What is the difference between cglib proxy and jdk dynamic proxy?

The difference between cglib proxy and jdk dynamic proxy is that JDK dynamic proxy creates proxy instances of the proxy object based on interfaces, while Cglib proxy generates subclasses of the proxy class based on inheritance.

Operating system for this tutorial: Windows 10 system, jdk15 version, Dell G3 computer.

JDK dynamic proxy and Cglib proxy are both implementation methods of proxy in Java language. There are certain differences between the two in terms of usage, performance and applicable scenarios:

1. JDK dynamic Proxy:

• Create a proxy instance of the proxied object based on the interface. When an object is to be proxied, it must implement one or more interfaces and rely on the JDK library. JDK dynamic proxy uses the reflection mechanism to generate a proxy class that contains all interfaces of the proxy object, and covers all methods in the interface, which can proxy the target object.

• Advantages: No need to reference third-party libraries, it can be run in the JRE runtime environment, and generating proxy objects is simpler and faster; Disadvantages: Only proxying based on interfaces is supported, and classes cannot be agent, so its role is limited.

2. Cglib proxy:

• Generate subclasses of the proxy class based on inheritance , thereby adding proxy logic. Because it inherits the proxied class, it will be affected by non-inheritable attributes such as final classes, private, and static.

• Advantages: Cglib supports proxying classes. Even if there is no interface, it can be achieved indirectly by setting a callback interface. The performance is higher than JDK dynamic proxy, and it can proxy target objects that do not implement any interface.

In the process of generating proxy classes, Cglib adopts the method of dynamically generating bytecode. The proxy class is created and cached in memory before being loaded by the proxy class. On each call, the cached proxy class is used directly. In most cases, Cglib proxies are more suitable for large-scale method interception and enhancement scenarios than JDK dynamic proxies.

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