Do not auto-configure ViewResolver if spring-webmvc is absent

See gh-44259

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,6 +56,7 @@
 import org.springframework.util.MimeType;
 import org.springframework.util.unit.DataSize;
 import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
+import org.springframework.web.servlet.view.AbstractCachingViewResolver;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Thymeleaf.
@@ -142,6 +143,7 @@ FilterRegistrationBean<ResourceUrlEncodingFilter> resourceUrlEncodingFilter() {
 		}
 
 		@Configuration(proxyBeanMethods = false)
+		@ConditionalOnClass(AbstractCachingViewResolver.class)
 		static class ThymeleafViewResolverConfiguration {
 
 			@Bean

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafServletAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -46,6 +46,7 @@
 import org.springframework.boot.test.system.CapturedOutput;
 import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.boot.testsupport.BuildOutput;
+import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.filter.OrderedCharacterEncodingFilter;
 import org.springframework.context.annotation.Bean;
@@ -336,6 +337,13 @@ void cachingCanBeDisabled() {
 		});
 	}
 
+	@Test
+	@ClassPathExclusions("spring-webmvc-*.jar")
+	void missingAbstractCachingViewResolver() {
+		this.contextRunner
+			.run((context) -> assertThat(context).hasNotFailed().doesNotHaveBean("thymeleafViewResolver"));
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class LayoutDialectConfiguration {