[BUGFIX][kotlin-spring] Fix generatedAnnotation to use the javaxPackage variable instead of jakarta to fix spring boot 2 codegen (#15944)

* Update generatedAnnotation.mustache

Without this, it generates a jakarta annotation in the controllers of a spring boot 2 project.

* Updated examples

modules/openapi-generator/src/main/resources/kotlin-spring/generatedAnnotation.mustache

@@ -1 +1 @@
-@jakarta.annotation.Generated(value = ["{{generatorClass}}"]{{^hideGenerationTimestamp}}, date = "{{generatedDate}}"{{/hideGenerationTimestamp}})
+@{{javaxPackage}}.annotation.Generated(value = ["{{generatorClass}}"]{{^hideGenerationTimestamp}}, date = "{{generatedDate}}"{{/hideGenerationTimestamp}})

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/SpringDocConfiguration.kt

@@ -10,7 +10,8 @@ import io.swagger.v3.oas.models.info.License
 import io.swagger.v3.oas.models.Components
 import io.swagger.v3.oas.models.security.SecurityScheme
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Configuration
 class SpringDocConfiguration {
 

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -4,7 +4,8 @@ import org.springframework.stereotype.Controller
 import org.springframework.web.bind.annotation.RequestMapping
 import java.util.Optional
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Controller
 @RequestMapping("\${openapi.openAPIPetstore.base-path:/v2}")
 class PetApiController(

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt

@@ -14,7 +14,8 @@ import java.util.Optional
  * A delegate to be called by the {@link PetApiController}}.
  * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
  */
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 interface PetApiDelegate {
 
     fun getRequest(): Optional<NativeWebRequest> = Optional.empty()

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/StoreApiController.kt

@@ -4,7 +4,8 @@ import org.springframework.stereotype.Controller
 import org.springframework.web.bind.annotation.RequestMapping
 import java.util.Optional
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Controller
 @RequestMapping("\${openapi.openAPIPetstore.base-path:/v2}")
 class StoreApiController(

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/StoreApiDelegate.kt

@@ -13,7 +13,8 @@ import java.util.Optional
  * A delegate to be called by the {@link StoreApiController}}.
  * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
  */
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 interface StoreApiDelegate {
 
     fun getRequest(): Optional<NativeWebRequest> = Optional.empty()

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/UserApiController.kt

@@ -4,7 +4,8 @@ import org.springframework.stereotype.Controller
 import org.springframework.web.bind.annotation.RequestMapping
 import java.util.Optional
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Controller
 @RequestMapping("\${openapi.openAPIPetstore.base-path:/v2}")
 class UserApiController(

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/UserApiDelegate.kt

@@ -13,7 +13,8 @@ import java.util.Optional
  * A delegate to be called by the {@link UserApiController}}.
  * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
  */
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 interface UserApiDelegate {
 
     fun getRequest(): Optional<NativeWebRequest> = Optional.empty()

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/SpringDocConfiguration.kt

@@ -10,7 +10,8 @@ import io.swagger.v3.oas.models.info.License
 import io.swagger.v3.oas.models.Components
 import io.swagger.v3.oas.models.security.SecurityScheme
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Configuration
 class SpringDocConfiguration {
 

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/SpringFoxConfiguration.kt

@@ -16,7 +16,8 @@ import springfox.documentation.swagger2.annotations.EnableSwagger2
 import javax.servlet.ServletContext
 
 
-@jakarta.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+@javax.annotation.Generated(value = ["org.openapitools.codegen.languages.KotlinSpringServerCodegen"])
+
 @Configuration
 @EnableSwagger2
 class SpringFoxConfiguration {