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I don't know the meaning of using proxy in spring. what is efficient?
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The Proxy pattern uses a proxy (surrogate) object “in place of” another object. The objective of a proxy object is to control the creation of and access to the real object it represents.
Spring used two types of proxy strategy one is JDK dynamic proxy and other one is CGLIB proxy.
Thus, a dynamic proxy class can be used to create a type-safe proxy object for a list of interfaces without requiring pre-generation of the proxy class, such as with compile-time tools.
Dynamic proxies allow one single class with one single method to service multiple method calls to arbitrary classes with an arbitrary number of methods. A dynamic proxy can be thought of as a kind of Facade, but one that can pretend to be an implementation of any interface.
Proxies are used by AOP. In short:
Normally you have.
Caller --> Real object But when, for example, you want automatic transaction management, spring puts a proxy of your real object
Caller --> Proxy --> Real object where the proxy starts the transaction.
Here is nice article explaining both the essence of proxies and their efficiency (performance) in spring
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