Installing JAVA for octave

[kees]

To use the "io package" I had to install Java aswell. I downloaded the 
package from the SourceForge.net and tried to install it like I did with 
all the other packages  " pkg install java-1.2.9.tar.gz. etc

However, I received an error and I had to do something with 
"setenv("JAVA_HOME", "full/path/to /JavaJDK") and that is what I not 
really understand what I have to do here. I executed it and of course I 
used the correct path but it did not work. It appears that it has to be 
installed somewhere specific but I do not know where and how.

So does anyone knows how to do this correctly?

Kees