sir
i have a problem with java

my configuration is ubuntu 1.6

I wrote the sample java program

it prints just "Welcome to Java".

i compiled the program
$javac sample.java

it successfully compiled

when i run the program

$java sample

it will show the following error

java.lang.UnsupportedClassVersionError
at java.lang.VMClassLoader.nativeDefineClass (VMClassLoader.java)
at java.lang.VMClassLoader.defineClass (VMClassLoader.java:96)
at java.lang.ClassLoader.defineClass (ClassLoader.java:672)
at java.security.SecureClassLoader.defineClass (SecureClassLoader.java:8
at java.net.URLClassLoader.findClass (URLClassLoader.java:833)
at java.lang.ClassLoader.loadClass (ClassLoader.java:359)
at java.lang.ClassLoader$1.loadClass (ClassLoader.java:1282)
at java.lang.ClassLoader.loadClass (ClassLoader.java:303)
at java.lang.VirtualMachine.main (VirtualMachine.java:83)


how to fix this problem

Make sure that the version of java that you compiled your source with is the same version of VM that you are trying to run it with.

You may need to updgrade your JVM to match the JDK version that you are using.

From http://ubuntuguide.org