Java applet won't run: ClassFormatError: Unknown constant tag 115
Hi,
About two years ago I uploaded an applet to a server and it ran fine. Since then I've done minor tweaks to the applet and it works on my computer, but I recently uploaded it to a new server and now it gives me the following:
java.lang.ClassFormatError: Unknown constant tag 115 in class file chemlet
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(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.ClassFormatError: Unknown constant tag 115 in class file chemlet
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(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've already checked that I uploaded everything in binary and that my .class files are intact on the server. In fact I uploaded my files and downloaded them back onto my computer and they run fine. Also I have another applet running smoothly on the same server (which also used to reside on the old server) and it's not having any problems. I have 9 .class files in total and all of them are uploaded. chemlet is the file where execution should start. Any ideas for what to do?
Thanks in advance.
Either there is some version problem in applet. or the classfile might have some constant which is not getting referenced properly.
might be in your chemlet file . use decompiler to open your class file and then check the line number 115 in your chemlet file to see what is the problem there.
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+#+
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--------------- T H R E A D ---------------
+Current thread (0x01da8c00): JavaThread "main" [_thread_in_native, id=2380, stack(0x02420000,0x02620000)]+
siginfo: ExceptionCode=0xc0000005, writing address 0x00000024
Registers:
EAX=0x00000024, EBX=0x33827b58, ECX=0x7c38b4e8, EDX=0x7efeff3d
ESP=0x02616090, EBP=0x026160a4, ESI=0x00000024, EDI=0x00000020
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Top of Stack: (sp=0x02616090)
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+0x026160a0: 026160e4 026160ec 7c34f639 00000020+
+0x026160b0: 7c36b73f 00000000 6d1db83c 02616236+
+0x026160c0: 00000000 33827b58 7c38b548 026160b8+
+0x026160d0: 0000000d 026160bc 02615b4c 026165e0+
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+0x776677b2: f0 0f ba 30 00 0f 83 eb e2 00 00 64 a1 18 00 00+
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j com.sun.deploy.config.Config.versionUpdateCheck()V392+
j com.sun.deploy.config.Config.initialize()Z256+
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Heap
def new generation total 4928K, used 281K [0x317e0000, 0x31d30000, 0x32280000)
eden space 4416K, 6% used [0x317e0000, 0x31826480, 0x31c30000)
from space 512K, 0% used [0x31c30000, 0x31c30000, 0x31cb0000)
to space 512K, 0% used [0x31cb0000, 0x31cb0000, 0x31d30000)
tenured generation total 10944K, used 0K [0x32280000, 0x32d30000, 0x337e0000)
the space 10944K, 0% used [0x32280000, 0x32280000, 0x32280200, 0x32d30000)
compacting perm gen total 12288K, used 371K [0x337e0000, 0x343e0000, 0x377e0000)
the space 12288K, 3% used [0x337e0000, 0x3383cc08, 0x3383ce00, 0x343e0000)
ro space 10240K, 51% used [0x377e0000, 0x37d0dff8, 0x37d0e000, 0x381e0000)
rw space 12288K, 55% used [0x381e0000, 0x3887c208, 0x3887c400, 0x38de0000)
Code Cache [0x0c910000, 0x0c980000, 0x0e910000)
total_blobs=147 nmethods=5 adapters=79 free_code_cache=33098880 largest_free_block=0
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+0x75e10000 - 0x75edc000 C:\Windows\system32\MSCTF.dll+
