DevOps, CI/CD and Automation

i know C# and am trying to learn java.

my environemnt is windows xp professional
downloaded and installed J2SE development kit 5.0 update 7 with netbeans ide 5.0 bundle.

at command i tried to make the hello world app.
using javac compiler.
i have set the path to the compiler.

but, i get this error:
Error occured during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

it seems like i need to get the virtual machine going somehow.
but, nothing in regards to this in the tutorial.

if you can help me please do, else i may have to forget about learning java.