fixup! Create spring-boot-validation module

Author: wilkinsona

spring-boot-project/spring-boot-autoconfigure-all/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.java

@@ -528,7 +528,9 @@ public FormattingConversionService mvcConversionService() {
 		@Bean
 		@Override
 		public Validator mvcValidator() {
-			if (!ClassUtils.isPresent("jakarta.validation.Validator", getClass().getClassLoader())) {
+			if (!ClassUtils.isPresent("jakarta.validation.Validator", getClass().getClassLoader())
+					|| !ClassUtils.isPresent("org.springframework.boot.validation.autoconfigure.ValidatorAdapter",
+							getClass().getClassLoader())) {
 				return super.mvcValidator();
 			}
 			return ValidatorAdapter.get(getApplicationContext(), getValidator());