Defensive check for cglib proxy in RequestMappingEndpoint

Since AbstractHandlerMethodMapping.getHandlerMap() is final it can't
be cglibbed and a proxy will barf if you try and call that method.
The RequestMappingEndpoint can be protected simply by defensively
checking if the mapping is a proxy before trying to inspect it.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/RequestMappingEndpoint.java

@@ -23,6 +23,7 @@
 import java.util.List;
 import java.util.Map;
 
+import org.springframework.aop.support.AopUtils;
 import org.springframework.beans.BeansException;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.ApplicationContext;
@@ -109,6 +110,10 @@ protected void extractHandlerMappings(ApplicationContext applicationContext,
 					.getBeansOfType(AbstractUrlHandlerMapping.class);
 			for (String name : mappings.keySet()) {
 				AbstractUrlHandlerMapping mapping = mappings.get(name);
+				if (AopUtils.isCglibProxy(mapping)) {
+					// The getHandlerMap() method is final so it cannot be cglibbed
+					continue;
+				}
 				Map<String, Object> handlers = mapping.getHandlerMap();
 				for (String key : handlers.keySet()) {
 					result.put(key, Collections.singletonMap("bean", name));

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/RequestMappingEndpointTests.java

@@ -23,6 +23,12 @@
 import org.junit.Test;
 import org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping;
 import org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.context.annotation.Scope;
+import org.springframework.context.annotation.ScopedProxyMode;
 import org.springframework.context.support.StaticApplicationContext;
 import org.springframework.web.servlet.handler.AbstractHandlerMethodMapping;
 import org.springframework.web.servlet.handler.AbstractUrlHandlerMapping;
@@ -69,6 +75,18 @@ public void beanUrlMappings() {
 		assertEquals("mapping", map.get("bean"));
 	}
 
+	@Test
+	public void beanUrlMappingsProxy() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				MappingConfiguration.class);
+		this.endpoint.setApplicationContext(context);
+		Map<String, Object> result = this.endpoint.invoke();
+		assertEquals(1, result.size());
+		@SuppressWarnings("unchecked")
+		Map<String, Object> map = (Map<String, Object>) result.get("/foo");
+		assertEquals("scopedTarget.mapping", map.get("bean"));
+	}
+
 	@Test
 	public void beanMethodMappings() {
 		StaticApplicationContext context = new StaticApplicationContext();
@@ -104,4 +122,15 @@ public void concreteMethodMappings() {
 		assertTrue(handler.containsKey("method"));
 	}
 
+	@Configuration
+	protected static class MappingConfiguration {
+		@Bean
+		@Lazy
+		@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
+		public AbstractUrlHandlerMapping mapping() {
+			SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
+			mapping.setUrlMap(Collections.singletonMap("/foo", new Object()));
+			return mapping;
+		}
+	}
 }