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Let's look at an example. The following is a simply simple interceptor that "logs" a message before and after every lifecycle stage:
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In fact interceptors can decide to skip a stage entirely, or even abort execution early by returning a Resolution. When an interceptors interceptor does this, the resolution is executed and the rest of the lifecycle is omitted.
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The SpringInterceptorSupport class is a simple base class that provide provides Spring bean injection into custom interceptors. Otherwise there is no difference between extending SpringInterceptorSupport and implementing Interceptor directly.