#18058 Fix the Java generator to generate valid @RequestMappings where the produce field takes list of string parameters instead of a single comma-separated string (#18092)

* #18058 Fix AbstractJavaCodegen.getAccepts() so it returns a String array instead of a comma-separated string, and fixed api.mustache so the @RequestMapping annotation generated produces for x-accepts as a parameter list instead of a (single) string.

* #18058 Updated test case to accept a string array instead of a comma-separated list.

* #18058 Reverted changes on imported compared to the main branch.

* #18058 getAccepts() is now hybrid, and can return both a single String or a String[].

* #18058 Rolled back the hybrid getAccepts(), so it only returns a String array.

* #18058 Updated mustache files to cope with vendorExtensions.x-accepts being a string array instead of a comma-separated string.

* #18058 Generated new sample files with by running `./bin/generate-samples.sh ./bin/configs/*.yaml`

* #18058 Optimization of getAccepts()

* #18058 Regenerated scripts that got broken after resolving conflicts on GitHub

* #18058 Fixed introduced issue with api.mustache causing a redundant accept with @HttpExchange with the PetApi.java, StoreApi.java, and UserApi.java.

samples/client/petstore/java/native-async/api/openapi.yaml

@@ -50,7 +50,8 @@ paths:
               schema:
                 $ref: '#/components/schemas/_foo_get_default_response'
           description: response
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /pet:
     post:
       description: ""
@@ -69,7 +70,8 @@ paths:
       tags:
       - pet
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     put:
       description: ""
       operationId: updatePet
@@ -91,7 +93,8 @@ paths:
       tags:
       - pet
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     servers:
     - url: http://petstore.swagger.io/v2
     - url: http://path-server-test.petstore.local/v2
@@ -140,7 +143,9 @@ paths:
       summary: Finds Pets by status
       tags:
       - pet
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
   /pet/findByTags:
     get:
       deprecated: true
@@ -182,7 +187,9 @@ paths:
       summary: Finds Pets by tags
       tags:
       - pet
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
   /pet/{petId}:
     delete:
       description: ""
@@ -214,7 +221,8 @@ paths:
       summary: Deletes a pet
       tags:
       - pet
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     get:
       description: Returns a single pet
       operationId: getPetById
@@ -247,7 +255,9 @@ paths:
       summary: Find pet by ID
       tags:
       - pet
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
     post:
       description: ""
       operationId: updatePetWithForm
@@ -277,7 +287,8 @@ paths:
       tags:
       - pet
       x-content-type: application/x-www-form-urlencoded
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /pet/{petId}/uploadImage:
     post:
       description: ""
@@ -312,7 +323,8 @@ paths:
       tags:
       - pet
       x-content-type: multipart/form-data
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /store/inventory:
     get:
       description: Returns a map of status codes to quantities
@@ -332,7 +344,8 @@ paths:
       summary: Returns pet inventories by status
       tags:
       - store
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /store/order:
     post:
       description: ""
@@ -360,7 +373,9 @@ paths:
       tags:
       - store
       x-content-type: application/json
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
   /store/order/{order_id}:
     delete:
       description: For valid response try integer IDs with value < 1000. Anything
@@ -383,7 +398,8 @@ paths:
       summary: Delete purchase order by ID
       tags:
       - store
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     get:
       description: For valid response try integer IDs with value <= 5 or > 10. Other
         values will generate exceptions
@@ -417,7 +433,9 @@ paths:
       summary: Find purchase order by ID
       tags:
       - store
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
   /user:
     post:
       description: This can only be done by the logged in user.
@@ -436,7 +454,8 @@ paths:
       tags:
       - user
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /user/createWithArray:
     post:
       description: ""
@@ -450,7 +469,8 @@ paths:
       tags:
       - user
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /user/createWithList:
     post:
       description: ""
@@ -464,7 +484,8 @@ paths:
       tags:
       - user
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /user/login:
     get:
       description: ""
@@ -516,7 +537,9 @@ paths:
       summary: Logs user into the system
       tags:
       - user
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
   /user/logout:
     get:
       description: ""
@@ -527,7 +550,8 @@ paths:
       summary: Logs out current logged in user session
       tags:
       - user
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /user/{username}:
     delete:
       description: This can only be done by the logged in user.
@@ -549,7 +573,8 @@ paths:
       summary: Delete user
       tags:
       - user
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     get:
