泽西岛:给定无效的请求正文时，返回400错误而不是500错误 [英] Jersey: Returning 400 error instead of 500 when given invalid request body

问题描述

我正在使用Jersey的集成Jackson处理将传入的JSON转换为POJO，例如:

I'm using Jersey's integrated Jackson processing to transform incoming JSON to a POJO, e.g.:

@POST
@Consumes(MediaType.APPLICATION_JSON)
public Response newCustomer( CustomerRepresentation customer)
{
...
}

如果客户端发送带有无效字段的JSON，Jersey当前返回500 Internal Server Error.相反，我想返回一个400 Bad Request，最好返回一些有意义的细节，以指示哪些字段有误.

If a client sends JSON with invalid fields Jersey currently returns a 500 Internal Server Error. Instead, I'd like to return a 400 Bad Request, preferably with some meaningful detail indicating which fields are in error.

对如何实现此目标有任何见解? (至少返回通用400而不是完全不合适的500?)

Any insight into how this could be accomplished? (At least returning a generic 400 instead of the completely inappropriate 500?)

更新: 这是在调用处理程序之前在服务器端生成的异常:

Update: Here's the exception being generated server-side, before my handler is invoked:

javax.servlet.ServletException: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: 
Unrecognized field "this_isnt_a_known"_field" (Class com.redacted....), not marked as ignorable

推荐答案

我终于能够通过实现ExceptionMapper来捕获Jackson抛出的UnrecognizedPropertyException并将其映射到400 Bad Request响应来解决此问题. :

I was finally able to work around this problem by implementing an ExceptionMapper to catch the UnrecognizedPropertyException thrown by Jackson and map it to a 400 Bad Request response:

@Provider
public class UnrecognizedPropertyExceptionMapper implements ExceptionMapper<UnrecognizedPropertyException>
{

    @Override
    public Response toResponse(UnrecognizedPropertyException exception)
    {
        return Response
                .status(Response.Status.BAD_REQUEST)
                .entity( "'" + exception.getUnrecognizedPropertyName() + "' is an unrecognized field.")
                .type( MediaType.TEXT_PLAIN)
                .build();
    }

}

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