Solved

java.lang.NoClassDefFoundError?????

Posted on 1997-03-13
1
261 Views
Last Modified: 2008-03-06
I am trying to use a  Java Midi API from outside of Sun's API.  The API is called MidiShare and I am having a great deal of trouble getting it to work. Whenever I try to load a MidiShare applet I revieve this information......

AppAccelerator(tm) 1.0.2a for Java, x86 version.
>Copyright (c) 1996 Borland International. All Rights Reserved.
># Failed to pull over zip file
>http://www.grame.fr:80/Java_classes/MidiDisplay.zip
># Security Exception: link:JMidi
># Applet exception: error: java.lang.NoClassDefFoundError
>java.lang.NoClassDefFoundError
>  at grame.appletsmidi.MidiApplet.<init>(MidiApplet.java)
>  at grame.appletsmidi.MidiDisplayApplet.<init>(Compiled Code)
>  at netscape.applet.EmbeddedAppletFrame.run(Compiled Code)
>  at java.lang.Thread.run(Compiled Code)
># Applet exception: error: java.lang.NoClassDefFoundError
>java.lang.NoClassDefFoundError
>  at grame.appletsmidi.MidiApplet.<init>(MidiApplet.java)
>  at grame.appletsmidi.MiniKeyboardApplet.<init>(Compiled Code)
>  at netscape.applet.EmbeddedAppletFrame.run(Compiled Code)
>  at java.lang.Thread.run(Compiled Code)

The MidiShare API consists of three main parts.  A Player32.dll which is supposed to go into the windows system directory, two more dll's (JMidi.jll, Jplayer.jll) that go into the Netscape/program/java/bin folder, and a class folder called grame which goes directly into the Netscape/program/java/class directory.(I have done all this)
 
I am using the JDK1.1 and Nescape Nav gold 3.1 on a pentium system.  Can you please tell me what this message means and what I need to do to fix this problem.

Any help will be very much appreciated.
0
Comment
Question by:Mystosus
1 Comment
 

Accepted Solution

by:
amarshal earned 200 total points
ID: 1219003
You are trying to download native code as an applet, which is throwning a securtity exception (line 4).  Native interfaces, like your dll's, are not allowed in applets.  Allowing such would make Java as insecure as ActiveX.  In addition to being insecure, it makes the Java applet platform depended; it would not run on a Mac or Sun machine.

The NoClassDefError is a result of the security exception disallowing the classes/dlls to be loaded.

Unfortunately, since it is a security exception, there is no fix for this.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java asynchronous logging 4 50
bitbucket vs gitbucket 3 57
Strange loading of website behaviour 3 31
Spring Framework HTTPSession management 1 22
INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now