Bugfix HeadlessServer: Multiple inheritance for GraphQL types overwrites fetch expression by last type

HeadlessServer overwrote the fetch expression when a GraphQL type used the @inherit directive with two or more types, which also implemented GraphQL interfaces. The problem was fixed.

(CMS-27168)

Apollo Federation Support

HeadlessServer now comes with Apollo Federation Support for GraphQL. To enable Federation Support, simply add the library com.apollographql.federation:federation-graphql-java-support:5.0.0 to your maven dependencies with scope runtime:

<dependency>
  <groupId>com.apollographql.federation</groupId>
  <artifactId>federation-graphql-java-support</artifactId>
  <scope>runtime</scope>
</dependency>

During server start, the library will be detected and federation support will be enabled. The log will show an additional info level message, that federation support is active.

(CMS-27128)