grpcとprotobufを使用したio.netty.util.AttributeKey.valueOf（）メソッドのNoSuchMethodErrorを処理Hello world example

Question

GreetingServerTest.javaテストを実行した後、以下のエラーが発生しています。私はgrpc 1.1.0-SNAPSHOTライブラリを使用しており、そこに与えられたgrpcの基本的なHellowordの例を実装しようとしています。私が行方不明の図書館や何か他に必要なことがあれば教えてください。

java.lang.NoSuchMethodError: io.netty.util.AttributeKey.valueOf(Ljava/lang/Class;Ljava/lang/String;)Lio/netty/util/AttributeKey; 
at io.grpc.netty.Utils.<clinit>(Utils.java:87) 
at io.grpc.netty.NettyServer.allocateSharedGroups(NettyServer.java:187) 
at io.grpc.netty.NettyServer.start(NettyServer.java:116) 
at io.grpc.internal.ServerImpl.start(ServerImpl.java:156) 
at io.grpc.internal.ServerImpl.start(ServerImpl.java:83) 
at com.xyz.communication.datacollection.GrpcServerTest.test(GrpcServerTest.java:23) 

のpom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
<modelVersion>4.0.0</modelVersion> 
<groupId>org.springframework.samples</groupId> 
<artifactId>InternodeCommunication</artifactId> 
<version>0.0.1-SNAPSHOT</version> 

<properties> 
    <java.version>1.8</java.version> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 

    <!-- Spring --> 
    <spring-framework.version>4.3.1.RELEASE</spring-framework.version> 

    <!-- Logging --> 
    <logback.version>1.0.13</logback.version> 
    <slf4j.version>1.7.5</slf4j.version> 

    <!-- Kundera JPA --> 
    <kundera-version>3.4</kundera-version> 

    <!-- Hibernate jpa --> 
    <hibernate.version>4.2.1.Final</hibernate.version> 


    <!-- Test --> 
    <junit.version>4.12</junit.version> 
    <grpc.version>1.1.0-SNAPSHOT</grpc.version> 
    <!-- Generic properties --> 
</properties> 

<dependencies> 
    <!-- Spring and Transactions --> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-context</artifactId> 
     <version>${spring-framework.version}</version> 
    </dependency> 

    <!-- Hibernate --> 
    <dependency> 
     <groupId>org.hibernate</groupId> 
     <artifactId>hibernate-entitymanager</artifactId> 
     <version>${hibernate.version}</version> 
    </dependency> 
    <!-- kafka --> 
    <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka_2.10 --> 
    <dependency> 
     <groupId>org.apache.kafka</groupId> 
     <artifactId>kafka_2.10</artifactId> 
     <version>0.10.0.0</version> 
     <exclusions> 
      <exclusion> 
       <groupId>org.slf4j</groupId> 
       <artifactId>slf4j-log4j12</artifactId> 
      </exclusion> 
      <exclusion> 
       <groupId>log4j</groupId> 
       <artifactId>log4j</artifactId> 
      </exclusion> 
     </exclusions> 

    </dependency> 
    <dependency> 
     <groupId>com.xyz</groupId> 
     <artifactId>Common</artifactId> 
     <version>0.0.1-SNAPSHOT</version> 
    </dependency> 
    <dependency> 
     <groupId>com.google.guava</groupId> 
     <artifactId>guava</artifactId> 
     <version>18.0</version> 
    </dependency> 
    <dependency> 
     <groupId>io.netty</groupId> 
     <artifactId>netty-all</artifactId> 
     <version>4.1.5.Final</version> 
    </dependency> 
    <dependency> 
     <groupId>com.google.protobuf</groupId> 
     <artifactId>protobuf-java</artifactId> 
     <version>3.0.0</version> 
    </dependency> 
    <dependency> 
     <groupId>io.grpc</groupId> 
     <artifactId>grpc-netty</artifactId> 
     <version>${grpc.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>io.grpc</groupId> 
     <artifactId>grpc-protobuf</artifactId> 
     <version>${grpc.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>io.grpc</groupId> 
     <artifactId>grpc-stub</artifactId> 
     <version>${grpc.version}</version> 
    </dependency> 
    <!-- https://mvnrepository.com/artifact/io.grpc/grpc-all --> 
    <!-- https://mvnrepository.com/artifact/io.netty/netty-codec --> 
    <!-- https://mvnrepository.com/artifact/io.netty/netty-all --> 




