Major Description
JacksonJsonProvider in Jackson 2.2 changes the signature to:
JacksonJsonProvider extends ProviderBase<JacksonJsonProvider, ObjectMapper, JsonEndpointConfig, JsonMapperConfigurator>
That means it'll never get picked as a candidate for a message reader, because ProviderFactory#handleMapper has this:
Class<?> mapperClass = ClassHelper.getRealClass(em.getProvider());
Type[] types = getGenericInterfaces(mapperClass);
for (Type t : types) {
if (t instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType)t;
Type[] args = pt.getActualTypeArguments();
for (int i = 0; i < args.length; i++) {
Type arg = args[i];
if (arg instanceof TypeVariable) { // <------ Always fail
TypeVariable var = (TypeVariable)arg;
Type[] bounds = var.getBounds();
And the symptom is that my API client (which has a dependency on Jackson 2.2.2) errors out like this:
Caused by: javax.ws.rs.WebApplicationException: javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"items"). Expected elements are <{}cluster>,<{}clusterList>,<{}clusterRef>,<{}config>,<{}configList>,<{}healthCheck>,<{}parcel>,<{}role>,<{}roleConfigGroup>,<{}roleConfigGroupRef>,<{}roleTypeConfig>,<{}service>,<{}serviceConfig>,<{}serviceRef>
at org.apache.cxf.jaxrs.provider.AbstractJAXBProvider.handleExceptionEnd(AbstractJAXBProvider.java:602)
at org.apache.cxf.jaxrs.provider.AbstractJAXBProvider.handleJAXBException(AbstractJAXBProvider.java:614)
at org.apache.cxf.jaxrs.provider.JSONProvider.readFrom(JSONProvider.java:248)
Note the last line. It should've used JacksonJsonProvider instead.