My applet is not being seen in its jar anymore. Please help!

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posted 14 years ago

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Hello!

I have been trying to make this example work (example link). And I had succeded at a moment. This is an applet, SWTInBrowser, that should show three buttons: one awt, one Swing and one SWT.
If I just run it with the Applet Viewer, I get all the three buttons, because the program knows where to find the external library. Then I put the applet in a jar, created an HTML file and ran it in FireFox and IE and I only got the AWT button and Swing button, because the swt.jar is external and I received the access denied error.
Then I followed step by step what the author of the article in the link sugested, but it didn't work. I tried to come back to what I had before, but now it doesn't wprk anymore, I keep getting the fileNotFound error, he can't see the applet in the jar.
Here is the HTML file, which is in the same folder with the applet's jar.

I have no idea what to do next. Can you please help me?

Paul Clapham

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posted 14 years ago

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In your browser, make sure that both the following links return a file:

http://yourhost/MyApplet.jar

http://yourhost/org.eclipse.swt.win32.win32.x86_3.4.1.v3452b.jar

If you get a "404 Not Found" error for the second one, then you didn't put it in the right place for your web server to respond to requests for it.

Java 8 (verified skill)
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Alexandra Niculai

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posted 14 years ago

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When I put in the browser the jars' addresses, I get the option of downloading the file or opening the file. Is that OK?

Ulf Dittmer

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posted 14 years ago

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Are there any error messages in the Java Console?

Alexandra Niculai

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Yes, but I don't get the same error all the time, even if the application stays the same(I don't understand that either).

java.lang.ClassNotFoundException: my.applet.SWTInBrowser
	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.io.FileNotFoundException: D:\Applets\my\applet\SWTInBrowser.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)
	... 7 more
Exception : java.lang.ClassNotFoundException: my.applet.SWTInBrowser

Or, this error:

java.lang.SecurityException: cannot verify signature block file META-INF/ECLIPSE
	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.JarIndex.getJarIndex(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 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.SecurityException: cannot verify signature block file META-INF/ECLIPSE
charger : classe my.applet.SWTInBrowser introuvable.