What are the migration paths between them?

I can only answer questions about crossoverjie/jcsprout or realm/realm-java.

Your question asks about "migration paths between them" — but crossoverjie/jcsprout and realm/realm-java are two separate, unrelated projects with different purposes:

• [crossoverjie/jcsprout] is an educational Java knowledge base covering core Java concepts (collections, concurrency, algorithms, JVM, design patterns).
• [realm/realm-java] is a mobile database library for Android/Java with schema management, sync, and ORM capabilities.

They don't have migration paths between them because they solve different problems and serve different domains. If you're asking:

• How to migrate data into Realm? — The realm/realm-java docs discuss JSON import patterns [realm-annotations/src/main/java/io/realm/annotations/RealmNamingPolicy.java:L81-L120].
• About the projects' relationship? — They're independent projects with no dependency on each other.
• Something else? — Please clarify your question.

FOLLOW_UPS:

• What is the purpose of each repository?
• How does Realm handle schema migrations?
• What educational topics does JCSprout cover?