+0x66850000 - 0x67195000 C:\Windows\system32\IEFRAME.dll+
+0x77240000 - 0x77245000 C:\Windows\system32\PSAPI.DLL+
+0x73850000 - 0x7388c000 C:\Windows\system32\OLEACC.dll+
+0x743d0000 - 0x7456e000 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.17514_none_41e6975e2bd6f2b2\comctl32.dll+
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+0x77760000 - 0x77795000 C:\Windows\system32\WS2_32.dll+
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+0x63ef0000 - 0x64aa8000 C:\Windows\system32\MSHTML.dll+
+0x74cb0000 - 0x74cb9000 C:\Windows\system32\VERSION.dll+
+0x6f5f0000 - 0x6f6aa000 C:\Windows\system32\d2d1.dll+
+0x6c8a0000 - 0x6c9aa000 C:\Windows\system32\DWrite.dll+
+0x6d3c0000 - 0x6d443000 C:\Windows\system32\dxgi.dll+
+0x739d0000 - 0x739e3000 C:\Windows\system32\dwmapi.dll+
+0x75300000 - 0x75316000 C:\Windows\system32\CRYPTSP.dll+
+0x758d0000 - 0x758fd000 C:\Windows\system32\WINTRUST.dll+
+0x75950000 - 0x75a6d000 C:\Windows\system32\CRYPT32.dll+
+0x75830000 - 0x7583c000 C:\Windows\system32\MSASN1.dll+
+0x74b70000 - 0x74b91000 C:\Windows\system32\ntmarta.dll+
+0x76030000 - 0x76075000 C:\Windows\system32\WLDAP32.dll+
+0x75000000 - 0x7503b000 C:\Windows\system32\rsaenh.dll+
+0x75ae0000 - 0x75b63000 C:\Windows\system32\CLBCatQ.DLL+
+0x69240000 - 0x69272000 C:\Program Files\Internet Explorer\ieproxy.dll+
+0x756f0000 - 0x7573c000 C:\Windows\system32\apphelp.dll+
+0x74130000 - 0x74263000 C:\Windows\System32\msxml3.dll+
+0x75750000 - 0x757af000 C:\Windows\system32\SXS.DLL+
+0x73d90000 - 0x73d9b000 C:\Windows\system32\msimtf.dll+
+0x6d390000 - 0x6d3bb000 C:\Windows\system32\msls31.dll+
+0x77320000 - 0x774bd000 C:\Windows\system32\setupapi.dll+
+0x75920000 - 0x75947000 C:\Windows\system32\CFGMGR32.dll+
+0x75900000 - 0x75912000 C:\Windows\system32\DEVOBJ.dll+
+0x73570000 - 0x7359c000 C:\Windows\system32\d3d10_1.dll+
+0x734b0000 - 0x734ea000 C:\Windows\system32\d3d10_1core.dll+
+0x6c770000 - 0x6c89c000 C:\Windows\system32\D3D10Warp.dll+
+0x69760000 - 0x6978e000 C:\Windows\system32\MLANG.dll+
+0x74970000 - 0x74a65000 C:\Windows\system32\PROPSYS.dll+
+0x6ab00000 - 0x6ac02000 C:\Windows\system32\d3d10.dll+
+0x73520000 - 0x73553000 C:\Windows\system32\d3d10core.dll+
+0x73d40000 - 0x73d80000 C:\Windows\system32\UxTheme.dll+
+0x73180000 - 0x731d2000 C:\Windows\system32\RASAPI32.dll+
+0x73160000 - 0x73175000 C:\Windows\system32\rasman.dll+
+0x73150000 - 0x7315d000 C:\Windows\system32\rtutils.dll+
+0x6f6b0000 - 0x6f6b6000 C:\Windows\system32\sensapi.dll+
+0x75190000 - 0x751cc000 C:\Windows\system32\mswsock.dll+
+0x74d40000 - 0x74d45000 C:\Windows\System32\wshtcpip.dll+
+0x747f0000 - 0x74815000 C:\Windows\system32\peerdist.dll+
+0x74e00000 - 0x74e17000 C:\Windows\system32\USERENV.dll+
+0x753f0000 - 0x7540b000 C:\Windows\system32\AUTHZ.dll+
+0x747e0000 - 0x747f0000 C:\Windows\system32\NLAapi.dll+
+0x72330000 - 0x72336000 C:\Windows\system32\rasadhlp.dll+
+0x75180000 - 0x75186000 C:\Windows\System32\wship6.dll+
+0x72b90000 - 0x72bc8000 C:\Windows\System32\fwpuclnt.dll+
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+0x694b0000 - 0x69597000 C:\Windows\system32\DDRAW.dll+
+0x742d0000 - 0x742d6000 C:\Windows\system32\DCIMAN32.dll+
+0x6c710000 - 0x6c769000 C:\Windows\System32\Dxtmsft.dll+
+0x73a00000 - 0x73afb000 C:\Windows\system32\windowscodecs.dll+
+0x6cf70000 - 0x6cfa2000 C:\Windows\system32\WINMM.dll+
+0x739a0000 - 0x739cf000 C:\Windows\system32\XmlLite.dll+
+0x74310000 - 0x74317000 C:\Windows\system32\msiltcfg.dll+
+0x6c410000 - 0x6c650000 C:\Windows\system32\msi.dll+
+0x6ac70000 - 0x6acb7000 C:\Windows\system32\Adobe\Director\SwDir.dll+
