Honour custom bean name generator for non-web applications

Closes gh-6160

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -72,7 +72,6 @@ import org.springframework.util.ObjectUtils;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StopWatch;
 import org.springframework.util.StringUtils;
-import org.springframework.web.context.ConfigurableWebApplicationContext;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.context.support.StandardServletEnvironment;
 
@@ -603,15 +602,10 @@ public class SpringApplication {
 	 * @param context the application context
 	 */
 	protected void postProcessApplicationContext(ConfigurableApplicationContext context) {
-		if (this.webEnvironment) {
-			if (context instanceof ConfigurableWebApplicationContext) {
-				ConfigurableWebApplicationContext configurableContext = (ConfigurableWebApplicationContext) context;
-				if (this.beanNameGenerator != null) {
-					configurableContext.getBeanFactory().registerSingleton(
-							AnnotationConfigUtils.CONFIGURATION_BEAN_NAME_GENERATOR,
-							this.beanNameGenerator);
-				}
-			}
+		if (this.beanNameGenerator != null) {
+			context.getBeanFactory().registerSingleton(
+					AnnotationConfigUtils.CONFIGURATION_BEAN_NAME_GENERATOR,
+					this.beanNameGenerator);
 		}
 		if (this.resourceLoader != null) {
 			if (context instanceof GenericApplicationContext) {

spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java

@@ -53,6 +53,7 @@ import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigUtils;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.context.event.SimpleApplicationEventMulticaster;
@@ -403,6 +404,21 @@ public class SpringApplicationTests {
 				sameInstance((Object) beanNameGenerator));
 	}
 
+	@Test
+	public void customBeanNameGeneratorWithNonWebApplication() throws Exception {
+		TestSpringApplication application = new TestSpringApplication(
+				ExampleWebConfig.class);
+		application.setWebEnvironment(false);
+		BeanNameGenerator beanNameGenerator = new DefaultBeanNameGenerator();
+		application.setBeanNameGenerator(beanNameGenerator);
+		this.context = application.run();
+		verify(application.getLoader()).setBeanNameGenerator(beanNameGenerator);
+		assertThat(
+				this.context
+						.getBean(AnnotationConfigUtils.CONFIGURATION_BEAN_NAME_GENERATOR),
+				sameInstance((Object) beanNameGenerator));
+	}
+
 	@Test
 	public void commandLinePropertySource() throws Exception {
 		SpringApplication application = new SpringApplication(ExampleConfig.class);