Support RestEasy's @ServerExceptionMapper method annotation

extension-jaxrs/pom.xml

@@ -59,7 +59,7 @@
         </dependency>
         <dependency>
             <groupId>io.quarkus.resteasy.reactive</groupId>
-            <artifactId>resteasy-reactive-common</artifactId>
+            <artifactId>resteasy-reactive</artifactId>
             <version>${version.quarkus}</version>
             <scope>test</scope>
         </dependency>

extension-jaxrs/src/main/java/io/smallrye/openapi/jaxrs/JaxRsAnnotationScanner.java

@@ -7,6 +7,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Deque;
+import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.List;
@@ -118,6 +119,7 @@ public boolean isFrameworkContextType(Type type) {
     }
 
     @Override
+    @SuppressWarnings("deprecation")
     public boolean containsScannerAnnotations(List<AnnotationInstance> instances,
             List<AnnotationScannerExtension> extensions) {
 
@@ -314,19 +316,27 @@ private void processResourceMethods(final ClassInfo resourceClass,
      *
      */
     private Map<DotName, Map<String, APIResponse>> processExceptionMappers() {
-        Collection<ClassInfo> exceptionMappers = new ArrayList<>();
+        Map<DotName, Map<String, APIResponse>> exceptionMappers = new HashMap<>();
 
-        for (DotName dn : JaxRsConstants.EXCEPTION_MAPPER) {
-            exceptionMappers.addAll(context.getIndex()
-                    .getKnownDirectImplementors(dn));
+        for (DotName mapperName : JaxRsConstants.EXCEPTION_MAPPER) {
+            for (var mapper : context.getIndex().getKnownDirectImplementors(mapperName)) {
+                exceptionMappers.putAll(exceptionResponseAnnotations(mapper));
+            }
+        }
+
+        for (var mapperAnnotation : context.getIndex().getAnnotations(RestEasyConstants.SERVER_EXCEPTION_MAPPER)) {
+            // @ServerExceptionMapper only targets methods
+            MethodInfo mapperMethod = mapperAnnotation.target().asMethod();
+            if (mapperMethod.parametersCount() == 1) {
+                DotName exceptionName = mapperMethod.parameterType(0).name();
+                exceptionMappers.put(exceptionName, context.io().apiResponsesIO().readAll(mapperMethod));
+            }
         }
 
-        return exceptionMappers.stream()
-                .flatMap(this::exceptionResponseAnnotations)
-                .collect(Collectors.toMap(Entry::getKey, Entry::getValue));
+        return exceptionMappers;
     }
 
-    private Stream<Entry<DotName, Map<String, APIResponse>>> exceptionResponseAnnotations(ClassInfo classInfo) {
+    private Map<DotName, Map<String, APIResponse>> exceptionResponseAnnotations(ClassInfo classInfo) {
 
         Type exceptionType = classInfo.interfaceTypes()
                 .stream()
@@ -338,7 +348,7 @@ private Stream<Entry<DotName, Map<String, APIResponse>>> exceptionResponseAnnota
                 .orElse(null);
 
         if (exceptionType == null) {
-            return Stream.empty();
+            return Collections.emptyMap();
         }
 
         Stream<Entry<String, APIResponse>> methodAnnotations = Stream
@@ -366,9 +376,9 @@ private Stream<Entry<DotName, Map<String, APIResponse>>> exceptionResponseAnnota
                 .collect(Collectors.toMap(Entry::getKey, Entry::getValue, latest, LinkedHashMap::new));
 
         if (annotations.isEmpty()) {
-            return Stream.empty();
+            return Collections.emptyMap();
         } else {
-            return Stream.of(entryOf(exceptionType.name(), annotations));
+            return Map.of(exceptionType.name(), annotations);
         }
     }
 

extension-jaxrs/src/main/java/io/smallrye/openapi/jaxrs/RestEasyConstants.java

@@ -86,6 +86,9 @@ public class RestEasyConstants {
                     MULTIPART_FORM_DATA_OUTPUT,
                     MULTIPART_RELATED_OUTPUT)));
 
+    public static final DotName SERVER_EXCEPTION_MAPPER = DotName
+            .createSimple("org.jboss.resteasy.reactive.server.ServerExceptionMapper");
+
     private RestEasyConstants() {
     }
 }

extension-jaxrs/src/test/java/io/smallrye/openapi/runtime/scanner/ExceptionMapperScanTests.java

@@ -23,7 +23,6 @@ void testJavaxExceptionMapper() throws IOException, JSONException {
         test("responses.exception-mapper-generation.json",
                 test.io.smallrye.openapi.runtime.scanner.javax.TestResource.class,
                 test.io.smallrye.openapi.runtime.scanner.javax.ExceptionHandler1.class,
-                test.io.smallrye.openapi.runtime.scanner.javax.ExceptionHandler2.class,
                 test.io.smallrye.openapi.runtime.scanner.javax.ResteasyReactiveExceptionMapper.class);
     }
 
@@ -32,7 +31,6 @@ void testJakartaExceptionMapper() throws IOException, JSONException {
         test("responses.exception-mapper-generation.json",
                 test.io.smallrye.openapi.runtime.scanner.jakarta.TestResource.class,
                 test.io.smallrye.openapi.runtime.scanner.jakarta.ExceptionHandler1.class,
-                test.io.smallrye.openapi.runtime.scanner.jakarta.ExceptionHandler2.class,
                 test.io.smallrye.openapi.runtime.scanner.jakarta.ResteasyReactiveExceptionMapper.class);
     }
 

extension-jaxrs/src/test/java/test/io/smallrye/openapi/runtime/scanner/jakarta/TestResource.java

@@ -5,6 +5,10 @@
 import jakarta.ws.rs.POST;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.WebApplicationException;
+import jakarta.ws.rs.core.Response;
+
+import org.eclipse.microprofile.openapi.annotations.responses.APIResponse;
+import org.jboss.resteasy.reactive.server.ServerExceptionMapper;
 
 @Path(value = "/resources")
 public class TestResource {
@@ -19,4 +23,9 @@ public String createResource() throws WebApplicationException {
         return "OK";
     }
 
+    @ServerExceptionMapper
+    @APIResponse(responseCode = "404", description = "Not Found")
+    public Response handleNotFound(NotFoundException exception) {
+        return exception.getResponse();
+    }
 }

extension-jaxrs/src/test/java/test/io/smallrye/openapi/runtime/scanner/javax/TestResource.java

@@ -5,6 +5,10 @@
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.Response;
+
+import org.eclipse.microprofile.openapi.annotations.responses.APIResponse;
+import org.jboss.resteasy.reactive.server.ServerExceptionMapper;
 
 @Path(value = "/resources")
 public class TestResource {
@@ -19,4 +23,9 @@ public String createResource() throws WebApplicationException {
         return "OK";
     }
 
+    @ServerExceptionMapper
+    @APIResponse(responseCode = "404", description = "Not Found")
+    public Response handleNotFound(NotFoundException exception) {
+        return exception.getResponse();
+    }
 }

extension-jaxrs/src/test/resources/io/smallrye/openapi/runtime/scanner/responses.exception-mapper-multiple-response-generation.json

@@ -13,6 +13,9 @@
                 }
               }
             }
+          },
+          "404" : {
+            "description" : "Not Found"
           }
         }
       },