NoClassDefFoundError in applet

Question

hi, my applet does compile and run I get the NoClassDefFoundError but it does run. When I move the .class to another folder, it doesn't run.
Here is what I get:
Java Plug-in 1.6.0_03
Using JRE version 1.6.0_03 Java HotSpot(TM) Client VM
User home directory = C:\Users\Gabo
java.lang.NoClassDefFoundError: SequencerSound
     at Stochastic1Applet.init(Stochastic1Applet.java:87)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)any idea on how to fix it?

Answer 1

Hi,
I had a similar problem. After moving the httml file one step down in the directory tree, the error is gone. However, I still have a problem to load the JDBC driver from Applet, but the same driver loads fine from JFrame.
appletviewer -J-Djava.security.policy=test.policy TestApplet.html
I have set following permission in test.policy file.
grant {
permission java.security.AllPermission;
Then, I get following error.
java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:168)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:119)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
I have loaded the driver as below.
try {
Class.forName("org.gjt.mm.mysql.Driver");
}catch(Exception e){e.printStackTrace();}
DriverManager.getConnection(url, username, password);
I am pretty sure that I have set the CLASSPATH variable correctly, otherwise it would NOT have worked from JFrame.
Does anybody out there know why it doesn't work from Applet although it works from Frame?
Thanks in advance.