Java language support for embedded Gradle plugin

I have a Gradle project with an embedded plugin in buildSrc that has Java code in buildSrc/srcmain/my/package/Foo.java. When I open these Java files, a "Foo.java isn't on the classpath" notification pops up and things like Oragnize Imports and javadoc hovers don't work.

It would be awesome if vscode-java would recognize buildSrc in a Gradle project so language support would work in plugin source code.

Environment

• Operating System: macOS 10.12
• JDK version: 1.8.0_171
• Visual Studio Code version: 1.37.0-insider
• Java extension version: 0.46.0

Steps To Reproduce

1. Create a Gradle project and open it in vscode
2. Add Java source files to buildSrc/package/Foo.java
3. Open the Java source files

Current Result

No language support available

Expected Result

Working language support