Generated OuterClass has a lot of incompatibilities !

[smal...@gmail.com]

Hi , I am new to gRPC / protobuf.

This is my first .proto file :

syntax = "proto3";
option java_package = "destiny.identity.services.grpc";

service EchoService {
    rpc echo (EchoRequest) returns (EchoReply) {}
}

message EchoRequest {
    string name=1;
}

message EchoReply {
    string message = 1;
}

It is simple , but the generated EchoServiceOuterClass.java has a lot of incompatibilities :

~/destiny-identity/target/generated-sources/protobuf/java/destiny/identity/services/grpc/EchoServiceOuterClass.java

Error:(83, 13) java: incompatible types: java.io.IOException cannot be converted to java.lang.String

Error:(152, 18) java: memoizedSize has private access in com.google.protobuf.AbstractMessage

Error:(159, 7) java: memoizedSize has private access in com.google.protobuf.AbstractMessage

Error:(394, 18) java: cannot find symbol

  symbol:   method unwrapIOException()

  location: variable e of type com.google.protobuf.InvalidProtocolBufferException

Error:(586, 13) java: incompatible types: java.io.IOException cannot be converted to java.lang.String

Error:(655, 18) java: memoizedSize has private access in com.google.protobuf.AbstractMessage

Error:(662, 7) java: memoizedSize has private access in com.google.protobuf.AbstractMessage

Error:(897, 18) java: cannot find symbol

  symbol:   method unwrapIOException()

  location: variable e of type com.google.protobuf.InvalidProtocolBufferException

This is my [ partial ] pom.xml

<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:${os.detected.classifier}</protocArtifact>
    <pluginId>grpc-java</pluginId>
    <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.0.0:exe:${os.detected.classifier}</pluginArtifact>
  </configuration>
  <executions>
    <execution>
      <goals>
        <goal>compile</goal>
        <goal>compile-custom</goal>
      </goals>
    </execution>
  </executions>
</plugin>

The grpc-netty , grpc-protobuf , grpc-stub are all of version of 1.0.0

Where goes wrong here ?

Thanks.

[Eric Anderson]

This was resolved in https://github.com/grpc/grpc-java/issues/2300. There was an older protobuf getting included in the application, which was causing trouble.