"java.home" does not work on macOS with one than one JDK installed

Issue Type: Bug

Setup 'java.home' does not work in neither workspace's settings.json nor user's settings.json. I have two JDK installed on my laptop. In settings.json, I point 'java.home' to my JDK 11 folder. However, VS Code always use my JDK 8 for compile/build/run/debug. Only after I deleted JDK 8, VS Code begin to use my JDK 11.

I noticed that even I don't setup 'java.home', VS Code can still auto-detect my installed JDK and use it.

I don't have JAVA_HOME setup in my environment variables.

VS Code version: 1.43.1
macOS version: 10.13.6

Extension version: 0.8.1
VS Code version: Code 1.43.1 (fe22a9645b44368865c0ba92e2fb881ff1afce94, 2020-03-18T07:01:41.240Z)
OS version: Darwin x64 17.7.0