       description: ""
       operationId: getUserByName
@@ -579,7 +604,9 @@ paths:
       summary: Get user by user name
       tags:
       - user
-      x-accepts: "application/json,application/xml"
+      x-accepts:
+      - application/json
+      - application/xml
     put:
       description: This can only be done by the logged in user.
       operationId: updateUser
@@ -608,7 +635,8 @@ paths:
       tags:
       - user
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake_classname_test:
     patch:
       description: To test class name in snake case
@@ -628,7 +656,8 @@ paths:
       tags:
       - fake_classname_tags 123#$%^
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake:
     delete:
       description: Fake endpoint to test group parameters (optional)
@@ -693,7 +722,8 @@ paths:
       tags:
       - fake
       x-group-parameters: true
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     get:
       description: To test enum parameters
       operationId: testEnumParameters
@@ -790,7 +820,8 @@ paths:
       tags:
       - fake
       x-content-type: application/x-www-form-urlencoded
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     patch:
       description: To test "client" model
       operationId: testClientModel
@@ -807,7 +838,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
     post:
       description: |
         Fake endpoint for testing various parameters
@@ -835,7 +867,8 @@ paths:
       tags:
       - fake
       x-content-type: application/x-www-form-urlencoded
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/outer/number:
     post:
       description: Test serialization of outer number types
@@ -856,7 +889,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: '*/*'
+      x-accepts:
+      - '*/*'
   /fake/outer/string:
     post:
       description: Test serialization of outer string types
@@ -877,7 +911,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: '*/*'
+      x-accepts:
+      - '*/*'
   /fake/outer/boolean:
     post:
       description: Test serialization of outer boolean types
@@ -898,7 +933,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: '*/*'
+      x-accepts:
+      - '*/*'
   /fake/outer/composite:
     post:
       description: Test serialization of object with outer number type
@@ -919,7 +955,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: '*/*'
+      x-accepts:
+      - '*/*'
   /fake/BigDecimalMap:
     get:
       description: "for Java apache and Java native, test toUrlQueryString for maps\
@@ -934,7 +971,8 @@ paths:
           description: successful operation
       tags:
       - fake
-      x-accepts: '*/*'
+      x-accepts:
+      - '*/*'
   /fake/jsonFormData:
     get:
       description: ""
@@ -951,7 +989,8 @@ paths:
       tags:
       - fake
       x-content-type: application/x-www-form-urlencoded
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/additionalProperties-reference:
     post:
       description: ""
@@ -970,7 +1009,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/stringMap-reference:
     post:
       description: ""
@@ -989,7 +1029,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/inline-additionalProperties:
     post:
       description: ""
@@ -1010,7 +1051,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/inline-freeform-additionalProperties:
     post:
       description: ""
@@ -1029,7 +1071,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/body-with-query-params:
     put:
       operationId: testBodyWithQueryParams
@@ -1053,7 +1096,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /another-fake/dummy:
     patch:
       description: To test special tags and operation ID starting with number
@@ -1071,7 +1115,8 @@ paths:
       tags:
       - $another-fake?
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/body-with-file-schema:
     put:
       description: "For this test, the body for this request much reference a schema\
@@ -1089,7 +1134,8 @@ paths:
       tags:
       - fake
       x-content-type: application/json
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/test-query-parameters:
     put:
       description: To test the collection format in query parameters
@@ -1145,7 +1191,8 @@ paths:
           description: Success
       tags:
       - fake
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/{petId}/uploadImageWithRequiredFile:
     post:
       description: ""
@@ -1180,7 +1227,8 @@ paths:
       tags:
       - pet
       x-content-type: multipart/form-data
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/health:
     get:
       responses:
@@ -1193,7 +1241,8 @@ paths:
       summary: Health check endpoint
       tags:
       - fake
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/array-of-enums:
     get:
       operationId: getArrayOfEnums
@@ -1207,7 +1256,8 @@ paths:
       summary: Array of Enums
       tags:
       - fake
-      x-accepts: application/json
+      x-accepts:
+      - application/json
   /fake/application_json_utf8:
     get:
       operationId: get_application_json_utf8
@@ -1221,7 +1271,8 @@ paths:
       summary: application/json UTF8
       tags:
       - fake
-      x-accepts: application/json;charset=utf-8
+      x-accepts:
+      - application/json;charset=utf-8
 components:
   requestBodies:
     UserArray: