[java][spring] Spring HTTP Interface library: Validate Spring Boot version (3 or 4) and fail early if unsupported

Author: Bragolgirith

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

@@ -327,7 +327,7 @@ public SpringCodegen() {
         supportedLibraries.put(SPRING_BOOT, "Spring-boot Server application.");
         supportedLibraries.put(SPRING_CLOUD_LIBRARY,
                 "Spring-Cloud-Feign client with Spring-Boot auto-configured settings.");
-        supportedLibraries.put(SPRING_HTTP_INTERFACE, "Spring 6 HTTP interfaces (testing)");
+        supportedLibraries.put(SPRING_HTTP_INTERFACE, "Spring 6 HTTP interfaces (testing). Requires Spring Boot 3 or 4.");
         setLibrary(SPRING_BOOT);
         final CliOption library = new CliOption(CodegenConstants.LIBRARY, CodegenConstants.LIBRARY_DESC)
                 .defaultValue(SPRING_BOOT);
@@ -644,6 +644,10 @@ public void processOpts() {
                     }
                 }
             } else if (SPRING_HTTP_INTERFACE.equals(library)) {
+                if (!(isUseSpringBoot3() || isUseSpringBoot4())) {
+                    throw new IllegalArgumentException("Library '" + SPRING_HTTP_INTERFACE + "' is only supported with Spring Boot 3 or 4");
+                }
+
                 String httpInterfacesAbstractConfiguratorFile = useHttpServiceProxyFactoryInterfacesConfigurator ?
                     "httpServiceProxyFactoryInterfacesConfigurator.mustache" :
                     "httpInterfacesConfiguration.mustache";

modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/README.mustache

@@ -1,6 +1,6 @@
 # OpenAPI generated API stub
 
-[Spring Framework 6.1 HTTP Interface](https://docs.spring.io/spring-framework/docs/6.1.0/reference/html/integration.html#rest-http-interface)
+[Spring Framework 6.1 HTTP Interface](https://docs.spring.io/spring-framework/reference/integration/rest-clients.html#rest-http-interface)
 
 
 ## Overview

…aries/spring-http-interface/pom.mustache …s/spring-http-interface/pom-sb3.mustachemodules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/pom.mustache renamed to modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/pom-sb3.mustache modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/pom.mustache renamed to modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/pom-sb3.mustache

@@ -6621,6 +6621,7 @@ public void shouldNotHaveDocumentationAnnotationWhenUsingLibrarySpringHttpInterf
         codegen.setOpenAPI(openAPI);
         codegen.setOutputDir(output.getAbsolutePath());
         codegen.setLibrary(SPRING_HTTP_INTERFACE);
+        codegen.setUseSpringBoot3(true);
         codegen.setAnnotationLibrary(AnnotationLibrary.SWAGGER2);
         codegen.setDocumentationProvider(DocumentationProvider.SPRINGDOC);