Merge pull request #47171 from geoand/#47166

Fail when a ContextResolver is registered on the client via a lambda

Author: gsmet

independent-projects/resteasy-reactive/common/runtime/src/main/java/org/jboss/resteasy/reactive/common/jaxrs/ConfigurationImpl.java

@@ -321,6 +321,10 @@ private void register(Object component, Integer priority) {
             Class<?> componentClass = component.getClass();
             Type[] args = Types.findParameterizedTypes(componentClass, ContextResolver.class);
             Class<?> key = args != null && args.length == 1 ? Types.getRawType(args[0]) : Object.class;
+            // in this case we are almost certain a lambda was used so we should fail
+            if ((key == Object.class) && component.getClass().isSynthetic()) {
+                throw new IllegalArgumentException("Registering a ContextResolver via a lambda is not supported");
+            }
             int effectivePriority = priority != null ? priority : determinePriority(component);
             contextResolvers.computeIfAbsent(key, k -> new MultivaluedTreeMap<>())
                     .add(effectivePriority, (ContextResolver<?>) component);