Problem: can't bind late query/mutation providers

Solution: make respective references greedy

Author: yrashk

src/main/java/graphql/servlet/GraphQLServlet.java

@@ -95,7 +95,7 @@ public GraphQLServlet() {
         updateSchema();
     }
 
-    @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC)
+    @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC, policyOption = ReferencePolicyOption.GREEDY)
     public void bindQueryProvider(GraphQLQueryProvider queryProvider) {
         queryProviders.add(queryProvider);
         updateSchema();
@@ -105,7 +105,7 @@ public void unbindQueryProvider(GraphQLQueryProvider queryProvider) {
         updateSchema();
     }
 
-    @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC)
+    @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC, policyOption = ReferencePolicyOption.GREEDY)
     public void bindMutationProvider(GraphQLMutationProvider mutationProvider) {
         mutationProviders.add(mutationProvider);
         updateSchema();