Spring静态初始化bean

发布于 2024-10-04 03:48:05 字数 715 浏览 4 评论 0原文

嘿，在 Spring 中应该如何处理静态初始化？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();

，我需要注意 ErrorExceptionMapping 之前已加载。我尝试了这个：

<bean id="errorExceptionMapping" class="cz.instance.transl.util.ErrorExceptionMapping" />
<bean id="validateService" class="cz.instance.transl.services.ValidateService" depends-on="errorExceptionMapping" >

但是我得到了

java.lang.NoClassDefFoundError: Could not initialize class cz.instance.transl.util.ErrorExceptionMapping

如果我省略静态初始化或从 bean 的方法中调用该方法，那当然没问题。我认为初始化回调（affterPropertiesSet()）在这里没有帮助。

原文

Hey,
how one should deal with static initializations in Spring ? I mean, my bean has a static initialization

private static final Map<String, String> exceptionMapping = ErrorExceptionMapping.getExceptionMapping();

And I need to take care that ErrorExceptionMapping is loaded before. I tried this:

<bean id="errorExceptionMapping" class="cz.instance.transl.util.ErrorExceptionMapping" />
<bean id="validateService" class="cz.instance.transl.services.ValidateService" depends-on="errorExceptionMapping" >

But I got

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.

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柠檬色的秋千 2024-10-11 03:48:05

对其他 bean 进行静态依赖并不是 Spring 的方式。

但是，如果您想使其保持静态，则可以延迟初始化它 - 在这种情况下，depends-on 可以强制执行正确的初始化顺序。

编辑：通过延迟加载，我的意思是这样的（我在这里使用holder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(); 
}

并使用ExceptionMappingHolder.exceptionMapping而不是异常映射。

Having static dependencies on other beans is not a Spring way.

However, if you want to keep it static, you can initialize it lazily - in that case depends-on can enforce proper initialization order.

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):

private static class ExceptionMappingHolder {
    private static final Map<String, String> exceptionMapping = 
        ErrorExceptionMapping.getExceptionMapping(); 
}

and use ExceptionMappingHolder.exceptionMapping instead of exceptionMapping.

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