如何在JAX-RS应用程序中更改Jackson版本（WebSphere Liberty） [英] How to change Jackson version in JAX-RS app (WebSphere Liberty)
问题描述
我正在将JAX-RS应用程序从WebSphere 8.0迁移到WebSphere Liberty 8.5.5。
I am migrating a JAX-RS application from WebSphere 8.0 to WebSphere Liberty 8.5.5.
在WebSphere 8.0中，Jackson由WebSphere提供。我可以找到 jackson-core-asl-1.9.12.jar ， jackson-jaxrs-1.9.12.jar ， jackson-mapper-asl-1.9.12.jar 和 jackson-xc-1.9.12.jar 中的文件 AppServer \plugins \ 目录。
In WebSphere 8.0, Jackson was provided by WebSphere. I can find jackson-core-asl-1.9.12.jar, jackson-jaxrs-1.9.12.jar, jackson-mapper-asl-1.9.12.jar and jackson-xc-1.9.12.jar files in the AppServer\plugins\ directory.
在新的应用程序服务器（WebSphere Liberty）中，我得到了以下异常： org.codehaus.jackson.map.exc.UnrecognizedPropertyException：无法识别的字段myPropertyName。我认为发生此异常是因为序列化类上的注释 @JenIgnoreProperties（ignoreUnknown = true）不起作用。我的猜测是因为WebSphere Liberty 8.5.5提供了旧版本的Jackson。
In the new application server (WebSphere Liberty), I get the following exception: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "myPropertyName". I think that this exception happens because the annotation @JsonIgnoreProperties(ignoreUnknown = true) on the serialized classes does not work. My guess is that it happens because WebSphere Liberty 8.5.5 provides an older version of Jackson.
我试图用我的应用程序部署我需要的Jackson版本，
但它没有帮助（我仍然有例外）。如何让WebSphere Liberty使用我需要的Jackson版本？
I tried to deploy the version of Jackson which I need with my application, but it did not help (I still have exceptions). How can I make WebSphere Liberty use the version of Jackson that I need?
推荐答案
WebSphere Liberty将使用您指定的Jackson版本使用JAX-RS 2.0，有一些注意事项（我们正在追逐）。
WebSphere Liberty will use the version of Jackson you specify with JAX-RS 2.0, with a few caveats (which we are chasing).
A）您仍然必须明确指定JSON提供程序。
A) You still have to specify JSON providers explicitly.
B）您可能会看到如此处所述的16.0.0的NPE： Regiser JacksonJsonProvider in Websphere liberty profile 。我们已经如上所述解决了这个问题。最新的测试版没有出现此行为，这表明下一次运行时更新也不会。
B) You may see an NPE with 16.0.0.2 as described here: Regiser JacksonJsonProvider in Websphere liberty profile. We've worked around that as described. The most recent beta doesn't exhibit this behavior, which suggests the next runtime update won't either.
和
我们的gradle构建带来了jackson依赖：
https://github.com/gameontext/gameon-mediator/blob/6b469d18965673af35129abf3ff987b61af54c88 /mediator-app/build.gradle
Our gradle build brings in the jackson dependency: https://github.com/gameontext/gameon-mediator/blob/6b469d18965673af35129abf3ff987b61af54c88/mediator-app/build.gradle
我们的server.xml使用jaxrs-2.0，但不执行任何类加载器魔术：
https：// github。 com / gameontext / gameon-mediator / blob / 6b469d18965673af35129abf3ff987b61af54c88 / mediator-wlpcfg / servers / gameon-mediator / server.xml
And our server.xml uses jaxrs-2.0, but doesn't do any classloader magic: https://github.com/gameontext/gameon-mediator/blob/6b469d18965673af35129abf3ff987b61af54c88/mediator-wlpcfg/servers/gameon-mediator/server.xml
HTH
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