To clear the cache and remove all cached entries, make a POST request to /actuator/cache with a JSON body as in the following example:

curl -X POST -H "Content-Type: application/json" \
     -d '{"clear": true}' \
     http://localhost:8081/actuator/cache

The response includes a message stating that the cache was cleared, and the state of the cache afterwards, as it would be returned by a GET request to the same URL. The following example just shows the start of the response body:

Response. 

{
  "message": "Cache cleared",
  "result": {
    "cacheClasses": {
      "ALWAYS_STAY_IN_CACHE": {
        "capacity": 9223372036854775807,
        "level": 0,
        "href": "http://localhost:8081/actuator/cache/ALWAYS_STAY_IN_CACHE"
      },
...

To clear the cache for a single cache class only, a similar POST request can be made to /actuator/cache/<cacheClass> as in the following example:

curl -X POST -H "Content-Type: application/json" \
     -d '{"clear": true}' \
     http://localhost:8081/actuator/cache/java.lang.Object

Again, the response includes a message about the operation and the state of the cache class afterwards:

Response. 

{
  "message": "Cache cleared for cache class 'java.lang.Object'.",
  "result": {
    "capacity": 10000,
    "level": 0
  }
}