I am migrating a JAX-RS application from WebSphere 8.0 to WebSphere Liberty 8.5.5.
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.
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.
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?
WebSphere Liberty will use the version of Jackson you specify with JAX-RS 2.0, with a few caveats (which we are chasing).
A) You still have to specify JSON providers explicitly.
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.
and
Our gradle build brings in the jackson dependency: https://github.com/gameontext/gameon-mediator/blob/6b469d18965673af35129abf3ff987b61af54c88/mediator-app/build.gradle
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