spring bean的Spring静态初始化
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Spring static initialization of a bean
提问by lisak
Hey, how one should deal with static initializations in Spring ? I mean, my bean has a static initialization
嘿，应该如何处理 Spring 中的静态初始化？我的意思是，我的 bean 有一个静态初始化
private static final Map<String, String> exceptionMapping = ErrorExceptionMapping.getExceptionMapping();
And I need to take care that ErrorExceptionMapping is loaded before. I tried this:
而且我需要注意之前加载了 ErrorExceptionMapping 。我试过这个：
<bean id="errorExceptionMapping" class="cz.instance.transl.util.ErrorExceptionMapping" />
<bean id="validateService" class="cz.instance.transl.services.ValidateService" depends-on="errorExceptionMapping" >
But I got
但我得到了
java.lang.NoClassDefFoundError: Could not initialize class cz.instance.transl.util.ErrorExceptionMapping
If I omit the static initialization or call the method from within the bean's method, its of course fine. I suppose that Initialization callback (affterPropertiesSet()) wouldn't help here.
如果我省略静态初始化或从 bean 的方法中调用该方法，当然没问题。我想初始化回调 (affterPropertiesSet()) 在这里没有帮助。
回答by dcp
You should be able to mark the class with the @Componentannotation, then add a non static setter with @Autowired(required=true)annotation for setting the static variable.
您应该能够使用@Component注释标记类，然后添加一个带有@Autowired(required=true)注释的非静态设置器来设置静态变量。
Here's a linkfor more info.
回答by axtavt
Having staticdependencies on other beans is not a Spring way.
有static其它的bean的依赖不是春路。
However, if you want to keep it static, you can initialize it lazily - in that case depends-oncan enforce proper initialization order.
但是，如果您想保留它static，您可以延迟初始化它 - 在这种情况下depends-on可以强制执行正确的初始化顺序。
EDIT:By lazy loading I mean something like this (I use lazy initialization with holder class idiom here, other lazy initialization idioms can be used instead):
编辑：通过延迟加载，我的意思是这样的（我在这里使用带有持有者类习惯用法的延迟初始化，可以使用其他延迟初始化习惯用法）：
private static class ExceptionMappingHolder {
private static final Map<String, String> exceptionMapping =
ErrorExceptionMapping.getExceptionMapping();
}
and use ExceptionMappingHolder.exceptionMappinginstead of exceptionMapping.
并使用ExceptionMappingHolder.exceptionMapping代替exceptionMapping.
