CODEWITHSUNDEEP
javagradleprotocol-buffers
oT2
oT2

Reputation: 73

Gradle doesn't find Google Protobuf package

I am trying to setup Google protobuf with netty, but when I start compilation gradle first download google protobuf (at least at the first attempt) but then at compilation it just tells me : 

  /src/main/java/GameMoveOuterClass.java:1536: error: package com.google.protobuf.GeneratedMessageV3 does not exist
com.google.protobuf.GeneratedMessageV3.FieldAccessorTable

here is my build.gradle :

apply plugin: 'java'
apply plugin: 'com.google.protobuf'

repositories {
    mavenCentral()
}

buildscript {
    repositories {
        mavenCentral()
   }
    dependencies {
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.0'
    }
}

dependencies {
    compile group: 'io.netty', name: 'netty-all', version: '4.1.5.Final'
    compile group: 'com.google.protobuf', name: 'protobuf-java', version: '2.4.1'
}


jar {
    manifest {
        attributes("Main-Class": 'server.Server',
        "Class-Path": configurations.compile.collect { it.getPath() }.join(' '))
    }
}

If someone knows what's wrong, please let me know Thanks

Upvotes: 4

Views: 10636

Answers (4)

alijandro
alijandro

Reputation: 12177

In my scenario, both my app and library module should add 

implementation 'com.google.protobuf:protobuf-javalite:3.9.1'

even app has a dependency on library

Upvotes: 0

dwursteisen
dwursteisen

Reputation: 11515

You're using the version 2.4.1 of protobuf which doesn't come with GeneratedMessageV3.

Update to a new version of protobuf which include this class like the 3.0.0

dependencies {
    compile group: 'io.netty', name: 'netty-all', version: '4.1.5.Final'
   compile group: 'com.google.protobuf', name: 'protobuf-java', version: '3.0.0'
}

Upvotes: 5

Adam Cozzette
Adam Cozzette

Reputation: 1476

I am not familiar with Gradle but it looks to me like you are mixing new protobuf generated code with an older protobuf library, which is not supported. The GeneratedMessageV3 class was added only recently (around 3.0 I believe), and so new generated code that references that class cannot be linked against an older library which does not include it.

Upvotes: 1

lance-java
lance-java

Reputation: 28099

Using the maven central advanced search for com.google.protobuf.GeneratedMessageV3 it seems that the class is in com.google.cloud:google-cloud-nio:xxx or maybe com.trueaccord.scalapb:protobuf-runtime-scala_yyy:zzz. I'm guessing you'll need to add one of these to your classpath.

Upvotes: 2

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