not found exception which is thrown by this:
try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch(java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());

Is running local Java applets disabled in Safari 6?

Ever since updating to Mountain Lion—and Safari 6—locally stored Java applets don't work any more. A quick test in JavaScript:
navigator.javaEnabled();
returns FALSE if the page is on the file server, and TRUE if the exact same page comes from a web server. Unfortunately these pages can't be delivered over a web server, they have to run from a file server.
Anyone know how to get applets to run locally in Safari? I've opened up Gatekeeper to run all apps and poked around the Java settings to no luck. I don't even get a "Inactive Plug-in" message, just...nothing. Am running both the Apple JRE6 as well as the most recent Oracle version 7u7.
Cheers

Java is locked down SO tightly now. I had local Java applets that ran fine in Firefox but wouldn't run in Safari. My friend did a little troubleshooting with me and figured this out:
1) In Safari > Preferences > Advanced, check "Show Develop menu in menu bar"
2) In Safari > Develop, select "Disable Local File Restriction"
Hope this helps!

I can't run signed Java Applets

HI
I have a java applet where I need to have acces to a local file, but I can't get IE to run the applet. (IE do not come with the Secutiy Warning window.)
From the homepage, I run the applet via:
<applet name=read_file code="read_file.class" width="0" height="0">
<script language="JavaScript">
document.read_file.file_read();
</script>
And the java code is:
import java.applet.*;
import java.awt.*;
import java.io.*;
public class read_file extends Applet{
     public char[][] ip;
     public int counter;
     public String te="dette er en java test";
public void init() {
public void file_read() {
     String str;
     counter =0;
     try {
     BufferedReader in = new BufferedReader(new FileReader("c:\test\config.txt"));
          while ((str = in.readLine()) != null){
               ip[counter] = str.toCharArray();
               counter++;
          in.close();
     } catch(IOException e) {
public void test() {
I have signed the cab file with:
"C:\Program Files\Microsoft.NET\SDK\v1.1\Bin\signcode.exe" -j "C:\Program Files\Microsoft.NET\SDK\v1.1\Bin\JAVASIGN.DLL" -jp High -v hjl.pvk -spc hjl.spc -n "oil" -i "www.vedikke endnu-.dk" "C:\Documents and Settings\rbn\Desktop\UIp\hjemmeside\read_file.cab"
and maket the cab fil with:
"C:\Documents and Settings\rbn\Desktop\UIp\cab\BIN\MAKECAB.EXE" "C:\Documents and Settings\rbn\Desktop\UIp\java\read_file.class" "C:\Documents and Settings\rbn\Desktop\UIp\hjemmeside\read_file.cab"
What do I need to different ?

I see no reason why you want to make this applet for the msjvm, here is how you do it with the sun sdk:
Signing applets:
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post and last post for the java class file
http://forum.java.sun.com/thread.jsp?forum=63&thread=409341
4th post explaining how to set up your own policy with your own keystore
(my copy and paste fingers are really getting tired now, copyd and pasted this
for about a 100 times now)
Notice some differences in the html code of the examples (they don't use the applet tag)
If you're aiming for the msjvm because you don't want any support form MS in
the near future and want to delever a legacy unsupported unmaintainable applet
than I have to ask you how you compiled the applet. If you used the SUN sdk
then are you aware that the msjvm cannot handle java version higher than 1.1?
So you have to compile it like this: javac -source 1.3 -target 1.1 ....
Your html file seems to be missng the cabbase value so how do you expect
IE to find the cab file?

Can't get Safari 5.1.1 to run a java applet from Ubuntu Server with unsigned cert

Hi there, I am trying to run a Webmin control panel in the latest safari and no matter what I do, I keep getting this error message:
Works fine in Latest Chrome. I am running latest Lion and would like to use Safari as my main browser, but if I can't fix it to run a java widget, what to do?
thx!!!

here's the fix:http://artur.ejsmont.org/blog/content/how-to-import-self-signed-ssl-certificate- to-java-keystore-adding-https-certificate
Only when I run the command:
iMac:security FCPX$ sudo $JAVA_HOME/bin/keytool -import -file certfile.txt -keystore /Library/Java/Home/lib/security/cacerts
I get this:
Password:
sudo: /bin/keytool: command not found
iMac:security FCPX$
any thoughts?

