Entity Listener and caching for distributed system

We have two application server.One is App server and other one is API server. Both have different caching system.If one change the DB other does not get known.Below is the Image for our architecture and we have used spring framework (Ehcache) for caching.

We also have entity listener in our project. If one flow change the DB So other flow does not get affected. How can we sync both Application Server and caching? Please help on this.