+0x6c6d0000 - 0x6c703000 C:\Windows\system32\windowscodecsext.dll+
+0x69790000 - 0x69809000 C:\Windows\system32\mscms.dll+
+0x6ac30000 - 0x6ac68000 C:\Windows\system32\icm32.dll+
+0x69410000 - 0x694ad000 C:\Windows\system32\Adobe\Shockwave 11\Control.dll+
+0x6e810000 - 0x6e861000 C:\Windows\system32\winspool.drv+
+0x69390000 - 0x69402000 C:\Windows\system32\DSOUND.dll+
+0x74ac0000 - 0x74ae5000 C:\Windows\system32\POWRPROF.dll+
+0x74a70000 - 0x74aa9000 C:\Windows\System32\MMDevApi.dll+
+0x73960000 - 0x73996000 C:\Windows\system32\AUDIOSES.DLL+
+0x736e0000 - 0x736ec000 C:\Windows\system32\mssprxy.dll+
+0x69320000 - 0x6938a000 C:\Windows\system32\vbscript.dll+
+0x653b0000 - 0x659de000 C:\Windows\system32\Macromed\Flash\Flash10t.ocx+
+0x74f70000 - 0x74f78000 C:\Windows\system32\credssp.dll+
+0x74f20000 - 0x74f5a000 C:\Windows\system32\schannel.DLL+
+0x67430000 - 0x674f8000 C:\Windows\system32\OPENGL32.DLL+
+0x68ce0000 - 0x68d02000 C:\Windows\system32\GLU32.dll+
+0x10000000 - 0x10dc0000 C:\Windows\system32\ig4icd32.dll+
+0x68c70000 - 0x68cd4000 C:\Windows\system32\D3DIM.DLL+
+0x67360000 - 0x6742c000 C:\Windows\system32\D3DIM700.DLL+
+0x01d40000 - 0x01d5f000 C:\Program Files\Java\jre6\bin\jp2iexp.dll+
+0x7c340000 - 0x7c396000 C:\Program Files\Java\jre6\bin\MSVCR71.dll+
+0x72d30000 - 0x72d37000 C:\Windows\system32\wsock32.dll+
+0x71b10000 - 0x71b20000 C:\Windows\system32\napinsp.dll+
+0x71af0000 - 0x71b02000 C:\Windows\system32\pnrpnsp.dll+
+0x720d0000 - 0x720d8000 C:\Windows\System32\winrnr.dll+
+0x71ae0000 - 0x71aed000 C:\Windows\system32\wshbth.dll+
+0x6f8f0000 - 0x6f974000 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_5.82.7601.17514_none_ec83dffa859149af\comctl32.dll+
+0x6d7f0000 - 0x6da9f000 C:\PROGRA~1\Java\jre6\bin\client\jvm.dll+
+0x6d7a0000 - 0x6d7ac000 C:\PROGRA~1\Java\jre6\bin\verify.dll+
+0x6d320000 - 0x6d33f000 C:\PROGRA~1\Java\jre6\bin\java.dll+
+0x6d7e0000 - 0x6d7ef000 C:\PROGRA~1\Java\jre6\bin\zip.dll+
+0x01dc0000 - 0x01dc6000 C:\Program Files\Java\jre6\bin\jp2native.dll+
+0x6d1d0000 - 0x6d1e3000 C:\Program Files\Java\jre6\bin\deploy.dll+
VM Arguments:
jvm_args: -Xbootclasspath/a:C:\PROGRA~1\Java\jre6\lib\deploy.jar;C:\PROGRA~1\Java\jre6\lib\javaws.jar;C:\PROGRA~1\Java\jre6\lib\plugin.jar -Xmx32m -Djava.awt.headless=true -Dkernel.background.download=false -Dkernel.download.dialog=false -XX:MaxDirectMemorySize=64m
java_command: <unknown>
Launcher Type: generic
Environment Variables:
PATH=C:\Program Files\Internet Explorer;;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\system32\Empirum
USERNAME=%username%
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 6 Model 42 Stepping 7, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows 7 Build 7601 Service Pack 1
CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 42 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, ht
Memory: 4k page, physical 3063864k(2285416k free), swap 6125972k(5328168k free)
vm_info: Java HotSpot(TM) Client VM (20.1-b02) for windows-x86 JRE (1.6.0_26-b03), built on May 4 2011 00:50:59 by "java_re" with MS VC+ 7.1 (VS2003)+
time: Thu Jun 30 17:20:35 2011
elapsed time: 0 secondsuser11262844 wrote:
Since we're planning a corporate Windows 7 rollout (>800PCs) we cannot do this manually on every computer. Ther must be any solution for this problem.If you're doing a corporate rollout of that size then surely you're just making an image of the desired configuration and just duplicating it onto the 800 PCs? In which case you would just configure IE appropriately as part of the image.
