HandlerInterceptor里@Autowired对象为空的解决方法

That’s because Spring isn’t managing your PagePopulationInterceptor instance. You are creating it yourself in the below (拦截器内使用@Autowired时出现了null,这是由于你的spring对象注入时机在你的拦截器之后了)

public @Override void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new PagePopulationInterceptor());
}

change that to

@Bean
public PagePopulationInterceptor pagePopulationInterceptor() {
    return new PagePopulationInterceptor();
}

public @Override void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(pagePopulationInterceptor());
}
in this way, Spring will manage the lifecycle of the PagePopulationInterceptor instance since it's generated from a @Bean method. Spring will scan it for @Autowired targets and inject them.  This assumes that PagePopulationInterceptor is in a package to be @ComponentScaned.

原文 

http://www.cnblogs.com/lori/p/9259864.html

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