Spring/Java folks. Is there a way to create/use shared variables among multiple instances of same service? Fundamentally, I have a

HashMap

that needs to be shared among all 3 instances of the service. I am reluctant to use a common-storage-file/AWS/database. What is the way to go?

I’ve heard about redis caching and hazelcast. Have you tried them?

Redis is the way to go

I have used Hazelcast for exactly same purpose in a spring application. Open to have a chat if you want to discuss.