Jackson 2 on Wildfly 10: How to load ProviderBase? - jackson

Question

There seems to be a lot of questions related to Wildfly and Jackson, yet I could not solve my problem despite searching the site far and wide...
I want to use Jackson 2 to handle JSON serialization on an app deployed on Wildfly 10, but I keep getting stuck on loading the com.fasterxml.jackson.jaxrs.base.ProviderBase class.
Offending code:
#Provider
public class CustomJsonProvider extends ResteasyJackson2Provider {
#Inject
private CustomSerializer customSerializer;
private List<JsonSerializer<?>> getSerializers() {
final List<JsonSerializer<?>> result = new ArrayList<>();
// Add custom serializers here.
result.add(customSerializer);
return result;
}
#Override
public void writeTo(Object value, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException {
final List<JsonSerializer<?>> serializers = getSerializers();
final ObjectMapper mapper = locateMapper(type, mediaType);
final SimpleModule zeModule = new SimpleModule("App", Version.unknownVersion(), serializers);
mapper.registerModule(zeModule);
this.setMapper(mapper);
super.writeTo(value, type, genericType, annotations, mediaType, httpHeaders, entityStream);
}
}
In my pom.xml, I have:
<dependencies>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.0.18.Final</version>
<scope>provided</scope>
<type>jar</type>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson2-provider</artifactId>
<version>3.0.18.Final</version>
</dependency>
<!-- dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-base</artifactId>
<version>2.5.4</version>
<scope>provided</scope>
</dependency -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
And in the jboss-deployment-structure.xml file:
<deployment>
<exclusions>
<module name="org.apache.commons.logging" />
<module name="org.apache.log4j" />
<module name="org.jboss.logging" />
<module name="org.jboss.logging.jul-to-slf4j-stub" />
<module name="org.jboss.logmanager" />
<module name="org.jboss.logmanager.log4j" />
<module name="org.slf4j.impl" />
<module name="org.codehaus.jackson" />
<module name="org.codehaus.jackson.jackson-mapper-asl" />
<module name="org.codehaus.jettison" />
<module name="org.jboss.resteasy.resteasy-jackson-provider" />
<module name="org.jboss.resteasy.resteasy-jettison-provider" />
</exclusions>
<dependencies>
<module name="org.jboss.resteasy.resteasy-jackson2-provider" services="import"/>
</dependencies>
</deployment>
With this configuration, compile and deployment go smoothly, but on runtime, I get the following exception:
Caused by: java.lang.LinkageError: loader constraint violation: when
resolving overridden method
"com.my.package.CustomJsonProvider$Proxy$_$$WeldClientProxy.disable(Lcom/fasterxml/jackson/databind/SerializationFeature;)Lcom/fasterxml/jackson/jaxrs/base/ProviderBase;"
the class loader (instance of org/jboss/modules/ModuleClassLoader) of
the current class,
com/my/package/CustomJsonProvider$Proxy$$$_WeldClientProxy, and its
superclass loader (instance of org/jboss/modules/ModuleClassLoader),
have different Class objects for the type
com/fasterxml/jackson/jaxrs/base/ProviderBase used in the signature
From what I gathered, there is a different version of ProviderBase loaded by Wildfly's classloader. So I figured that using the provided version would solve the problem (with the possible side-effect of unexpect implementation differences, but still).
Problem is, if I uncomment the commented dependency in the POM, de facto using the version of com.fasterxml.jackson.jaxrs:jackson-jaxrs-baseprovided in Wildlfy, it complains again at runtime:
Caused by: java.lang.ClassNotFoundException:
com.fasterxml.jackson.jaxrs.base.ProviderBase from [Module
"deployment.myapp-ear-0.1-SNAPSHOT.ear.myapp-core-0.1-SNAPSHOT.jar:main"
from Service Module Loader]
This seems to be a problem of conflicting classloaders.
What am I missing and how can I solve this?