GitLab

On Master run mvn clean compile which correctly finishes. This porduces the following output in the build folder.

VadereSimulator
│                   
├── target
│   ├── classes
│   │   ├── attribute.json
│   │   ├── attributeVersio_0.json
│   │   ├── current_commit_hash.txt
│   │   ├── DataProcessorFactory.java <-- generated source file should be in VadereSimulator/target/generated-sources/annotations
|   ├── maven-status
...

This is the reason for missing source files in Intellij because target/classes is not searched for source files.

possible solution

change version number from 1.11 to 11

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <auto-service.version>1.0-rc2</auto-service.version>
    <maven-compiler.version>3.6.1</maven-compiler.version>
    <maven-compiler.source.version>11</maven-compiler.source.version> <<<!!!!!!
    <maven-compiler.target.version>11</maven-compiler.target.version> <<<!!!!!!
  </properties>

compoare SO with link to here