Applets - java.lang.NoClassDefFoundError

[jim canniff]

Hi all,

I'm just getting started with JFreeChart and was able to compile and run the PieChart demo after adding the JCommon.jar, JFreeChart.jar and the "." to my CLASSPATH.

However, I can't get any applets to run properly. I'm getting all "java.lang.NoClassDefFoundError" messages when I try to run them. Mostly the message says the class can't find itself (wrong name?) or sometimes it's a class file from one of the jar files (I'm assuming). Anyway, they compile fine but I get the same error whether I reference and try to run them in a browser or if I just run it through an IDE's Applet Viewer (i'm using JBuilder and TextPad).

Anyway, if there is something else I need to add to the Path or CLASSPATH, or anything else I need to do, please advise.

Thanks very much,
Jim

[David Gilbert]

There is an applet demo online at:

http://www.object-refinery.com/jfreechart/applet.html

Does that run for you? If so, take a look at the applet tag in the underlying HTML to see how I specified the classpath. I've used three jar files, one containing the applet plus the JFreeChart and JCommon jar files.

Regards,

Dave Gilbert

[jim canniff]

Still getting the same problem for Applet1:
java.lang.NoClassDefFoundError: com/jrefinery/data/TimePeriod

Again, it compiles fine but when I try to include it and run it in a browser (or IDE Applet Viewer), I get the above error. I included it in a jar file this time but it made no difference. Here's the html code:
<APPLET
ARCHIVE="jfreechart-0.9.4-premium- demo.jar,jfreechart-0.9.4.jar,jcommon-0.7.1.jar"
CODE="Applet1"
CODEBASE="com\jrefinery\chart\demo\premium"
width="640" height="260"
ALT="You should see an applet, not this text.">
</APPLET>

The premium jar file contains only the Applet1.class compiled from your source code. By the way, MemoryUsage works fine on my machine as an application.

Thanks for the help,
Jim

[jim canniff]

I made some progress but still have not gotten the Applet1 applet to work.

Here's what I did:
To test that I was referencing things properly I made a very simple HelloWorld type swing applet (TestApplet). Then added that to the jfreechart-0.9.4-demo.jar file. Then referencing it with this code in the html I got it to work:
<APPLET
CODE="TestApplet"
CODEBASE="com/jrefinery/chart/demo"
ARCHIVE="jfreechart-0.9.4-demo.jar,jfreechart-0.9.4.jar,jcommon-0.7.1.jar"
width="640" height="260"
ALT="You should see an applet, not this text.">
</APPLET>

So based on this success (albeit small) I moved the Applet1.java file to the com/jrefinery/chart/demo folder, compiled it and added the resulting Applet1.class and Applet1$DataGenerator.class to the jfreechart-0.9.4-demo.jar file. Then I referenced it in the html like this:
<APPLET
CODE="Applet1"
CODEBASE="com/jrefinery/chart/demo"
ARCHIVE="jfreechart-0.9.4-demo.jar,jfreechart-0.9.4.jar,jcommon-0.7.1.jar"
width="640" height="260"
ALT="You should see an applet, not this text.">
</APPLET>

Figuring it's in the same location as the TestApplet (above), it should have displayed but no, I still get the following error:
java.lang.NoClassDefFoundError: Applet1 (wrong name: com/jrefinery/chart/demo/Applet1)

So, any idea what I am doing wrong? Do I need to do something special with the Applet1$DataGenerator.class? I'm perplexed. Thanks for your help.

-Jim