Unsupported class version error

I'm trying to run the "Hello World" example in the "Integrating Native Code Into Java" tutorial. When I try to run the program, this is the error message I get:
java MainException in thread "main" java.lang.UnsupportedClassVersionError: Main (Unsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Any idea what I might be doing wrong? I'm on a SUSE Linux box.
thanks
David

Here's an update:
I was invoking the wrong Java runtime before. Now that I have the correct one, here's the error message I get:
java Main
Exception in thread "main" java.lang.UnsatisfiedLinkError: no hello in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1709)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1028)
at HelloWorld.<clinit>(HW.java:7)
at Main.main(Main.java:5)
I have a "hello" C program in the same directory as Main.class, named libhello.so
Do I need to set java.library.path some way?
thanks
David

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