Or alternatively you are manually configuring each of the 800 PCs, in which case this would be just one more thing in the checklist. -
File Uploader Java Applet cannot be run
I have a website that I need to upload PDFs to, but since ugrading to Lion, I cannot do it any more. I have downloaded the separte Java app, but it still does not work.
This is the error message I get:
File Uploader Java Applet cannot be run. Make sure that Java is installed on your PC and Java applets are permitted in browser settings. Use this link to download and install appropriate version of Java:Thank you etresoft - that did not solve the problem. However, I did fix it by changing something in Java Preferences (which is located in the Utilities Folder).
I first deleted the cache files as you suggested in the Network tab. Then I quit and restarted Firefox. I still got the same error message when I tried to upload.
Then, I went back into Java Preferences and checked the box, "Enable Appplet Plug-in and Webstart Applications" located in the General Tab. I then quit and restarted Firefox. Now I am able to upload documents as I could before Lion.
Thank you!! -
Class Not Found Exception - applet won't run anywhere outside of IDE
I have an applet that runs perfectly in the netbeans IDE, but won't run from command prompt (I'm using windows) or from a browser. I've been banging my head against the wall for a few days on this one. Here's the HTML I'm using:
<applet width="400" height="525" code="musicapplet.class" archive="crypticgraffiti.jar">
<param name="bgcolor" value="ffffff"> <param name="fontcolor" value="000000">
</param> </param> Your browser is not Java enabled. </applet>
Here is the structure of the jar file's contents:
META-INF/
META-INF/MANIFEST.MF
com/
com/crypticgraffiti/
com/crypticgraffiti/music/musicapplet
com/crypticgraffiti/music/GetNotes.class
com/crypticgraffiti/music/InstList.class
com/crypticgraffiti/music/Mode.class
com/crypticgraffiti/music/MusicCreator.class
com/crypticgraffiti/music/OctaveTransformer.class
com/crypticgraffiti/music/Phrase.class
musicapplet/MusicApplet$playerThread.class
musicapplet/MusicApplet.class
(Musicapplet.class is the main class)
When I attempt to run from command prompt, I get:
"Error: Could not find or load main class crypticgraffiti.MusicApplet"
When I attempt to load via html:
"basic: load: class musicapplet.class not found.
load: class musicapplet.class not found.
java.lang.ClassNotFoundException: musicapplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: musicapplet.class
security: Accessing keys and certificate in Mozilla user profile: null"
I have tried every possible variation for the 'code' element of the applet tag (package.mainclass.class, mainclass, mainclass.class, etc). I have also tried compiling with JDK 1.6 and this didn't change anything. I've tried clearing out the cache of temporary files using the java control panel settings, and have verified that my browser can run other applets using JRE 6 and 7.
I've tried some different ways of distributing the applet, also: putting all the class files in the folder with the html file, putting the classes in a source folder in the same folder as the html file, and finally putting a jar in the same folder as the html file (which really seems the simplest).
Any help at all would be most appreciated! This applet is a very cool and original music creating app that draws heavily on the JFugue API. It's a shame that I can't get it online for people to play with!Cryptic Graffiti wrote:
Here is the structure of the jar file's contents:
META-INF/
META-INF/MANIFEST.MF
com/
com/crypticgraffiti/
com/crypticgraffiti/music/musicapplet
com/crypticgraffiti/music/GetNotes.class
com/crypticgraffiti/music/InstList.class
com/crypticgraffiti/music/Mode.class
com/crypticgraffiti/music/MusicCreator.class
com/crypticgraffiti/music/OctaveTransformer.class
com/crypticgraffiti/music/Phrase.class
musicapplet/MusicApplet$playerThread.class
musicapplet/MusicApplet.class
(Musicapplet.class is the main class)
Please note that class names are case sensitive so "MusicApplet" is not same as "Musicapplet" or "musicapplet". Your applet tag should have fully qualified class name (without quotes) and should look like this:
<applet width=400 height=525 code=musicapplet.MusicApplet archive="crypticgraffiti.jar">
</applet>
The JAR should be in the same directory as your HTML file. While launching from command line, you can also check if your JAR file is getting included in classpath.
