How-to Enable Eclipse Java 8 Support
The Only Available Eclipse IDE with Java 8 Support is the Latest Eclipse Neon Luna
So to Develop with Java 8 on the Eclipse IDE You will Need to Install the Latest Eclipse Neon.
Then to Develop on the Eclipse IDE with the JDK8 we Need to Enable the Java 8 Support for Eclipse Neon.
On Workbench Click on Help >> Install New Software
Click on the Add… Button
SetUp Eclipse Neon Java 8 Support Sources Repo
Click on Next to Start Java 8 Support Installation
Click on Next
Click on Finish
Confirm for Unsigned Content Installation
Restart Eclipse to Load New SetUp
How-to Install Latest Eclipse on Linux:
Java 8 Early Release Documentation