[grS protobuf java中的NoSuchMethod和NClassDefFound

问题描述 投票：0回答：1

我有一个启动的gRPC服务，一切正常，没有错误。但是，当我尝试使用将要读取并用于该服务的grpcui（./grpcui -plaintext localhost:9900）时，会得到以下信息：

Exception in thread "grpc-default-executor-0" java.lang.NoSuchMethodError: com.google.protobuf.Descriptors$FileDescriptor.internalBuildGeneratedFileFrom([Ljava/lang/String;[Lcom/google/protobuf/Descriptors$FileDescriptor;)Lcom/google/protobuf/Descriptors$FileDescriptor;
    at io.grpc.reflection.v1alpha.ServerReflectionProto.<clinit>(ServerReflectionProto.java:103)
    at io.grpc.reflection.v1alpha.ServerReflectionGrpc$ServerReflectionBaseDescriptorSupplier.getFileDescriptor(ServerReflectionGrpc.java:234)
    at io.grpc.protobuf.services.ProtoReflectionService$FileDescriptorIndex.<init>(ProtoReflectionService.java:418)
    at io.grpc.protobuf.services.ProtoReflectionService$ServerReflectionIndex.<init>(ProtoReflectionService.java:339)
    at io.grpc.protobuf.services.ProtoReflectionService.updateIndexIfNecessary(ProtoReflectionService.java:97)
    at io.grpc.protobuf.services.ProtoReflectionService.serverReflectionInfo(ProtoReflectionService.java:136)
    at io.grpc.reflection.v1alpha.ServerReflectionGrpc$MethodHandlers.invoke(ServerReflectionGrpc.java:220)
    at io.grpc.stub.ServerCalls$StreamingServerCallHandler.startCall(ServerCalls.java:224)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.startWrappedCall(ServerImpl.java:648)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.startCall(ServerImpl.java:626)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.access$1900(ServerImpl.java:417)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl$1StreamCreated.runInternal(ServerImpl.java:556)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl$1StreamCreated.runInContext(ServerImpl.java:531)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

和

Exception in thread "grpc-default-executor-1" java.lang.NoClassDefFoundError: Could not initialize class io.grpc.reflection.v1alpha.ServerReflectionProto
    at io.grpc.reflection.v1alpha.ServerReflectionGrpc$ServerReflectionBaseDescriptorSupplier.getFileDescriptor(ServerReflectionGrpc.java:234)
    at io.grpc.protobuf.services.ProtoReflectionService$FileDescriptorIndex.<init>(ProtoReflectionService.java:418)
    at io.grpc.protobuf.services.ProtoReflectionService$ServerReflectionIndex.<init>(ProtoReflectionService.java:339)
    at io.grpc.protobuf.services.ProtoReflectionService.updateIndexIfNecessary(ProtoReflectionService.java:97)
    at io.grpc.protobuf.services.ProtoReflectionService.serverReflectionInfo(ProtoReflectionService.java:136)
    at io.grpc.reflection.v1alpha.ServerReflectionGrpc$MethodHandlers.invoke(ServerReflectionGrpc.java:220)
    at io.grpc.stub.ServerCalls$StreamingServerCallHandler.startCall(ServerCalls.java:224)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.startWrappedCall(ServerImpl.java:648)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.startCall(ServerImpl.java:626)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl.access$1900(ServerImpl.java:417)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl$1StreamCreated.runInternal(ServerImpl.java:556)
    at io.grpc.internal.ServerImpl$ServerTransportListenerImpl$1StreamCreated.runInContext(ServerImpl.java:531)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

我的服务：

public class OneSideInitiated extends SideGrpc.SideImplBase {

    @Override
    public void requestStart(RemoteStartRequest request,
                                        StreamObserver<RemoteStartResponse> responseObserver) {

        RemoteStartResponse response = RemoteStartResponse.newBuilder().build();

        responseObserver.onNext(response);
        responseObserver.onCompleted();
    }
}

启动服务的类：

import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.protobuf.services.ProtoReflectionService;

public class StuffServer {

    private Server server;

    public StuffServer(int port) {

        this.server = ServerBuilder.forPort(port)
                .addService(ProtoReflectionService.newInstance())
                .addService(new OneSideInitiated())
                .build();
    }

    public void start() throws IOException {
        server.start();
    }

    public void stop() throws InterruptedException {...}

    public static void main(String[] args) throws Exception {
        CccpServer cccpServer = new StuffServer(9900);
        cccpServer.start();
        cccpServer.blockUntilShutdown();
    }

    private void blockUntilShutdown() throws InterruptedException {...}
}

我的Maven依赖项是：

        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-stub</artifactId>
            <version>1.26.0</version>
        </dependency>

        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-core</artifactId>
            <version>1.26.0</version>
        </dependency>

        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty</artifactId>
            <version>1.26.0</version>
        </dependency>

        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-services</artifactId>
            <version>1.26.0</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>23.6.1-jre</version>
        </dependency>

        <dependency>
            <groupId>com.google.api.grpc</groupId>
            <artifactId>proto-google-common-protos</artifactId>
            <version>0.1.9</version>
        </dependency>

        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-testing</artifactId>
            <version>1.26.0</version>
            <scope>testing</scope>
        </dependency>

尝试过guava和io.grpc版本的不同组合，没有任何区别。有人对此有任何想法吗？

java protocol-buffers grpc noclassdeffounderror nosuchmethoderror
1个回答
0
投票

该特定FileDescriptor.internalBuildGeneratedFileFrom（）方法已在v3.8中添加到Protobuf。通常，NoSuchMethodError错误是导致依赖关系降级的原因，通常是Maven造成的。

您可以运行mvn dependency:tree来检查正在使用的依赖版本。在这种情况下，您会发现com.google.api.grpc:proto-google-common-protos:0.1.9取决于com.google.protobuf:protobuf-java:3.2.0，而这正是Maven使用的版本。

gRPC团队建议始终使用Maven Enforcer的requireUpperBoundDeps来检测Maven何时选择的版本不正确。您可以将其添加到pom.xml：

    <plugins>
      ...
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireUpperBoundDeps/>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>

[在构建期间检测到故障时，它将提供依赖于其他地方的版本。选择最大的版本，并将其作为显式依赖项添加到您的项目中：

    <dependency>
      <groupId>com.google.protobuf</groupId>
      <artifactId>protobuf-java</artifactId>
      <version>3.11.0</version>
    </dependency>

我还要注意，proto-google-common-protos：0.1.9很老了。我建议更新到最新版本，例如1.17.0。尽管您在1.17.0上仍然会遇到此问题。

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