Explicitly render useWrapping = true to @JacksonXmlElementWrapper

This was slightly inspired by @jzrebiec via PR OpenAPITools#5371.

Wrapping is the default since Jackson 2.1 – so explicitly rendering
this will:
- make generated model work out-of-the-box in Jackson 2.0 for instance
- ensure the models still work if the local `XmlWrapper` was
  configured with `useXmlWrapper(false)`

Author: Philzen

modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache

@@ -236,7 +236,7 @@ public class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}{{^parent}}
   {{#withXml}}
   @JacksonXmlProperty(localName = "{{items.xmlName}}{{^items.xmlName}}{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}{{/items.xmlName}}"{{#isXmlAttribute}}, isAttribute = true{{/isXmlAttribute}}{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}})
     {{#isContainer}}
-  @JacksonXmlElementWrapper({{#isXmlWrapped}}localName = "{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}"{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}}{{/isXmlWrapped}}{{^isXmlWrapped}}useWrapping = false{{/isXmlWrapped}})
+  @JacksonXmlElementWrapper({{#isXmlWrapped}}localName = "{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}", {{#xmlNamespace}}namespace = "{{.}}", {{/xmlNamespace}}{{/isXmlWrapped}}useWrapping = {{isXmlWrapped}})
     {{/isContainer}}
   {{/withXml}}
   {{/jackson}}

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

@@ -4876,7 +4876,7 @@ public void shouldGenerateOptionalParameterTypesWhenUsingOptionalAndDelegate_iss
             .containsWithNameAndAttributes("XmlElement", Map.of("name", "\"Tag\""))
             .containsWithNameAndAttributes("XmlElementWrapper", Map.of("name", "\"TagList\""))
             .containsWithNameAndAttributes("JacksonXmlProperty", Map.of("localName", "\"Tag\""))
-            .containsWithNameAndAttributes("JacksonXmlElementWrapper", Map.of("localName", "\"TagList\""))
+            .containsWithNameAndAttributes("JacksonXmlElementWrapper", Map.of("localName", "\"TagList\"", "useWrapping", "true"))
             .toMethod().toFileAssert()
 
             // ↓ custom internal xml-array element name, non-wrapped (1st example in https://spec.openapis.org/oas/v3.0.0#xml-arrays)
@@ -4904,7 +4904,7 @@ public void shouldGenerateOptionalParameterTypesWhenUsingOptionalAndDelegate_iss
             .containsWithNameAndAttributes("XmlElement", Map.of("name", "\"photoUrls\""))
             .containsWithNameAndAttributes("XmlElementWrapper", Map.of("name", "\"photoUrls\""))
             .containsWithNameAndAttributes("JacksonXmlProperty", Map.of("localName", "\"photoUrls\""))
-            .containsWithNameAndAttributes("JacksonXmlElementWrapper", Map.of("localName", "\"photoUrls\""))
+            .containsWithNameAndAttributes("JacksonXmlElementWrapper", Map.of("localName", "\"photoUrls\"", "useWrapping", "true"))
             .toMethod().toFileAssert()
 
             // ↓ test attribute generation (https://swagger.io/docs/specification/data-models/representing-xml/#:~:text=Convert%20Property%20to%20an%20Attribute)

samples/openapi3/server/petstore/springboot-3/src/main/java/org/openapitools/model/Pet.java

@@ -199,7 +199,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
   @Schema(name = "photoUrls", requiredMode = Schema.RequiredMode.REQUIRED)
   @JsonProperty("photoUrls")
   @JacksonXmlProperty(localName = "photoUrl")
-  @JacksonXmlElementWrapper(localName = "photoUrls")
+  @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
   @XmlElement(name = "photoUrl")
   @XmlElementWrapper(name = "photoUrls")
   public List<String> getPhotoUrls() {
@@ -231,7 +231,7 @@ public Pet addTagsItem(Tag tagsItem) {
   @Schema(name = "tags", requiredMode = Schema.RequiredMode.NOT_REQUIRED)
   @JsonProperty("tags")
   @JacksonXmlProperty(localName = "Tag")
-  @JacksonXmlElementWrapper(localName = "tag")
+  @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
   @XmlElement(name = "Tag")
   @XmlElementWrapper(name = "tag")
   public List<@Valid Tag> getTags() {

samples/server/petstore/java-camel/src/main/java/org/openapitools/model/Pet.java

@@ -188,7 +188,7 @@ public Pet addPhotoUrlsItem(String photoUrlsItem) {
   @Schema(name = "photoUrls", requiredMode = Schema.RequiredMode.REQUIRED)
   @JsonProperty("photoUrls")
   @JacksonXmlProperty(localName = "photoUrl")
-  @JacksonXmlElementWrapper(localName = "photoUrls")
+  @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
   @XmlElement(name = "photoUrl")
   @XmlElementWrapper(name = "photoUrls")
   public List<String> getPhotoUrls() {
@@ -220,7 +220,7 @@ public Pet addTagsItem(Tag tagsItem) {
   @Schema(name = "tags", requiredMode = Schema.RequiredMode.NOT_REQUIRED)
   @JsonProperty("tags")
   @JacksonXmlProperty(localName = "Tag")
-  @JacksonXmlElementWrapper(localName = "tag")
+  @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
   @XmlElement(name = "Tag")
   @XmlElementWrapper(name = "tag")
   public List<@Valid Tag> getTags() {