fix(kotlin-spring): declare springdoc version property regardless of useSwaggerUI

The springdoc-openapi.version Maven property was only declared when
useSwaggerUI=true, but the springdoc core dependency (used when
useSwaggerUI=false) also references it, causing an undefined property.

Author: yonatankarp

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/pom-sb4.mustache

@@ -6,8 +6,8 @@
     <name>{{artifactId}}</name>
     <version>{{artifactVersion}}</version>
     <properties>{{#reactive}}
-        <kotlinx-coroutines.version>1.10.1</kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}{{#useSwaggerUI}}
-        <springdoc-openapi.version>2.8.6</springdoc-openapi.version>{{/useSwaggerUI}}{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
+        <kotlinx-coroutines.version>1.10.1</kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}
+        <springdoc-openapi.version>2.8.6</springdoc-openapi.version>{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
         <swagger-ui.version>5.17.14</swagger-ui.version>{{/springDocDocumentationProvider}}{{/useSwaggerUI}}{{^springDocDocumentationProvider}}{{#swagger1AnnotationLibrary}}
         <swagger-annotations.version>1.6.6</swagger-annotations.version>{{/swagger1AnnotationLibrary}}{{#swagger2AnnotationLibrary}}
         <swagger-annotations.version>2.2.28</swagger-annotations.version>{{/swagger2AnnotationLibrary}}{{/springDocDocumentationProvider}}

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/pom-sb4.mustache

@@ -8,9 +8,9 @@
     <version>{{artifactVersion}}</version>
     <properties>{{#reactive}}
         <kotlinx-coroutines.version>1.10.1
-        </kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}{{#useSwaggerUI}}
+        </kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}
         <springdoc-openapi.version>2.8.6
-        </springdoc-openapi.version>{{/useSwaggerUI}}{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
+        </springdoc-openapi.version>{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
         <swagger-ui.version>5.17.14
         </swagger-ui.version>{{/springDocDocumentationProvider}}{{/useSwaggerUI}}{{^springDocDocumentationProvider}}{{#swagger1AnnotationLibrary}}
         <swagger-annotations.version>1.6.6

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-declarative-http-interface/pom-sb4.mustache

@@ -8,9 +8,9 @@
     <version>{{artifactVersion}}</version>
     <properties>{{#reactive}}
         <kotlinx-coroutines.version>1.10.1
-        </kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}{{#useSwaggerUI}}
+        </kotlinx-coroutines.version>{{/reactive}}{{#springDocDocumentationProvider}}
         <springdoc-openapi.version>2.8.6
-        </springdoc-openapi.version>{{/useSwaggerUI}}{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
+        </springdoc-openapi.version>{{/springDocDocumentationProvider}}{{#useSwaggerUI}}{{^springDocDocumentationProvider}}
         <swagger-ui.version>5.17.14
         </swagger-ui.version>{{/springDocDocumentationProvider}}{{/useSwaggerUI}}{{^springDocDocumentationProvider}}{{#swagger1AnnotationLibrary}}
         <swagger-annotations.version>1.6.6

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

@@ -22,6 +22,7 @@
 import org.openapitools.codegen.languages.features.DocumentationProviderFeatures;
 import org.openapitools.codegen.languages.features.DocumentationProviderFeatures.AnnotationLibrary;
 import org.openapitools.codegen.languages.features.DocumentationProviderFeatures.DocumentationProvider;
+import org.openapitools.codegen.languages.features.SwaggerUIFeatures;
 import org.testng.Assert;
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
@@ -4935,6 +4936,37 @@ public void shouldDefaultToJackson3WhenSpringBoot4Enabled() throws IOException {
         assertFileNotContains(pomPath, "com.fasterxml.jackson.module");
         assertFileNotContains(pomPath, "jackson-datatype-jsr310");
     }
+
+    @Test
+    public void shouldDeclareSpringdocVersionWhenSwaggerUIDisabled() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/petstore.yaml");
+        final KotlinSpringServerCodegen codegen = new KotlinSpringServerCodegen();
+        codegen.setOpenAPI(openAPI);
+        codegen.setOutputDir(output.getAbsolutePath());
+
+        codegen.additionalProperties().put(KotlinSpringServerCodegen.USE_SPRING_BOOT4, "true");
+        codegen.additionalProperties().put(DOCUMENTATION_PROVIDER, DocumentationProvider.SPRINGDOC.toCliOptValue());
+        codegen.additionalProperties().put(SwaggerUIFeatures.USE_SWAGGER_UI, false);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGenerateMetadata(false);
+        generator.opts(input).generate();
+
+        Path pomPath = Paths.get(outputPath + "/pom.xml");
+        String pomContent = new String(Files.readAllBytes(pomPath), StandardCharsets.UTF_8);
+        String propertiesBlock = pomContent.substring(
+                pomContent.indexOf("<properties>"),
+                pomContent.indexOf("</properties>"));
+        assertThat(propertiesBlock).contains("<springdoc-openapi.version>");
+    }
 }