UnsupportedClassVersionError

[Nikos Stavros]

I added a JradioButtonMenuItem to my program and when I run it in a different computer I get this

   java.lang.UnsupportedClassVersionError: Cairn_Image_Splitter (Unsupported major.minor version 49.0) 
 at java.lang.ClassLoader.defineClass0(Native Method) 
 at java.lang.ClassLoader.defineClass(Unknown Source) 
 at java.lang.ClassLoader.defineClass(Unknown Source) 
 at ij.io.PluginClassLoader.loadClass(PluginClassLoader.java:234) 
 at ij.io.PluginClassLoader.loadClass(PluginClassLoader.java:199) 
 at ij.IJ.runUserPlugIn(IJ.java:271) 
 at ij.IJ.runPlugIn(IJ.java:117) 
 at ij.Executer.runPlugIn(Executer.java:171) 
 at ij.Executer.runCommand(Executer.java:133) 
 at ij.Executer.run(Executer.java:63) 
 at java.lang.Thread.run(Unknown Source) 
 

can someone explain what exactly is going on here and what I can do about it

[Ernest Friedman-Hill]

You compiled the program with javac from JDK 1.5, and then tried to run it on another computer with an earlier version of Java. The other computer needs to be upgraded to Java 5.

[Andrew Monkhouse]

Alternatively, if you have not used any JDK 5 features, you could recompile your classes with the -target <release> javac flag, specifying the version of the JDK runtime on the computer you wish to use as your final destination.

Regards, Andrew