Thanks,
Nitin -
This is a modified version of a tutorial I've been working with. Code for Main.java:
import javax.swing.*;
public class Main {
* @param args the command line arguments
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame("Swing Paint Demo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300,300);
f.setVisible(true);
Problem is that when I try to load the applet into an html file:
<html>
<APPLET code="Main.class"></APPLET>
</html>
It doesn't load.
The file compiles and executes as a stand alone .jar, but when I try to run it as an applet it won't work.
I know I'm probably missing an easy step. I have already checked my IE7 settings and java is enabled. I have no problem with any other java applets, just the ones I make. haha. Thank you ahead of time.I did some research, and got a new tutorial because the old one was inappropriate like you pointed out previously. This one I copy pasted into my editor, it compiled fine. I run it through my browser and it doesn't work still. Same issue, coincidentally, what do you make of it?import javax.swing.JApplet;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
//Since we're adding a Swing component, we now need to
//extend JApplet. We need to be careful to access
//components only on the event-dispatching thread.
public class Main extends JApplet {
JTextField field;
public void init() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
createGUI();
} catch (Exception e) {
System.err.println("createGUI didn't successfully complete");
addItem(false, "initializing... ");
private void createGUI() {
//Create the text field and make it uneditable.
field = new JTextField();
field.setEditable(false);
//Set the layout manager so that the text field will be
//as wide as possible.
setLayout(new java.awt.GridLayout(1,0));
//Add the text field to the applet.
add(field);
public void start() {
addItem(false, "starting... ");
public void stop() {
addItem(false, "stopping... ");
public void destroy() {
addItem(false, "preparing for unloading...");
cleanUp();
private void cleanUp() {
//Execute a job on the event-dispatching thread:
//taking the text field out of this applet.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
remove(field);
} catch (Exception e) {
System.err.println("cleanUp didn't successfully complete");
field = null;
private void addItem(boolean alreadyInEDT, String newWord) {
if (alreadyInEDT) {
addItem(newWord);
} else {
final String word = newWord;
//Execute a job on the event-dispatching thread:
//invoking addItem(newWord).
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
addItem(word);
} catch (Exception e) {
System.err.println("addItem didn't successfully complete");
//Invoke this method ONLY from the event-dispatching thread.
private void addItem(String newWord) {
String t = field.getText();
System.out.println(newWord);
field.setText(t + newWord);
} -
Java applet won't load on browser
God, I've never been this frustrated with Java before.
Ok, I created an applet in my eclipse IDE and ran it. It works. I decided to create a HTML file so that the applet would display on my firefox browser (my browser has no problem displaying java applets. All settings are fine).
This is my HTML code:
<html>
<title>Site Selector</title>
<body>
<applet code = "SiteTesting.class" width = "300" height = "75">
</applet>
</body>
</html>Now, my eclipse IDE creates a "src" or source folder and a bin folder. The bin folder is where the class files are kept. The HTML file was in the src folder. When I ran it, I got this:
load: class SiteTesting.class not found.
java.lang.ClassNotFoundException: SiteTesting.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)
Caused by: java.io.FileNotFoundException: F:\Workspace\RefreshalCourse\src\networking\SiteTesting\class.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: SiteTesting.classMakes sense, considering the class file isn't in the src folder. So I copied the class files into the src folder, ran the HTML file, and I got this:
java.lang.NoClassDefFoundError: SiteTesting (wrong name: networking/SiteTesting)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: SiteTesting (wrong name: networking/SiteTesting)Huh. I took the html file and placed it in the bin folder where the class file was and I ran it and got the exact same error message above.
I'm obviously doing something wrong. So, any help in fixing this will be most appreciated. CheersYour java file starts with:
package networking;Right?
If so, the fully qualified name name of your class is networking.SiteTesting.
