The problem is that solver configuration changes between versions. There's a need to create multiple versions of examples in https://github.com/guvnorngtestuser1/optaplanner-playground (for 6.x & 7.x series).

2 basic options:

• Create separate repositories for 6.x & 7.x
• Use "Import example" wizard where a specific module can be imported. This way, we'll be fine with just one repository with multiple modules (1 per every version), however auto-import feature won't work anymore.