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static 和 @postconstruct 区别：
static blocks are invoked when the class is being initialized, after it is loaded. The dependencies of your component haven’t been initialized yet. That is why you get a NullPointerException (Your dependencies are null) .
Move your code to a method annotated with @PostConstruct. This will ensure that your code will run when all the dependencies of your component are initialized
翻译：static 模块会被引入，当 class 加载后。你的 component 组件的依赖还没有初始化。这就是为什么你的代码块会报空指针异样。（你的依赖都是 null）
把你的代码移到一个 @PostConstruct 申明的办法块中，这样能够确保你的代码执行在所有组件都加载当前。
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