using java applet in google app engine project - java

I have a question about using java applet on google app engine. I created 2 classes called InteractiveGraphView1 and SimpleApplet. Using an object of InteractiveGraphView1 inside SimpleApplet. Anyway, I'm using some external jars for these 2 classes. I created a jar for my project called "GraphApplet". Then I put this jar into WEB-INF/lib and also I add it into gae project as external jar. To be sure I also added external jars that I used in GraphApplet class into my gae project. I deployed the gae project and when I tried to run applet it gives me this error:
load: class SimpleApplet.class not found.
java.lang.ClassNotFoundException: SimpleApplet.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$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: SimpleApplet.class
java.lang.RuntimeException: java.lang.NoClassDefFoundError: edu/uci/ics/jung/algorithms/layout/Layout
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: edu/uci/ics/jung/algorithms/layout/Layout
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$12.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(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)
Caused by: java.lang.ClassNotFoundException: edu.uci.ics.jung.algorithms.layout.Layout
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)
... 20 more
Exception: java.lang.RuntimeException: java.lang.NoClassDefFoundError: edu/uci/ics/jung/algorithms/layout/Layout
What should I do?
P.S. I forgot to tell that I'm using JUNG library in my GraphApplet project. I also added this into google app engine project
Adding into HMTL
<html>
Hello App Engine
This is my page<br>
Below you see an applet<br>
<br>
<Applet Code="SimpleApplet.java" archive="graphic.jar" width=200 Height=200>
</Applet>

Applet is just a jar file that is downloaded by browser and executed on client side as applet.
It has nothing to do with server code. From the point of server it's just a static file. So you should not pout it inside WEB-INF/lib, where server libs reside. Just put it next to your html files.
For an applet referring to other jars see: How do I build an applet which needs an external jar, using ant?

Just put your applet.jar to root of WAR directory

Related

Unable to run two applications simultaniously in Java 6 and Java 8 using jnlp

We have two applications launched using Java Web Start (jnlp file) and each application supporting different java version. One application supports Java/JRE 1.6 (supports java 1.5 but not Java 1.7 or 1.8) and the other supports Java/JRE 1.8 (only).
When we try to launch both the applications on the same desktop using direct JNLP links e.g. <serveraddress>/deploymentfolder/abc.jnlp, looks like the JavaWS cache gets corrupt and the applications are not working as expected.
We tried several methods of launching the applications listed below. In all cases, we configure two different .bat files to launch each application using complete java path e.g.
C:\java\jre1.6\javaws http://serveraddress/deploymentfolder/app1.jnlp
and
C:\java\jre1.8\javaws http://serveraddress2/deploymentfolder/app2.jnlp
Methods
Install JRE 1.6 using Java installer, use a copy-only (no need to install) copy of Java 1.8.
Install JRE 1.8 and used a copy-only copy of JRE 1.6
Install both versions
Use copy-only version of both versions
Along with first four methods, we tried to configure different JavaWS cache folder for different version by specifying it in deployment.properties file.
We could not get both the application running successfully in any try. In application logs, we see exceptions suggesting the cache is corrupt (pasted below).
Can anyone please suggest any ideas on how we can get these two applications running?
java.lang.RuntimeException: ERROR: Failed to recover corrupt cache entry
at com.sun.deploy.cache.CacheEntry.recover(Unknown Source)
at com.sun.deploy.cache.CacheEntry.getCodeSourceCache(Unknown Source)
at com.sun.deploy.cache.CachedJarFile.getCodeSourceCache(Unknown Source)
at com.sun.deploy.cache.CachedJarFile.findMatchingSignerIndices(Unknown Source)
at com.sun.deploy.cache.CachedJarFile.entryNames(Unknown Source)
at com.sun.deploy.cache.DeployCacheJarAccessImpl.entryNames(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler.assertTrust(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler.access$700(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.check(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.access$1500(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler$ChildElement.checkResource(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.checkResource(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.getResource(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath.getResource(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 com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
....
....
at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
at java.awt.Window.processWindowEvent(Unknown Source)
at javax.swing.JFrame.processWindowEvent(Unknown Source)
at java.awt.Window.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(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)

Creating an executable .jar using Intellij

I've got an app which is using few external jars like mail-1.4 and etc. And now I want to execute my app out of IDE (IntelliJ). Also I was following instruction File>Project Structure>Artifacts and so on, but my command prompt says:
Exception in thread "main" java.lang.SecurityException: Invalid signature file
igest for Manifest main attributes
at sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)
at sun.security.util.SignatureFileVerifier.process(Unknown Source)
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.util.jar.JarFile.getInputStream(Unknown Source)
at sun.misc.URLClassPath$JarLoader$2.getInputStream(Unknown Source)
at sun.misc.Resource.cachedInputStream(Unknown Source)
at sun.misc.Resource.getByteBuffer(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
My MANIFEST is almost empty:
Manifest-Version: 1.0
Main-Class: ru.tenet.smsc.SMSC
What is wrong?
One of the jars you extracted to the target jar was signed. The easiest way to fix it is to select "copy to the output directory and link via manifest" in the "Create JAR from Modules" dialog

