What methods exist for checking cache contents during an error in a service?

There are several approaches to check cache contents when an error occurs in a service:

1. Logging cache contents — during debugging, you can add output of current cache values to logs to understand what exactly is stored in the cache at the moment of the error.

2. Using monitoring tools — if a cache with JMX support is used (e.g., Ehcache, Caffeine), you can connect to the MBean and view cache contents and statistics.

3. Programmatic access to cache — in the service code, you can access the cache object and call methods to get current keys and values, for example:

Cache<String, Object> cache = cacheManager.getCache("myCache");
Object value = cache.get("key");

4. Testing and debugging — write separate tests that check the cache state after certain operations.

5. Using special tools and plugins — for example, Spring Boot Actuator has endpoints for cache monitoring.

These methods help identify discrepancies in cache data that may lead to errors in the service operation.