In eclipse, ./gradlew is generating JavaSE-1.8 instead of using my jdk1.8.0_73. What jdk is this because I discovered lately that it seems like it is 'not' my jdk1.8.073 for the following reason.....
I installed alpn.jar from jetty in jre/classes (I unzipped the classes there since the sun.boot.class.path says that directory is in the bootclasspath AND then I don't have add -Xbootclasspath to every tool in the world on my computer).
When I ./gradlew eclipse, my projects using this jar break and then when I remove JavaSE-1.8, and then re-add jdk1.8.0_73, all is fine and it compiles in eclipse and intellisense works and everything.
Soooooo, what is JavaSE-8 and how to remove it so when ./gradlew eclipse runs, it uses whatever default my eclipse is pointing to which in my case is jdk1.8.0_73.
One last question, why is JavaSE-1.8 not even listed on Installed JREs?
This is all quite confusing.
If you know there to find the "Installed JREs" in the Eclipse Preferences, just expand the "Installed JREs" node and select "Execution Environments", and things should become clear.
See https://wiki.eclipse.org/Execution_Environments for details of what they are.
Execution environments (EEs) are symbolic representations of JREs. For example, rather than talking about a specific JRE, with a specific name at a specific location on your disk, you can talk about the J2SE-1.4 execution environment. The system can then be configured to use a specific JRE to implement that execution environment.
Obviously that text was written some time ago, but your JavaSE-1.8 execution environment should automatically map to a Java 8 installed JRE. If you have more than one Java 8 installed JRE, you can choose which you prefer.