"[SOLVED] RAPIDMINER and LINUX Installation"

emma

Hi all,

I tried installing Rapidminer on my Linux OS(Red HAT). I have already used Rapidminer in windows.
According to the installation instructions I upgraded my java version from 1.4.2 to 1.5.0_09 . The next part was to simply unzip the files and type in java -jar rapidminer.jar  in the installed directory.However this doesnt seem to work and i have been getting the following error,

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
       at java.lang.ClassLoader.defineClass1(Native Method)
       at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
       at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
       at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

It looks like it has  a problem with the java version but i downloaded it from the sun website  . So if anyone has a solution/suggestions please let me know.

Thanks,
Emma

IngoRM

Hi,

It looks like it has  a problem with the java version but i downloaded it from the sun website  . So if anyone has a solution/suggestions please let me know.

This is indeed a problem with a wrong Java version. We unfortunately used Java 6 for packaging the latest 4.2 release (although only Java 5 is necessary, we use Java 6 for other projects and accidentally also used Java 6 for the RM 4.2 release). This was pointed out in this thread:

http://rapid-i.com/rapidforum/index.php/topic,183.0.html

So simply installing and using Java 6 should solve the problem.

Cheers,
Ingo