Eclipse Projectdependency on multiple src directories

today I have a special problem which already took me a while at the debugger. I have two projects Project A and Project B. Project A has multiple src-directories.

src
├───main
│   └───java
└───generated
    └───java

both are recognized by eclipse as actual src directories. Both will be compiled to bin which looks like this:

bin
├───main
└───generated

Project B has a Project-dependencie on Project A. And now comes the strange part: When I look for a class from Project A/src/main/java via Class.forName() inside Project B it will be found. When i look for a class from Project A/src/generated/java I get a ClassNotFound exception.

I would be very glad if you could point out a way to tell eclipse to create a dependencie on both src-directories.

btw, just in case it is important: I am using java 9. and here is an excerpt of .classpath from Project B

<classpathentry kind="src" path="/Project A"/>

Thanks for your help.

Solution

This looks like a bug of Eclipse, Gradle or a combination of both. Try to delete the run configuration and restart the application. Make also sure the gradle.build file is in sync with the Eclipse project. If all this doesn't help, you can use a single output folder as workaround:

Manually in Project > Properties: Java Build Path, in the tab Source:
1. Uncheck the checkbox Allow output folders for source folders
2. In the field Default output folder enter bin/main
or via following gradle.build snippet:

apply plugin: 'eclipse'
eclipse.classpath.file.whenMerged {
    entries.find { it.path == 'src/main/java' }.output = 'bin/main'
    entries.find { it.path == 'src/generated/java' }.output = 'bin/main'
}