Prevent accidental failure of deployed war when management.port is set

We can't support (yet) embedded containers inside a deployed war (class
loader conflicts are inevitable, really). Until we figure out a way to
do it, we should just log a warning and advise the user to switch to
JMX for the actuator endpoints.

See gh-552

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcAutoConfiguration.java

@@ -25,6 +25,8 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
@@ -50,6 +52,7 @@ import org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoCo
 import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext;
+import org.springframework.boot.context.embedded.EmbeddedServletContainerException;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.context.ApplicationListener;
@@ -81,6 +84,8 @@ import org.springframework.web.servlet.DispatcherServlet;
 public class EndpointWebMvcAutoConfiguration implements ApplicationContextAware,
 		ApplicationListener<ContextRefreshedEvent> {
 
+	private static Log logger = LogFactory.getLog(EndpointWebMvcAutoConfiguration.class);
+
 	private ApplicationContext applicationContext;
 
 	@Autowired
@@ -184,7 +189,20 @@ public class EndpointWebMvcAutoConfiguration implements ApplicationContextAware,
 						}
 					});
 		}
-		childContext.refresh();
+		try {
+			childContext.refresh();
+		}
+		catch (RuntimeException e) {
+			// No support currently for deploying a war with management.port=<different>,
+			// and this is the signature of that happening
+			if (e instanceof EmbeddedServletContainerException
+					|| e.getCause() instanceof EmbeddedServletContainerException) {
+				logger.warn("Could not start embedded container (management endpoints are still available through JMX)");
+			}
+			else {
+				throw e;
+			}
+		}
 	}
 
 	protected static enum ManagementServerPort {