Sharing data between two instances in a load balanced java web application

I want to cache data in a java web application deployed on multiple instances. We are using spring 2.5.6. What is the easiest caching library to configure and use with spring? I have heard of EH Cache, but the configuration is too cumbersome. The requirement is that a spring scheduler will run and set some flags. These flags are accessible from all load balanced ins开发者_JAVA技巧tances. But since the scheduler runs only on one instance the flag is set only on that jvm. So how do i make these updated flag values available to all load balanced instances?

We went from EHCache to Memcached. It's much easier to both configure and implement.