Use this in the applet tag:
<applet code = "networking.SiteTesting" width = "300" height = "75">Suppose you have your html file in the directory zzz.
Put SiteTesting.class in zzz/networking/, like this:
zzz/whatever.html
zzz/networking/SiteTesting.class -
Java Applet fails to run after JRE upgrade
I had JRE 1.6 which was updated to 1.8.0_31. After this update my applet has stopped working and I am getting below error
java.lang.ExceptionInInitializerError
at com.sun.deploy.net.protocol.https.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.net.www.protocol.jar.JarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.access$600(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: sun.security.ssl.X509TrustManagerImpl cannot be cast to com.sun.net.ssl.internal.ssl.X509ExtendedTrustManager
at com.sun.deploy.security.X509ExtendedDeployTrustManager.<init>(Unknown Source)
at com.sun.deploy.net.protocol.https.Handler$Initializer$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.net.protocol.https.Handler$Initializer.<clinit>(Unknown Source)
... 29 more
Exception: java.lang.ExceptionInInitializerError
java.lang.NoClassDefFoundError: Could not initialize class com.sun.deploy.net.protocol.https.Handler$Initializer
at com.sun.deploy.net.protocol.https.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.net.www.protocol.jar.JarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.access$600(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: Could not initialize class com.sun.deploy.net.protocol.https.Handler$Initializer
I am using Jboss server and the server.xml file has been updated to use the correct Keystore and certificate using SSL. Below is what I am Using:
<Connector protocol="HTTP/1.1" SSLEnabled="true"
port="8443" address="${jboss.bind.address}"
scheme="https" secure="true" clientAuth="false"
keystoreFile="${jboss.server.home.dir}/conf/XYZ.keystore"
keystorePass="XXX" sslProtocol = "TLS" />
I have added the https site which I am trying to access in the exception list of both the browser and JAVA control Panel. Cleared the cache of both and have also deleted the user certificate to ensure the latest certificate gets downloaded.
Kindly help to know the resolution steps.I had JRE 1.6 which was updated to 1.8.0_31. After this update my applet has stopped working and I am getting below error
java.lang.ExceptionInInitializerError
at com.sun.deploy.net.protocol.https.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.net.www.protocol.jar.JarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.access$600(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: sun.security.ssl.X509TrustManagerImpl cannot be cast to com.sun.net.ssl.internal.ssl.X509ExtendedTrustManager
at com.sun.deploy.security.X509ExtendedDeployTrustManager.<init>(Unknown Source)
at com.sun.deploy.net.protocol.https.Handler$Initializer$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.net.protocol.https.Handler$Initializer.<clinit>(Unknown Source)
... 29 more
Exception: java.lang.ExceptionInInitializerError
java.lang.NoClassDefFoundError: Could not initialize class com.sun.deploy.net.protocol.https.Handler$Initializer
at com.sun.deploy.net.protocol.https.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.net.www.protocol.jar.JarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.<init>(Unknown Source)
at sun.plugin.net.protocol.jar.Handler.openConnection(Unknown Source)
at java.net.URL.openConnection(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.access$600(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at sun.misc.URLClassPath$JarLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: Could not initialize class com.sun.deploy.net.protocol.https.Handler$Initializer
I am using Jboss server and the server.xml file has been updated to use the correct Keystore and certificate using SSL. Below is what I am Using:
<Connector protocol="HTTP/1.1" SSLEnabled="true"
port="8443" address="${jboss.bind.address}"
scheme="https" secure="true" clientAuth="false"
keystoreFile="${jboss.server.home.dir}/conf/XYZ.keystore"
keystorePass="XXX" sslProtocol = "TLS" />
I have added the https site which I am trying to access in the exception list of both the browser and JAVA control Panel. Cleared the cache of both and have also deleted the user certificate to ensure the latest certificate gets downloaded.
Kindly help to know the resolution steps. -
I try to use this site http://www.csupomona.edu/%7Ewgverbrugge/Billweb/TestAPPS/SimulatedMach/MachineUI.html
It says load: class MachineUI.class not found.
load: class MachineUI.class not found.
java.lang.ClassNotFoundException: MachineUI.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)
basic: Exception: java.lang.ClassNotFoundException: MachineUI.class
java.lang.ClassNotFoundException: MachineUI.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
basic: Modality pushed
basic: Modality popped
... 10 moreEJP wrote:
'this.document' is a predefined variable that defines the URL source of the current page. If you are referring to the predefined variable that provides access to the Document Object Model then I believe you are mistaken, that is 'window.document' or just 'document'.
