Java LRU Cache Implementation

I want a clean, well-documented Java class that behaves as an in-memory cache for up to 500 String entries. Once the cache reaches that capacity, the least recently used element must be evicted automatically so that the size never exceeds 500... (Budget: £250 - £750 GBP, Jobs: Java, JavaScript, JUnit, REST API, Software Architecture, Software Development, Software Testing, Spring Boot)