fix #782

spring-cloud-alibaba-sentinel/src/main/java/com/alibaba/cloud/sentinel/feign/SentinelInvocationHandler.java

@@ -94,8 +94,12 @@ public class SentinelInvocationHandler implements InvocationHandler {
 					.get(hardCodedTarget.type().getName()
 							+ Feign.configKey(hardCodedTarget.type(), method));
 			// resource default is HttpMethod:protocol://url
-			String resourceName = methodMetadata.template().method().toUpperCase() + ":"
-					+ hardCodedTarget.url() + methodMetadata.template().path();
+			if (methodMetadata == null) {
+				result = methodHandler.invoke(args);
+			}
+			else {
+				String resourceName = methodMetadata.template().method().toUpperCase()
+						+ ":" + hardCodedTarget.url() + methodMetadata.template().path();
 				Entry entry = null;
 				try {
 					ContextUtil.enter(resourceName);
@@ -114,7 +118,8 @@ public class SentinelInvocationHandler implements InvocationHandler {
 							return fallbackResult;
 						}
 						catch (IllegalAccessException e) {
-						// shouldn't happen as method is public due to being an interface
+							// shouldn't happen as method is public due to being an
+							// interface
 							throw new AssertionError(e);
 						}
 						catch (InvocationTargetException e) {
@@ -133,6 +138,7 @@ public class SentinelInvocationHandler implements InvocationHandler {
 					ContextUtil.exit();
 				}
 			}
+		}
 		else {
 			// other target type using default strategy
 			result = methodHandler.invoke(args);