    <!-- Test Artifacts --> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-test</artifactId> 
     <version>${spring-framework.version}</version> 
     <scope>test</scope> 
    </dependency> 
    <dependency> 
     <groupId>junit</groupId> 
     <artifactId>junit</artifactId> 
     <version>${junit.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>com.xyz</groupId> 
     <artifactId>Common</artifactId> 
     <version>0.0.1-SNAPSHOT</version> 
     <type>test-jar</type> 
     <scope>test</scope> 
    </dependency> 

</dependencies> 
<build> 
    <extensions> 
     <extension> 
      <groupId>kr.motd.maven</groupId> 
      <artifactId>os-maven-plugin</artifactId> 
      <version>1.4.1.Final</version> 
     </extension> 
    </extensions> 
    <plugins> 
     <plugin> 
      <groupId>org.xolstice.maven.plugins</groupId> 
      <artifactId>protobuf-maven-plugin</artifactId> 
      <version>0.5.0</version> 
      <configuration> 
       <!-- The version of protoc must match protobuf-java. If you don't depend 
        on protobuf-java directly, you will be transitively depending on the protobuf-java 
        version that grpc depends on. --> 
       <protocArtifact>com.google.protobuf:protoc:3.0.0:exe:${os.detected.classifier}</protocArtifact> 
       <pluginId>grpc-java</pluginId> 
       <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.1.0-SNAPSHOT:exe:${os.detected.classifier}</pluginArtifact> 
      </configuration> 
      <executions> 
       <execution> 
        <goals> 
         <goal>compile</goal> 
         <goal>compile-custom</goal> 
        </goals> 
       </execution> 
      </executions> 
     </plugin> 
    </plugins> 
</build> 

hello_world.protoファイル

syntax = "proto3"; 
option java_multiple_files = true; 
package com.xyz.communication.example; 
message HelloRequest { 
string name = 1; 
} 
message HelloResponse { 
    string greeting = 1; 
} 
service GreetingService { 
    rpc greeting(HelloRequest) returns (HelloResponse); 
} 

GreetingServerTest.java

@ContextConfiguration("/communication-test-beans.xml") 
@RunWith(SpringJUnit4ClassRunner.class) 
public class GrpcServerTest { 
    @Test 
    public void test() throws IOException, InterruptedException { 
     io.grpc.Server server = ServerBuilder.forPort(8080).addService(new GrpcServerImpl().bindService()).build(); 
     server.start(); 
     server.awaitTermination(); 
    } 
} 

class GrpcServerImpl extends GreetingServiceGrpc.GreetingServiceImplBase { 
    @Override 
    public void greeting(HelloRequest request, StreamObserver<HelloResponse> responseObserver) { 
     HelloResponse response = HelloResponse.newBuilder().setGreeting("Hello " + request.getName()).build(); 
     responseObserver.onNext(response); 
     responseObserver.onCompleted(); 
    } 

    @Override 
    public ServerServiceDefinition bindService() { 
     return super.bindService(); 
    } 
} 

Answer 1

実行時にクラスパスに複数のバージョンのnetty jarが存在する可能性があります。依存関係ツリーを確認するには、次のコマンドを使用します。

mvn dependency:tree -Dverbose 

または、あなたのアプリケーションでパッケージ化したjarのバージョンでNett Jarがクラッシュする可能性があります。

Answer 2

ここは私のために働いたものです。私はio.nettyとcom.googleを陰にする必要がありました。本当に助け

<relocation> 
 
     <pattern>io.netty</pattern> 
 
     <shadedPattern>myshade.io.netty</shadedPattern> 
 
    </relocation> 
 
    <relocation> 
 
     <pattern>com.google</pattern> 
 
     <shadedPattern>myshade.com.google</shadedPattern> 
 
    </relocation>