EJP wrote:
Your name either conflicts with that or is getting confused with it somewhere.The 'document' variable is a parent of the window object e.g. 'window.document' but my variable has the context of 'this'. That means 'this.document.URL' returns 'undefined' instead of the URL for the current page.
JavaScript is also case sensitive so 'document.URL' is not the same as 'Document.URL', the last of which returns 'undefined'.
If Java relealy was confusing my variable with the predfined one then I would expect the same behaviour if I were to use differnt variations of the variable. However the follwoing JavaScript doesnt affect the Applet in anyway:
<script type="text/javascript" language="javascript">
//this.Document = 'string'; // Remove this line to get it to work again
this.document = 'string';
document = 'string';
Document = 'string';
</script>For some strange reason it only affects the Applet when 'this.Document' is used. Why would Java be affected in this way in the first instance? Even setting the 'scriptable' parameter to false doesn’t help:
<param name="scriptable" value="false">Are there any other settings I am not aware of that could maybe prevent Java from loooking at the JavaScript?
EJP wrote:
Use another name.As I mentioned in my original post this is not easily done, I can edit the source code on my own site but the code still remains unchanged on the Mootools JavaScript Framework website.
Thanks -
Signed applets won't run @ web, only locally
Hey, all elitist java folk, here is one for you:
I have succeded in creating a signed, and an un-signed java applet - both run well locally. The signed applet, writes to a local file.
Both are merely proof of concept.
So, here is the deal:
I upload both to a webserver (one of those where you get 50Mb for free) via ftp (not ASCII, binary transfer), and only the unsigned will run in my browsers (Opera, FF, MSIE tested).
The signed one writes to the screen: "Could not instantiate."
I belive the problem lies in the HTML, which is very basic but still works locally. I don't have any clsid-thingy, is this nessecary? Where do I read about this?
HTML that (should) load the signed applet:
<html>
<applet code="localfile.class" archive="localfile.jar" width="300" height="300">
</applet>
</body>
</html>As previously said, the unsigned applet work both from the web and locally, so I won't post any more html here...
Btw, I am not interessed in editing any policy-file; my signed applet should work "out-of-the-box" for any java-enabled browser on the Internet.
All I want is for the browser to load the signed java applet, ask user for certificate confirmation, and run it... Just like with http://jupload.sourceforge.net/applet-basic.html , which also access local filesystem.If you open the Java Console what does it say?
There shouldn't be any difference in loading the applet locally or from the webserver... presuming the HTML and jar files and classnames and stuff are all correct relative to both locations. -
java applets will not load,
i have run the java test page & i have the latest version installed.
have removed all old versions of java from my hard drive & restarted the computer.
i have checked that java is enabled in the plug-ins and it is with version se 6 u22, also something called java development toolkit 6.0.220.4 np runtime script plug-in library for java (tm) deploy.
if i click on java console in tolls nothing happensHi,
You might want to look in your control panel for 'Java' icon. It should give you an option to enable java plugin into your browser. Let me know if you still face the issue.
Thanks! -
Java applet won't load from Jar file
Hi all,
I have a problem which I didn't used to have. I have written an applet which used certain classes stored in directories. It used to work just fine. I recently updated the main class from which the applet starts and since then I get error messages:
Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03-384-10M3425 Java HotSpot(TM) 64-Bit Server VM
User home directory = /Users/benoize
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
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>
load: class WiaRekenToolHC.class not found.
java.lang.ClassNotFoundException: WiaRekenToolHC.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:252)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:250)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:180)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:161)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:687)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3046)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1498)
at java.lang.Thread.run(Thread.java:680)
Exception: java.lang.ClassNotFoundException: WiaRekenToolHC.class
As you can see it says that it can't find the class WiaRekenToolHC, but it's there in the jar files.
Here is the link where you can see it:
www.creativemathsolutions.nl/demo/HC/demo.html
The jar files are in the directory HC and Generic.
If you need more info then let me know!
