[Java] Fix compilation error for a Map<String, Set<InnerEnum>> due to incompatible types

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -4275,7 +4275,7 @@ protected void updateDataTypeWithEnumForMap(CodegenProperty property) {
 
         if (baseItem != null) {
             // set both datatype and datetypeWithEnum as only the inner type is enum
-            property.datatypeWithEnum = property.datatypeWithEnum.replace(", " + baseItem.baseType, ", " + toEnumName(baseItem));
+            property.datatypeWithEnum = property.datatypeWithEnum.replace(baseItem.baseType + ">", toEnumName(baseItem) + ">");
 
             // naming the enum with respect to the language enum naming convention
             // e.g. remove [], {} from array/map of enum

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java

@@ -2203,6 +2203,24 @@ public void shouldNotAddAdditionalModelAnnotationsToAbstractOpenApiSchema_issue1
             .bodyContainsLines("if (b.value.equals(value)) {");
     }
 
+    @Test public void testMapOfInnerEnum_issue19393() {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/issue_19393_map_of_inner_enum.yaml");
+        final JavaClientCodegen codegen = new JavaClientCodegen();
+        codegen.setOpenAPI(openAPI);
+        codegen.setOutputDir(newTempFolder().toString());
+
+        Map<String, File> files = new DefaultGenerator().opts(new ClientOptInput().openAPI(openAPI).config(codegen))
+                .generate().stream().collect(Collectors.toMap(File::getName, Function.identity()));
+
+        JavaFileAssert.assertThat(files.get("EmployeeWithMapOfEnum.java"))
+                .assertProperty("projectRole")
+                .withType("Map<String, InnerEnum>");
+
+        JavaFileAssert.assertThat(files.get("EmployeeWithMultiMapOfEnum.java"))
+                .assertProperty("projectRoles")
+                .withType("Map<String, Set<InnerEnum>>");
+    }
+
     @Test public void testWebClientResponseTypeWithUseAbstractionForFiles_issue16589() {
         final Path output = newTempFolder();
         final CodegenConfigurator configurator = new CodegenConfigurator()

modules/openapi-generator/src/test/resources/3_0/issue_19393_map_of_inner_enum.yaml

@@ -0,0 +1,40 @@
+openapi: 3.0.0
+info:
+  version: 1.0.0
+  title: OpenAPI Test API
+  license:
+    name: Apache-2.0
+    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+paths:
+  /status:
+    get:
+      responses:
+        '200':
+          description: desc
+components:
+  schemas:
+    EmployeeWithMapOfEnum:
+      type: object
+      properties:
+        projectRole:
+          type: object
+          additionalProperties:
+            type: string
+            enum:
+              - DEVELOPER
+              - TESTER
+              - OWNER
+    EmployeeWithMultiMapOfEnum:
+      type: object
+      properties:
+        projectRoles:
+          type: object
+          additionalProperties:
+            uniqueItems: true
+            type: array
+            items:
+              type: string
+              enum:
+                - DEVELOPER
+                - TESTER
+                - OWNER