Firefox 5.0 consistently crashes when trying to run a java applet

Trying to run a program with JAVA webstart, Firefox crashes. Java version is correct (as verified by Java test).
repeatable every time.
Sometimes does not generate a crash report (50% of time).

Try logging in to a different user account on the same computer. Does Safari have the same problem?

How can I stop Firefox from running a Java applet from a site that I no longer trust?

I've found plenty of answers to the opposite question (at <https://support.mozilla.org/en-US/questions/963349> and <https://support.mozilla.org/en-US/kb/how-allow-java-trusted-sites>, among other places), but none for my question.
Firefox apparently builds a list of trusted sites for Java using its "Allow and Remember" dialog, but gives no easy way to edit that list (other than adding more sites to it). What am I supposed to do if I clicked "Allow and Remember" at some time in the past, and now want to revoke that permission?

You can inspect and manage permissions for the domain in the currently selected tab via these steps:
*Click the "[[Site Identity Button|Site Identity Button]]" (globe/padlock) on the location/address bar
*Click "More Information" to open "Tools > Page Info" with the Security tab selected
*Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab
You can also clear the Java cache.
*http://www.java.com/en/download/help/5000020300.xml - How do I clear the Java cache?
*Control Panel > Java > General tab > "Temporary Internet Files" > Settings > Delete Files
1

Java applets won't run on Safari???

I have reinstalled Java twice, and it still won't run any Java applets. It just sits there with the cup logo and the arrow on either side. It works fine on Firefox but not Safari. Help?

Hello
I'm piggy backing on this thread because I too have had problems with Java and Safari
Java runs fine for me in Firefox, however.
I went to a federal website
https://blrscr3.egs-seg.gc.ca/gol-ged/gov/browserdetection/BrowserCheck.html
that uses java and received this message
" Java applet unable to load
To use this service, you must either install a recent version of the Sun JVM or enable "Scripting of Java applets" if it has been disabled."
so i looked for an update and have downloaded and installed release 6, (at least, it said that it was installed, but have never been able to figure out where)
when I check Java preferences, the choices are J2SE 1.4.2 or J2SE 5, and when I've switched to 1.4.2 I still have no luck.
When i run firefox, i get the java console opening, but it doesn't open with safari, and I can't find the option for this to turn on in safari
i have restarted both safari and my computer and no luck. I have repaired permissions and no changes have taken place.
Any more suggestions?
(thank you, by the way)

Safari 6.0.4 - java applet keeps running when not in use?

Mac OS X 10.7.5
Safari 6.0.4
all the latest updates (software) as of 4/27/13
Oracle's Java r 21 also installed (latest)
website: http://javatester.org/version.html
NOTE: I have seen this on more than 1 computer that the 1st time running the Java applet (after clicking on the plugin missing placeholder, the app appears to begin loading, but 'hangs' as far as UI is concerned, although it is using CPU and accessing the disk the whole time.
Refreshing the page then allows you to see the Oracle java version displayed in the pink box
However, what I notice is that if you enter a new URL and go there, blowing away the Java applet page, guess what's still running in the background (via Activity Monitor) "Java Applet - javatester.org", occupying memory and using some small CPU.
this seems like ridiculously bad behavior in general. Has anyone else seen similar issues? is this related to an outstanding memory leak (bigger problem) in Safari? Any way to get java to behave if you aren't possibly using an applet?
could it be lazy cleanup/garbage collection in Safari? meaning it might vanish from the process list at some indeterminate point in the future? closing the tab it was running on (before a new URL was loaded) outright doesn't seem to kill it.

I have not used Onyx recently, although i use a number of other utils, and reset safari periodically.
It seems that it may be a delayed garbage collection issue. If I leave it for a bit and then come back it seems that the process is disappearing. If I can isolate anything more reliably I'll post again, but for now I'm going to stop worrying about it.
It was lingering long enough I thought maybe was a leak, but i guess I'm just not patient enough...
Also, I haven't reliably reproduced the high CPU cycle / hung applet condition on the 1st load. that may be something that shouldn't be going on (regarding the new security around java probably) but low pain point once I reload the page and tell safari to let the app run all the time.
so just to recap
- looks like the applet persistence in the process table is a delayed disposal issue that eventually gets done
- hanging applet on 1st load post security patch may be something, but hitting cmd-R is a lot more satisfying than devoting a lot of time to tracking that down right now
thanks for your suggestion

Run a java applet whitin a application ?

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