The following example shows the issue.

There are 3 methods for accept header matching for application/xml, application/json, */*.

.   
	@Produces(MediaType.WILDCARD)
	public Obj getObj(........);

	@Produces(MediaType.APPLICATION_XML)
	public Obj getObjAsXml(........);

	@Produces(MediaType.APPLICATION_JSON)
	public Obj getObjAsJson(........);

• Given accept header: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
  • Expected:
    • It should match to getObjAsXml() based on HTTP spec.
    • "application/xml" has higer priority than "*/*" for given accept header.
  • Actual:
    • It matches to getObj() instead.
      • line 180 of org.jboss.resteasy.core.registry.Segment.java

        .
              for (WeightedMediaType accept : accepts)
              {
                 for (WeightedMediaType produce : produces)
                 {
                    if (accept.isCompatible(produce)) return producesMap.get(produce);
                 }
        
              }
        

      • It binds to "*/*" instead of "application/xml" because of following situation.
        • the first "accept" object is "text/html"
        • the first "produce" object is "*/*".
        • "text/html".isCompatible("*/*) return true. As a result, it binds to wrong method.