Neal Hu created CXF-6870:
----------------------------

             Summary: CXF doesn't check the message body's generic type
                 Key: CXF-6870
                 URL: https://issues.apache.org/jira/browse/CXF-6870
             Project: CXF
          Issue Type: Bug
          Components: JAX-RS
    Affects Versions: 3.0.9, 3.1.6, 3.1.3
         Environment: mac, windows
            Reporter: Neal Hu
             Fix For: 3.0.10, 3.1.7, 3.2.0


CXF doesn't check the message body's generic type, please see the sample below.
{code:java}
public class ListAProvider implements MessageBodyWriter<List<String>> 
public class ListBProvider implements MessageBodyWriter<List<Integer>> 

resource class:

        @GET
        @Path("/echo/{param}")
        @Produces("application/json")
        public List<String> echo(@PathParam("param")String name){
                List<String> list = new ArrayList<String>();
                list.add("hello");
                list.add(name);
                return list;
        }
        
        @GET
        @Path("/echo2/{param}")
        @Produces("application/json")
        public List<Integer> echo2(@PathParam("param")String name){
                List<Integer> list = new ArrayList<Integer>();
                list.add(1);
                list.add(2);
                return list;
        }
{code}

No matter you request echo or echo2 resource method, the selected provider is 
ListBProvider



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