fix handling of array types as generic type parameters

core/src/main/java/io/smallrye/openapi/runtime/scanner/dataobject/TypeProcessor.java

@@ -87,20 +87,7 @@ public Type processType() {
             return type;
         }
 
-        if (type.kind() == Type.Kind.WILDCARD_TYPE) {
-            type = TypeUtil.resolveWildcard(type.asWildcardType());
-        }
-
-        if (type.kind() == Type.Kind.TYPE_VARIABLE ||
-                type.kind() == Type.Kind.UNRESOLVED_TYPE_VARIABLE) {
-            // Resolve type variable to real variable.
-            type = resolveTypeVariable(schema, type, false);
-        }
-
-        if (TypeUtil.isWrappedType(type)) {
-            // Unwrap and proceed using the wrapped type
-            type = TypeUtil.unwrapType(type);
-        }
+        type = maybeResolveType(type);
 
         if (isArrayType(type, annotationTarget)) {
             return readArrayType(type.asArrayType(), this.schema);
@@ -150,6 +137,25 @@ public Type processType() {
         return type;
     }
 
+    private Type maybeResolveType(Type type) {
+        if (type.kind() == Type.Kind.WILDCARD_TYPE) {
+            type = TypeUtil.resolveWildcard(type.asWildcardType());
+        }
+
+        if (type.kind() == Type.Kind.TYPE_VARIABLE ||
+                type.kind() == Type.Kind.UNRESOLVED_TYPE_VARIABLE) {
+            // Resolve type variable to real variable.
+            type = resolveTypeVariable(schema, type, false);
+        }
+
+        if (TypeUtil.isWrappedType(type)) {
+            // Unwrap and proceed using the wrapped type
+            type = TypeUtil.unwrapType(type);
+        }
+
+        return type;
+    }
+
     /**
      * Only allow registration of a type if the annotation target (field or method) that
      * refers to the type's class is not annotated with an annotation that alters
@@ -313,29 +319,10 @@ private Schema resolveParameterizedType(Type valueType, Schema propsSchema) {
                         typeResolver,
                         propsSchema);
             }
+        } else if (isArrayType(valueType, null)) {
+            readArrayType(valueType.asArrayType(), propsSchema);
         } else if (index.containsClass(valueType)) {
-            if (isA(valueType, ENUM_TYPE)) {
-                DataObjectLogging.logger.processingEnum(type);
-                propsSchema = SchemaFactory.enumToSchema(context, valueType);
-            } else {
-                SchemaSupport.setType(propsSchema, Schema.SchemaType.OBJECT);
-            }
-
-            SchemaRegistry registry = context.getSchemaRegistry();
-
-            if (registry.hasSchema(valueType, context.getJsonViews(), typeResolver)) {
-                if (allowRegistration()) {
-                    propsSchema = registry.lookupRef(valueType, context.getJsonViews());
-                } else {
-                    pushToStack(valueType, propsSchema);
-                }
-            } else {
-                pushToStack(valueType, propsSchema);
-                if (allowRegistration()) {
-                    propsSchema = registry.registerReference(valueType, context.getJsonViews(), typeResolver,
-                            propsSchema);
-                }
-            }
+            propsSchema = resolveIndexedParameterizedType(valueType, propsSchema);
         }
 
         return propsSchema;
@@ -357,6 +344,33 @@ private Type resolveTypeVariable(Schema schema, Type fieldType, boolean pushToSt
         return resolvedType;
     }
 
+    private Schema resolveIndexedParameterizedType(Type valueType, Schema propsSchema) {
+        if (isA(valueType, ENUM_TYPE)) {
+            DataObjectLogging.logger.processingEnum(type);
+            propsSchema = SchemaFactory.enumToSchema(context, valueType);
+        } else {
+            SchemaSupport.setType(propsSchema, Schema.SchemaType.OBJECT);
+        }
+
+        SchemaRegistry registry = context.getSchemaRegistry();
+
+        if (registry.hasSchema(valueType, context.getJsonViews(), typeResolver)) {
+            if (allowRegistration()) {
+                propsSchema = registry.lookupRef(valueType, context.getJsonViews());
+            } else {
+                pushToStack(valueType, propsSchema);
+            }
+        } else {
+            pushToStack(valueType, propsSchema);
+            if (allowRegistration()) {
+                propsSchema = registry.registerReference(valueType, context.getJsonViews(), typeResolver,
+                        propsSchema);
+            }
+        }
+
+        return propsSchema;
+    }
+
     private void pushResolvedToStack(Type type, Schema schema) {
         Type resolvedType = this.typeResolver.resolve(type);
         pushToStack(resolvedType, schema);

core/src/test/java/io/smallrye/openapi/runtime/scanner/StandaloneSchemaScanTest.java

@@ -888,4 +888,17 @@ class Bean {
 
         assertJsonEquals("components.schemas.primitive-formats.json", Bean.class);
     }
+
+    @Test
+    void testMultidimensionalArrayGenericType() throws IOException, JSONException {
+        @Schema(name = "Bean")
+        class Bean {
+            @Schema(description = "Multi-dimensional Array.", examples = "[[[1.23, 1.0903]]]")
+            List<Double[][]> list;
+            @Schema(description = "Multi-dimensional Array.", examples = "{ \"data\": [[[1.23, 1.0903]]] }")
+            Map<String, List<Double[][]>> mapOfLists;
+        }
+
+        assertJsonEquals("components.schemas.multi-array-generic.json", Bean.class);
+    }
 }

core/src/test/resources/io/smallrye/openapi/runtime/scanner/components.schemas.multi-array-generic.json

@@ -0,0 +1,47 @@
+{
+  "openapi" : "3.1.0",
+  "components" : {
+    "schemas" : {
+      "Bean" : {
+        "type" : "object",
+        "properties" : {
+          "list" : {
+            "type" : "array",
+            "items" : {
+              "type" : "array",
+              "items" : {
+                "type" : "array",
+                "items" : {
+                  "type" : "number",
+                  "format" : "double"
+                }
+              }
+            },
+            "description" : "Multi-dimensional Array.",
+            "examples" : [ [ [ [ 1.23, 1.0903 ] ] ] ]
+          },
+          "mapOfLists" : {
+            "type" : "object",
+            "additionalProperties" : {
+              "type" : "array",
+              "items" : {
+                "type" : "array",
+                "items" : {
+                  "type" : "array",
+                  "items" : {
+                    "type" : "number",
+                    "format" : "double"
+                  }
+                }
+              }
+            },
+            "description" : "Multi-dimensional Array.",
+            "examples" : [ {
+              "data" : [ [ [ 1.23, 1.0903 ] ] ]
+            } ]
+          }
+        }
+      }
+    }
+  }
+}