Regards, Benoit<applet
codebase="http://www.creativemathsolutions.nl/demo/HC"
code="WiaRekenToolHC.class"
ARCHIVE="HC/wia_hc_archive_v0_3.jar, Generic/wia_archive_v0_3.jar"
width=900 height=600>The code-base combined with archive href for the first Jar mean the JRE will look for it at:
http://www.creativemathsolutions.nl/demo/HC/HC/wia_hc_archive_v0_3.jar
It is not there. The other Jar is also missing from the stated location. -
Java Applets won't load in Netscape 4
Hello,
No java applets will load in Netscape 4. I checked to see if java plugins existed and they do I actually have about 4 different versions installed on my computer because I have been trying to resolve this issue. I looked in the browsers plugins directory it contains four java .dll files. Does anybody know whats going on? In internet explorer java applets load correctly.
Thank You,
MarkPerhaps it is due to your HTML code in the webpage? If you use the <APPLET> tag only, the applet may not run in all browser/platform. You can use HtmlConverter that comes with JDK/JRE 1.4 in order to generate HTML code which allows your applet to run in any browser/platform.
Hope it helps,
A.A.
Hello,
No java applets will load in Netscape 4. I checked to
see if java plugins existed and they do I actually
have about 4 different versions installed on my
computer because I have been trying to resolve this
issue. I looked in the browsers plugins directory it
contains four java .dll files. Does anybody know whats
going on? In internet explorer java applets load
correctly.
Thank You,
Mark -
Applet won't run on all platforms
I've written a simple applet that compiles cleanly (apparently), and
will run on Solaris and Red Hat 9 using appletviewer; and it will run
on a friend's WinXP Pro system. But when I try to run it on my WIn XP
Pro system, I get these messages in the appletviewer window:
error:null
then
Start: applet not initialized
and in the DOS box I call appletviewer from, I get a string of
messages :
at Panel.<init>(Panel.java:10)
I'm using J2SE 1.4.1 on my XP system.
Thanks for any help!
HarryOK, here's the code:
//CardDemo.java
// action handling with multiple events
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class CardDemo extends Applet implements ActionListener{
//Control panel components
Panel pnlControls = new Panel();
Button btnFirst = new Button("|<<");
Button btnPrev = new Button("<==");
Button btnC = new Button("C");
Button btnNext = new Button("==>");
Button btnLast = new Button(">>|");
//The Cards
Panel pnlCards = new Panel();
CardLayout Stack = new CardLayout();
Label lblA = new Label("A");
Label lblB = new Label("B");
Label lblC = new Label("C");
Label lblD = new Label("D");
Label lblE = new Label("E");
public void init(){
//set up the main page
this.setLayout(new BorderLayout());
this.add(pnlControls, BorderLayout.SOUTH);
this.add(pnlCards, BorderLayout.CENTER);
// set up the control panel
pnlControls.setFont(new Font("SanSerif",Font.BOLD, 20));
pnlControls.setLayout(new FlowLayout());
pnlControls.add(btnFirst);
pnlControls.add(btnPrev);
pnlControls.add(btnC);
pnlControls.add(btnNext);
pnlControls.add(btnLast);
// register the ActionListener
btnFirst.addActionListener(this);
btnPrev.addActionListener(this);
btnC.addActionListener(this);
btnNext.addActionListener(this);
btnLast.addActionListener(this);
//set up the card panel
pnlCards.setLayout(Stack);
pnlCards.setFont(new Font("SanSerif",Font.BOLD, 60));
pnlCards.add(lblA,"A");
pnlCards.add(lblB,"B");
pnlCards.add(lblC,"C");
pnlCards.add(lblD,"D");
pnlCards.add(lblE,"E");
//center the labels
lblA.setAlignment(Label.CENTER);
lblB.setAlignment(Label.CENTER);
lblC.setAlignment(Label.CENTER);
lblD.setAlignment(Label.CENTER);
lblE.setAlignment(Label.CENTER);
} // end init
public void actionPerformed(ActionEvent e){
//get the name of the button that was pressed
String theCommand = e.getActionCommand();
//check to see which button was pressed
if (theCommand.equals("|<<")){
Stack.first(pnlCards);
else if (theCommand.equals("<==")){
Stack.previous(pnlCards);
else if (theCommand.equals("C")){
Stack.show(pnlCards,"C");
else if (theCommand.equals("==>")){
Stack.next(pnlCards);
else if (theCommand.equals(">>|")){
Stack.last(pnlCards);
} // end if
} // end ActionPerformed
} // end class def
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