Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

java.lang.NoClassDefFoundError?????

Posted on 1997-03-13
1
Medium Priority
?
300 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 400 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

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
The viewer will learn how to implement Singleton Design Pattern in Java.
Suggested Courses
Course of the Month13 days, 19 hours left to enroll

581 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