Jackson JsonParseExceptionMapper 和 JsonMappingExceptionMapper 阴影自定义映射器

2022-01-21 00:00:00 java spring-boot jersey

我的项目使用 Spring Boot + Jersey 2.

My project uses Spring Boot + Jersey 2.

我为 JsonParseException 创建了自定义 Jackson 映射器，但它没有被调用，而是使用了标准 Jackson JsonParseExceptionMapper.

I created custom Jackson mapper for JsonParseException, but it didn't get called, standard Jackson JsonParseExceptionMapper used instead.

我的自定义映射器:

 package com.rmn.gfc.common.providers;
 import ...

 @Provider
 public class JsonParseExceptionHandler implements ExceptionMapper<JsonParseException> { 
    @Override
    public Response toResponse(JsonParseException exception) {
        return Response
                .status(Response.Status.BAD_REQUEST)
                //  entity ...
                .build();
    }
}

我这样注册我的映射器:

I register my mapper like this:

@Component
public class OrderServiceResourceConfig extends ResourceConfig {
    public OrderServiceResourceConfig() {
        packages("com.rmn.gfc.common.providers");
    }
}

我确信映射器注册没问题，因为该包中的其他自定义映射器正在工作，但 JsonParseException 的一个映射器被 Jersey 标准 JsonParseExceptionMapper 遮蔽.

I am sure that mapper registration is fine because other custom mappers from this package is working, but one for JsonParseException is shadowed by Jersey standard JsonParseExceptionMapper.

如何用我的实现覆盖标准的 Jackson JsonParseExceptionMapper?

How could I override standard Jackson JsonParseExceptionMapper with my implementation?

推荐答案

我找到了适合我的解决方案.
在自定义映射器上使用 javax.annotation.Priority 使其覆盖 Jackson 默认映射器，例如:

I found solution that is fine for me.
Use javax.annotation.Priority on your custom mapper to make it override Jackson default mapper, e.g.:

@Provider
@Priority(1)
public class JsonParseExceptionHandler implements ExceptionMapper<JsonParseException> {
    // ...
}

或者，如果你通过 ResourceConfig 注册 JAX-RS 组件，你可以像这样指定优先级:

OR , if you register JAX-RS components via ResourceConfig, you can specify priority like this:

public class MyResourceConfig extends ResourceConfig {
    public MyResourceConfig() {
        register(JsonMappingExceptionHandler.class, 1);
        register(JsonParseExceptionHandler.class, 1);
        // ...
    }
}

数字越小优先级越高.
javax.ws.rs.Priorities 有一些预定义的优先级常量.

The lower number the highest priority.
javax.ws.rs.Priorities has some predefined constants for priorities.

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