Almost every piece of software installed these days seems to have some java version included with it. So sometimes when you are trying to run an application you could potentially be running the wrong java version based on the paths that are looked up for the java executable.

In windows from the command prompt you can issue the command:

where java

In Linux you can issue the command:

which java

The windows command will show you all the locations where it finds java, which from my tests it is sequenced from the first location it will find it to the last location it will find it.