Java, fatal exception.

Energize · 8 Apr 2008 at 17:24

Dfhaii said:
Does netbeans know where this main class is, it's a property of the project which it'll need to populate the manifest correctly when packaging it up into a jar.

When you run it from netbeans are you running the project or running the file?

Running the file works fine, but the project won't run.

Dfhaii · 8 Apr 2008 at 17:29

In the projects window (Window->projects) you need to right click on whichever it is, choose properties from that pop up menu, go to the run section of the window that comes up there and set your main class. You should then be able to clean and build your project to get a runnable jar, and the project should run too

Energize · 8 Apr 2008 at 18:31

Now I can run the project in netbeans, but I get the error "Could not find main class", when trying to run the jar file.

Energize · 8 Apr 2008 at 21:22

And If I try to open it from the cmd prompt I get,

"Exception in thread "main" java.lang.NoClassDefFoundError: org/jdesktop/layout/GroupLayout$Group

Caused by: java.lang.ClassNotFoundException: org.jdesktop.layout.GroupLayout$Group

at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)"

RobH · 8 Apr 2008 at 21:33

That looks like your Java Runtime Environment (JRE) is not the correct version to run your program, the netbeans GUI builder uses features of Java 1.6 including GroupLayout which is what it's complaining about. Make sure that your runtime environmentis version 1.6 (Java 6) and that the paths are pointing to the 1.6 version and not the 1.5 or lower.

Energize · 8 Apr 2008 at 21:45

I have 1.6.0_3 and 1.6.0_4 installed. I get the same error when I tell it to use the java.exe 1.6.0_4 program to open the file.

RobH · 8 Apr 2008 at 21:50

I thought my suggestion might work because I had the same problem with GroupLayout before but it's something different in your situation, I'm sure we can find a solution though.

I found this if it is any use: http://wiki.netbeans.org/FaqDeployingMatisseBasedProjects

Energize · 8 Apr 2008 at 22:23

Thank you so much, I have finally done it using that link to pack the swing-layout into my jar file by editing the build.xml file.