Changing version of Java

Hi,

I just got Openfire working (latest version 4.0.3) on Server 2012 R2 .  I installed the latest Java from Oracle 8 u102 and I used the Openfire installer that contains the JRE. So I have a few questions:

1. How can I verify which Java I am using?

2. Java often has vulnerabilities, so if I reinstall Java how can I tell Openfire the path to a new Java?

I was not sure how to use the zip version so that's why I used the EXE. I essentially want Openfire to ONLY use the Java I installed and I want to delete

the packaged one.

Thanks in advance.

...Alan