Design a Java learning plan for 2026.

My programming experience: {{experience}}
My goal: {{goal}} (Spring backend, Android, learning OOP, job market)
Daily time: {{daily_time}}

Return:
1. Modern Java (21 LTS): records, sealed classes, pattern matching, switch expressions, virtual threads
2. The OOP fundamentals Java enforces and the patterns that emerge
3. Collections framework — what to actually use day-to-day
4. Streams and functional patterns in modern Java
5. The build tools (Maven vs Gradle) — practical guidance
6. Spring Boot fundamentals (if backend is the goal)
7. JPA / Hibernate the right way (and the common traps)
8. Testing with JUnit 5 and Mockito
9. 2 real projects
10. The Java mistakes from older codebases that you should NOT learn
11. Where Java actually shines vs. where to use something else