让 micronaut 使用我的“JacksonConfiguration"实例

问题描述

我试图让 micronaut (1.2.6) 使用我的代码来实例化 JacksonConfiguration 而不是默认机制.

I'm trying to get micronaut (1.2.6) to use my code to instantiate a JacksonConfiguration instead of the default mechanism.

我有这个:

@Factory
public class MyFactory {

    @Singleton
    public JacksonConfiguration jacksonConfiguration() {
        JacksonConfiguration cfg = new JacksonConfiguration();
        System.out.println("jacksonConfiguration() - hashcode is " + System.identityHashCode(cfg));
        return cfg;
    }

    @Factory
    public static class MyObjectMapperFactory extends ObjectMapperFactory {
        @Override
        @Singleton @Replaces(ObjectMapper.class)
        public ObjectMapper objectMapper(@Nullable JacksonConfiguration jacksonConfiguration, @Nullable JsonFactory jsonFactory) {
            System.out.println("objectMapper()         - hashcode is " + System.identityHashCode(jacksonConfiguration));
            return super.objectMapper(jacksonConfiguration, jsonFactory);
        }
    }

}

而且，当 ObjectMapper 工厂接收到 JacksonConfiguration 的实例时，我的另一个方法从未被调用.

and, while the ObjectMapper factory receives and instance of JacksonConfiguration, my other method is never called.

我尝试将 @Replaces(JacksonConfiguration.class) 添加到我的 jacksonConfiguration() 方法中，但这会导致 ObjectMapper 工厂方法成为使用 null 而不是 JacksonConfiguration 的实例调用(不知道为什么).

I tried adding @Replaces(JacksonConfiguration.class) to my jacksonConfiguration() method, but that causes the ObjectMapper factory method to be called with null instead of an instance of JacksonConfiguration (no idea why).

我应该怎么做来替换默认的 JacksonConfiguraion?

What should I do to replace the default JacksonConfiguraion?

附注:我知道我可以忽略它并以任何我想要的方式实例化我的 ObjectMappers (这就是我会做的直到我理解这个问题).这里的重点是更多地了解 micronaut 的工作原理，而不是为特定的实际问题找到解决方案/变通办法.

PS:I know I can just ignore it and instantiate my ObjectMappers any way I want (that's what I'll do until I understand this issue).The point here is more understanding how micronaut works than finding a solution/workaround to a specific practical problem.

推荐答案

使用您当前的代码，我希望抛出 NonUniqueBean 异常，因为会有多个 JacksonConfiguration bean.你应该将你的配置为 @Replaces(JacksonConfiguration.class).

With your current code I would expect a NonUniqueBean exception to be thrown because there would be multiple JacksonConfiguration beans. You should configure yours to @Replaces(JacksonConfiguration.class).

请注意，存在与替换配置属性 bean 相关的错误，该错误已在 1.3.0.M1 和最新的 1.2.8.BUILD-SNAPSHOT 中解决，因此您需要使用其中一个版本

Note there was a bug related to replacing configuration properties beans that was resolved in 1.3.0.M1 and the latest 1.2.8.BUILD-SNAPSHOT so you will need to use one of those versions

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