diff --git a/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java b/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
index 9763131..373c48f 100644
--- a/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
+++ b/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
@@ -10,12 +10,10 @@ import org.springframework.grpc.server.GlobalServerInterceptor;
 import org.springframework.grpc.server.security.AuthenticationProcessInterceptor;
 import org.springframework.grpc.server.security.GrpcSecurity;
 import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
-import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
 
 import io.grpc.Metadata;
 
 @SpringBootApplication
-@EnableMethodSecurity
 @Import(AuthenticationConfiguration.class)
 public class GrpcServerApplication {
 
diff --git a/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerService.java b/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerService.java
index 3f8eb8f..375a101 100644
--- a/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerService.java
+++ b/samples/grpc-oauth2/src/main/java/org/springframework/grpc/sample/GrpcServerService.java
@@ -15,7 +15,6 @@ public class GrpcServerService extends SimpleGrpc.SimpleImplBase {
 	private static Log log = LogFactory.getLog(GrpcServerService.class);
 
 	@Override
-	// @PreAuthorize("hasAuthority('ROLE_USER')")
 	public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
 		log.info("Hello " + req.getName());
 		if (req.getName().startsWith("error")) {
@@ -27,7 +26,6 @@ public class GrpcServerService extends SimpleGrpc.SimpleImplBase {
 	}
 
 	@Override
-	// @PreAuthorize("hasAuthority('ROLE_ADMIN')")
 	public void streamHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
 		log.info("Hello " + req.getName());
 		int count = 0;
diff --git a/samples/grpc-tomcat/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java b/samples/grpc-tomcat/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
index dd4b557..383ed22 100644
--- a/samples/grpc-tomcat/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
+++ b/samples/grpc-tomcat/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java
@@ -1,7 +1,5 @@
 package org.springframework.grpc.sample;
 
-import java.util.Arrays;
-
 import org.apache.coyote.UpgradeProtocol;
 import org.apache.coyote.http2.Http2Protocol;
 import org.springframework.boot.SpringApplication;
@@ -9,8 +7,6 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
 import org.springframework.context.annotation.Bean;
 
-import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
-
 @SpringBootApplication
 public class GrpcServerApplication {