Java library Language - Martin Baker

Java Applet Troubleshoot

If the program is not displayed first check the following,

Check that Java Code is enabled in your browser.
Check that you have at least java 1.3 or later installed on your computer.

When I was trying the applet on a Linux system running jvm1.4 I just got a box with a red 'x' in it. Right clicking on it and opening the java console gave:

Java(TM) Plug-in: Version 1.4.2_10 Using JRE version 1.4.2_10 Java HotSpot(TM) Client VM User home directory = /home/martin
Proxy Configuration: Browser Proxy Configuration
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache 0-5: set trace level to <n>
----------------------------------------------------
java.lang.UnsupportedClassVersionError: ThreeDTransform/ThreeDImageTransformApplet (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:157)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:123)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:561)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:619)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1880)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:548)
at sun.applet.AppletPanel.run(AppletPanel.java:299)
at java.lang.Thread.run(Thread.java:534)

Problem Solving

If a problem is difficult, don't panic, try these ideas:

Find a similar problem. Can you apply to your own problem?
Simplify the issue by removing some variables or dimensions.
When one approach fails, try the opposite.
Dream: fantasies about a situation such as assuming that all restrictions have been removed.
Establish sub-goals: break the problem into a number of smaller ones.
List the assumptions you have made about solving the problem and challenge them.
Try working through the situation from the way things are to the way you want them to be.
Choose other words to describe the problem. An alternative definition can yield new possibilities.

There are more ideas on This page.

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see also:

Correspondence about this page

Book Shop - Further reading.

Where I can, I have put links to Amazon for books that are relevant to the subject, click on the appropriate country flag to get more details of the book or to buy it from them.

Java - How To Program. This is a very comprehensive book, starting at the beginning and going through to advanced java capabilities. It covers Java 6.0, software is included on CD and the book is in colour.

Other Java books

Commercial Software Shop

Where I can, I have put links to Amazon for commercial software, not directly related to this site, but related to the subject being discussed, click on the appropriate country flag to get more details of the software or to buy it from them.

SuSE Linux 11.0. Operating system with a wide range of applications including Open Office. A good distribution for developers as it contains KDevelop. Java, Mono, etc. Can install itself as a dual-boot system with an existing Windows OS if required. For information about installing it see this page.

Can this page be improved?

Please send me any improvements to here. I would appreciate ideas to make the pages more useful including error correction, ideas for new pages, improvements to wording. It helps if you quote the full URL of the page.

progam

I am working on a project which uses these principles, if you would like to help me with this you are welcome to join in, here:

for xml encoding: http://sourceforge.net/projects/xes/

This site may have errors. Don't use for critical systems.