给定的Eclipse项目使用哪个JDK / JRE？

Question

I have a current version of Eclipse (4.5.2) and I've got several JDKs and JREs installed. How do I determine which specific JDK/JRE a given project is using?

The reason I ask is that I'm trying to figure out which logging.properties file to edit to make my logging work the way I want it.

I used -version as a VM argument in my project and it told me: java version "1.8.0_74" Java(TM) SE Runtime Environment (build 1.8.0_74-b02) Java HotSpot(TM) 64-Bit Server VM (build 25.74-b02, mixed mode)

Unfortunately, I have both a JDK and a JRE at that level so I'm not sure which one it is using in this project. Can anyone enlighten me?

The JRE system library in my project says [Java1.8SE] in Package Explorer but the individual jars in that library all look like this: rt.jar C:\\Program Files\\Java\\jre7\\lib which suggests that I have a 1.7 jre.

Can anyone shed some light on this?

Answer 1

Create a new class with a new main . Your program will then print your version.

System.out.println(System.getProperty("java.version"));

You can also do this by right-clicking on the JRE System Library at the bottom of the project and then clicking 'Configure Build Path' under 'Build Path'. Then look at 'Libraries'. This tells you what your JRE System Library is.