如何在Payara 5中使用Jackson 2? [英] How to use Jackson 2 in Payara 5?

问题描述

我正在将Jackson 2与Payara 4结合使用，我想在Payara 5中使用 Jackson 2 .

I'm using Jackson 2 with Payara 4 and I would liked to use Jackson 2 in Payara 5.

我还希望避免使用JAX-RS更改批注等.

Using JAX-RS, I also would like to avoid changing annotations and so on...

在Payara 5中，默认的Jsonb提供程序是Yasson. 有禁用它并使用Jackson的想法吗?欢迎所有评论/想法:-)

In Payara 5 the default Jsonb provider is Yasson. Any ideas to disable it and use Jackson instead? All comments/ideas are welcome :-)

注意: Yasson非常有趣，但是处理抽象类或接口的序列化/反序列化要比放置Jackson注释复杂得多. 我目前的理解是，它需要实现JsonbSerializer/Deserializer，但实际上，序列化器/反序列化器仅在字段/方法上可用(为类打开了一个问题，这将非常有帮助). 无论如何，迁移到Yasson意味着将根据需要(对于实体以及当然是集合)实现许多序列化器/反序列化器，但是我想这很困难.

NB: Yasson is very interesting but handle abstract class or interface serialization/deserialization is a little more complex than putting a Jackson annotation. My current understanding is that it requires to implement a JsonbSerializer/Deserializer but actually the serializer/deserializer is only available on field/method (an issue is opened for class, which will be very helpful). Anyway, migrating to Yasson will mean implementing many serializer/deserializer as required (for entities and of course collections) but I guess it's a hard stuff.

推荐答案

您需要将属性jersey.config.jsonFeature设置为JacksonFeature，以便不注册默认的JsonB功能.

You need to set the property jersey.config.jsonFeature to JacksonFeature so that the default JsonB feature isn't registered.

您可以通过覆盖Application.getProperties()方法在代码中进行设置，也可以将web.xml中的属性设置为context-param:

You can set it either in the code by overriding the Application.getProperties() method, or set the property in web.xml as context-param:

<context-param>
  <param-name>jersey.config.jsonFeature</param-name>
  <param-value>JacksonFeature</param-value>
</context-param>

如果您的Jersey Servlet是在web.xml上显式声明的(作为javax.ws.rs.core.Application或作为自定义子类)，请在Jersey Application Servlet声明中使用init-param代替:

If your Jersey Servlet is explicitly declared at web.xml (either as javax.ws.rs.core.Application or a as custom subclass), then use init-param instead, within the Jersey Application servlet declaration:

<servlet>
    <servlet-name>javax.ws.rs.core.Application</servlet-name>
    <init-param>
        <param-name>jersey.config.jsonFeature</param-name>
        <param-value>JacksonFeature</param-value>
    </init-param>
    ...
</servlet>

您还需要将Jackson依赖项添加到您的应用程序中-但是您可能已经这样做了，因此请忽略此内容.

You also need to add Jackson dependencies into your application - but you have probably done that already so ignore this.

说明:

MOXy功能提供了属性jersey.config.disableMoxyJson以将其禁用. Payara 5中默认的JsonB功能不提供此类属性，但是如果jersey.config.jsonFeature属性存在且不是JsonBindingFeature，则不会自行注册.相同的属性可用于所有Jersey功能，因此将其设置为JacksonFeature将仅允许注册JacksonFeature.

The MOXy feature provides a property jersey.config.disableMoxyJson to disable it. The JsonB feature default in Payara 5 doesn't provide such property but will not register itself if jersey.config.jsonFeature property exists and is not JsonBindingFeature. The same property works for all Jersey features so setting it to JacksonFeature will allow only the JacksonFeature to be registered.

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