Configuring repositories in custom plugin

I am writing a custom plugin for our organization to automatically configure Gradle with our internal repositories. I hit a snag where a Gradle build using the plugin is complaining about “Cannot configure the ‘publishing’ extension after it has been accessed”. From what I have Googled, it looks like this could be caused by accessing the repositories with a ‘getRepositories()’ call. So instead I tried to use the project.repositories closure. What I can’t figure out is how to use this closure in Java.

I assumed it would be something like this:
project1.repositories( repositoryHandler -> repositoryHandler.mavenLocal() );

But it did not like that, it’s almost like the java closure doesn’t know what the type is. Does anyone have any suggestions on how to properly do this?


Edit: Removed some extra characters.