Java- Can't apply Java Look and Feel

I'm using Synthetica Look and Feel in my application and it works fine on Eclipse. But when i export the Jar file and execute it i got these errors :
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: sun/swing/plaf/synth/SynthUI
at de.javasoft.plaf.synthetica.SyntheticaDefaultLookup.getDefault(SyntheticaDefaultLookup.java:105)
at sun.swing.DefaultLookup.get(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.getInputMap(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.installKeyboardActions(Unknown Source)
at javax.swing.plaf.basic.BasicButtonUI.installKeyboardActions(Unknown Source)
at javax.swing.plaf.basic.BasicButtonUI.installUI(Unknown Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.AbstractButton.setUI(Unknown Source)
at javax.swing.JButton.updateUI(Unknown Source)
at javax.swing.AbstractButton.init(Unknown Source)
at javax.swing.JButton.<init>(Unknown Source)
at javax.swing.JButton.<init>(Unknown Source)
at de.javasoft.plaf.synthetica.SyntheticaLookAndFeel.installCompatibilityDefaults(SyntheticaLookAndFeel.java:925)
at de.javasoft.plaf.synthetica.SyntheticaLookAndFeel$4.propertyChange(SyntheticaLookAndFeel.java:582)
at java.beans.PropertyChangeSupport.fire(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at javax.swing.UIManager.setLookAndFeel(Unknown Source)
at com.evaluator.MainWindow.<init>(MainWindow.java:85)
at com.evaluator.Main$1.run(Main.java:15)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
Caused by: java.lang.ClassNotFoundException: sun.swing.plaf.synth.SynthUI
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 35 more
I don't know where is the problem exactly. Here is the way I'm applying the Synthetica Blue Steel Look And Feel :
try
{
UIManager.setLookAndFeel(new SyntheticaBlueSteelLookAndFeel());
UIManager.put("Synthetica.rootPane.titlePane.title.center", true);
UIManager.put("Synthetica.translucency4DisabledIcons.enabled", true);
}
catch (Exception e) {}
Please see the error it can't find the sun/swing/plaf/synth/SynthUI
Library. In development mode You are include that jar file in eclipse library but when you are create a jar file then you are not include the Synthui theme jar. Put that Synthui jar file in jar, ext/ folder and it work fine
I think the way you are exporting the jar file is not correct.
Try exporting the jar as a Runnable jar file.
Follow these steps to export your app as a runnable jar.
1) select export from the file menu.
2) select Java->Runnable JAR file
3) Select the launch configuration i.e your main class.
4) first two option of library handling if you want to package the substance library file in your own jar and the third option(copy required library into a sub folder next to the generated jar) if you want to separate the generated jar file and substance libs.
5)Press finish.
I hope this would solve your problem. :)

Java Web Start Error FileNotFoundException

So Im trying to use webstart on this application of mine and I keep getting this error:
java.io.FileNotFoundException:
http://www.fenixflame.net/DropLogger/Drop Logger.jar at
sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source) at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method) at
sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown
Source) at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown
Source) at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown
Source) at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown
Source) at com.sun.deploy.net.BasicHttpRequest.doGetRequest(Unknown
Source) at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown
Source) at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown
Source) at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown
Source) at
com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown
Source) at
com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown
Source) at com.sun.deploy.net.DownloadEngine.getResource(Unknown
Source) at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown
Source) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown
Source) at java.util.concurrent.FutureTask.run(Unknown Source) at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source) Caused by:
java.io.FileNotFoundException:
http://www.fenixflame.net/DropLogger/Drop Logger.jar at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown
Source) at java.net.HttpURLConnection.getResponseCode(Unknown Source)
... 15 more
This is my First time using webstart. I tested it out with simple applications and it worked just fine. I think it might have something to do with the fact that the application tries to read a local file when its launched.
Cannot post more than 2 links but you can check it out here:
fenixflame.net/DropLogger/launch.html
Yes problem was the space on the .jar file. I changed it and it worked just fine.
Its not possible to change the .jar file name inside netBeans, you can only change the project name but that doesnt change the file name. The only way to do change the .jar name is going to the project .xml file or creating a new project with the name you want for your jar file and copying all ur packages there.

Applet throwing exception when running it through web browser

I have written an applet program. It has some references to classes from java tools.jar in it (eg:- import com.sun.jdi.connect.IllegalConnectorArgumentsException)
When I run this applet through appletviewer utility it works fine. But when I embed this applet in HTML file and try to run it through web browser, I am getting exception about some classes not found at runtime:-
Java Plug-in 1.6.0_18
Using JRE version 1.6.0_18-b07 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Pras
java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/sun/jdi/connect/IllegalConnectorArgumentsException
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.NoClassDefFoundError: com/sun/jdi/connect/IllegalConnectorArgumentsException
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$12.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(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)
Caused by: java.lang.ClassNotFoundException: com.sun.jdi.connect.IllegalConnectorArgumentsException
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 14 more
Caused by: java.io.FileNotFoundException: C:\pal\WTP_Workspace\JavaSocketBridge\bin\com\sun\jdi\connect\IllegalConnectorArgumentsException.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.(Unknown Source)
at java.io.FileInputStream.(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)
... 17 more
Exception: java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/sun/jdi/connect/IllegalConnectorArgumentsException
However the IllegalConnectorArgumentsException class is part of java runtime located inside tools.jar.
How I can get run it inside browser as well?
many thanks in advance.
Regards,
Pras
You are running your applet from the JRE. The class IllegalConnectorArgumentsException can only be access from the JDK since it's related to debugging.
Refer to this question.

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