I want to load the data from database into cache memory using Spring ehCache when the application starts i.e when the server starts before any other method is called. I dont
As @LouisJacomet mentioned you need to implement BootstrapCacheLoader, this implementation is what will do your preloading. Since you are using Spring you will create a bean of the implemented class and call EhCacheFactoryBean.setBootstrapCacheLoader so that the cache factory is aware of the loader.
Here is a link with a complete implementation. https://javaglobin.wordpress.com/2013/11/13/declarative-caching-with-spring/
Have a look at MyBootstrapCacheLoaderFactory and also note that there is a EhCacheFactoryBean bean that is called ehCacheFactory.