Fix request: False positive in AvoidObjectMapperAsField

[basvz]

In order to change how JacksonJsonProvider maps JSON ("application/json") content to and from Java Objects ("POJO"s). You can use a ContextResolver implementation like this

public class MapperContextResolver implements ContextResolver<ObjectMapper> {

    private final ObjectMapper mapper;

    public MapperContextResolver() {
        mapper = new ObjectMapper();
        // do any configurations to mapper
    }

    @Override
    public ObjectMapper getContext(Class<?> cls) {
        return mapper;
    }
}

JacksonJsonProvider expects a ObjectMapper so you cannot return a ObjectReader or ObjectWriter. So in this case you would want the ObjectMapper als a field, because then it can be created one time in the constructor or static block instead of in the getContext method which would break the ObjectMapperCreatedForEachMethodCall rule

[jborgers]

Thanks for reporting, we will look into it. Priority is still to migrate to pmd-7 fully with little false positives. When done, this issue can be picked up.