Bad version number on Mac, but not PC

Question

I have a java applet that works fine in Windows. It works fine on Macs as long as I compile it with JDK 1.5. However, once I compile it with JDK 1.6 it loads in Windows, but it doesn't load at all in Mac OSX. I've tried compiling it with javac using -target 1.5 -source 1.5 and -target 1.4 -source 1.4 but no luck.
None of the computers I have tested on have JRE version lower than 1.5. The Mac I tested it on has JRE 1.5.16. I've also tested it on Ubuntu with JRE 1.5, which didn't work, and 1.6, which did work.
Here is the error from appletviewer in Mac:
appletviewer testprogram2.html
2008-10-16 16:17:22.269 appletviewer[436:10b] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
2008-10-16 16:17:22.546 appletviewer[436:e13] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
2008-10-16 16:17:22.812 appletviewer[436:613] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
Warning: Can't read AppletViewer properties file: /Users/miahx/.hotjava/properties Using defaults.
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:675)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:177)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:119)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:605)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:723)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:652)
at sun.applet.AppletPanel.run(AppletPanel.java:326)
at java.lang.Thread.run(Thread.java:613)
It looks like there is still a version compatibility problem, but from researching this error, just adding the -target and -source java versions when compiling should fix it. Maybe I'm going about this all wrong?
Any ideas?
Edited by: nikkorizz on Oct 16, 2008 2:23 PM
Edited by: nikkorizz on Oct 16, 2008 2:52 PM

Answer 1

The above workarounds don't work for me on Windows, the only thing that has worked for me is to set the prefs to tabbed whilst the script is running.
function tabInterface(onOff) {
if(onOff == undefined) onOff=true;
    var desc19 = new ActionDescriptor();
        var ref8 = new ActionReference();
        ref8.putProperty( charIDToTypeID('Prpr'), stringIDToTypeID('interfacePrefs') );
        ref8.putEnumerated( charIDToTypeID('capp'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
    desc19.putReference( charIDToTypeID('null'), ref8 );
        var desc20 = new ActionDescriptor();
        desc20.putBoolean( charIDToTypeID('EGst'), true );
        desc20.putBoolean( stringIDToTypeID('openNewDocsAsTabs'), onOff );
    desc19.putObject( charIDToTypeID('T   '), stringIDToTypeID('interfacePrefs'), desc20 );
    executeAction( charIDToTypeID('setd'), desc19, DialogModes.NO );
function isTabInterface(){
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("capp"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
return executeActionGet(ref).getObjectValue(stringIDToTypeID('interfacePrefs')).getBoolean(stringIDToTypeID( 'openNewDocsAsTabs'));