Multiple Class Applet

Question

lllllIllIlllI 178 Veteran Poster

15 Years Ago

Hi
I have a sorting applet that implements Bubble Sort and Insertion sort, and i have a couple of classes in my program. I made it using netbeans and i have no main class, and when i run it using this code:

<html>
<applet code=Sorter.class
        width=800 height=300>
</applet>
</html>

I get the following

java.lang.NoClassDefFoundError: Sorter (wrong name: sort2/Sorter)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(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: Sorter (wrong name: sort2/Sorter)

It is in a package called sort2 in netbeans, i just wondered whats going wrong.

Cheers
Paul

java

3 Contributors
8 Replies
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Latest Post 15 Years Ago Latest Post by lllllIllIlllI

Intrade 33 Junior Poster

15 Years Ago

I think you need to add a CODE BASE parameter with a value that specifies where your .class file is located.

Without it, I don't think the AppletViewer can locate your .class file. I don't know enough about the JDK to verify this, but I do recall having a similar problem after trying to make an Applet run on a different server.

Ezzaral 2,714 Posting Sage

15 Years Ago

If Main.class is declared in a package named "sort2" and in a folder of that same name, then from the root directory (the one containing the sorts directory), you invoke the class as "sort2.Main". The package is part of locating the class.
This tutorial may be helpful: http://java.sun.com/docs/books/tutorial/java/package/index.html

lllllIllIlllI commented: Couldnt have been a better post +2

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lllllIllIlllI 178 Veteran Poster · Answer 1 · 2009-03-22T14:44:28+00:00

So now my file looks like this:

<html>
<applet code="Sorter"
        width="800" height="300"
        CODEBASE="C:\Documents and 

Settings\Paul\My 

Documents\NetBeansProjects\Sort2\build

\classes\Sort2\">
</applet>
</html>

But i still get this error

oad: class Sorter not found.
java.lang.ClassNotFoundException: Sorter
	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: C:\Documents and Settings\Paul\My Documents\NetBeansProjects\Sort2\build\classes\sort2\Sorter.class (The system cannot find the file 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: Sorter

I am so confused right now, it works fine in the netbeans applet viewer

Ezzaral 2,714 Posting Sage Team Colleague Featured Poster · Answer 2 · 2009-03-23T23:33:17+00:00

Try it with your code base one level higher, like this

<html>
<applet code="Sorter"
        width="800" height="300"
        [B]CODEBASE="C:\Documents and Settings\Paul\My Documents\NetBeansProjects\Sort2\build\classes">[/B]
</applet>
</html>

It looks like you had the package directory in the previous code base.

lllllIllIlllI 178 Veteran Poster · Answer 3 · 2009-03-24T12:27:12+00:00

Yeah now i get this:

load: class Main not found.
java.lang.ClassNotFoundException: Main
	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: C:\Documents and Settings\Paul\My Documents\NetBeansProjects\Sort2\build\classes\Main.class (The system cannot find the file 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: Main

But when i put the html file in the same directory as the classes then i get this error

java.lang.NoClassDefFoundError: Main (wrong name: sort2/Main)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(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: Main (wrong name: sort2/Main)

Oh and by the way i renamed the class main, and refactored it so it is still all working in netbeans.

lllllIllIlllI 178 Veteran Poster · Answer 4 · 2009-03-28T01:53:16+00:00

Just wondering, if no-one can solve this where should i go for help? Is there a specific java forum somewhere on the web that would be able to help me with this?

Ezzaral 2,714 Posting Sage Team Colleague Featured Poster · Answer 5 · 2009-03-28T01:59:15+00:00

Is your Main class in a folder called "sort2" and does it have a "package sort2;" declaration?

lllllIllIlllI 178 Veteran Poster · Answer 6 · 2009-03-28T02:14:06+00:00

WWOOOOOO!!! Thankyou! That is perfect!

<APPLET codebase="classes" code="sort2/Main.class" width=800 height=300></APPLET>

That is the code that worked in the end. Gosh, i am so happy now. Thanks for all your help Ezzaral.