eclipse compiler vs Installed JREs option

Hi,

what is difference between eclipse compiler vs Installed JREs options under ecipse -->windows--->preferences.

can you give jdk1.8 at both places? or can i give one place jdk 1.6 and other place jdk1.8.
Do i need to give only jre under installed jre and jdk under compiler drop down of eclipse?
How MyComputer--> advanced Variables JAVA_HOME and PATH and M2_HOMe are different?

why it shows different java version to me as below from java -version and mvn --version??

C:\>java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

C:\>mvn --version
Apache Maven 2.2.1 (r801777; 2009-08-06 15:16:01-0400)
Java version: 1.6.0_45
Java home: C:\Program Files\Java\jdk1.6.0_45\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7" version: "6.1" arch: "amd64" Family: "windows"
C:\>



please advise
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gudii9Asked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
There is no difference. Path settings determine what you see. Windows has path settings, so does eclipse.
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gudii9Author Commented:
but selecting JDK1.8 from JRE1.8 from ecipse -->windows--->preferences-->installed JREs  is seemingly solving some issues which i do not remember. I wonder how jdk not jre  helping better?
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Gerwin Jansen, EE MVETopic Advisor Commented:
JDK is what you normally use to build software, hence Java Development Kit. JRE is the runtime. If you can't remember what has been solved then this is as much as I can advise you with now.
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