java version "10.0.2" 2018-07-17 javax.annotation

[a75c6]

gRPC version 1.14.0

Error has been referenced before:

#3633

When using java version "10.0.2" 2018-07-17 and building Kotlin example, receive the same error:

:compileJava FAILED
/examples/example-kotlin/build/generated/source/proto/main/grpc/io/grpc/examples/helloworld/GreeterGrpc.java:23: error: cannot find symbol
@javax.annotation.Generated(
                 ^
  symbol:   class Generated
  location: package javax.annotation

Have added the following dependency to resolve:
compile group: 'javax.annotation', name: 'javax.annotation-api', version: '1.3.2'

Is that the recommended solution?

Here is the previous build.gradle currently in the example:

https://github.com/grpc/grpc-java/blob/master/examples/example-kotlin/build.gradle

Here is an updated build.gradle that runs without the error:

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This is a general purpose Gradle build.
 * Learn how to create Gradle builds at https://guides.gradle.org/creating-new-gradle-builds/
 */
buildscript {
    ext.kotlin_version = '1.2.60'

    repositories {
        mavenCentral()
        mavenLocal()
    }
    dependencies {
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.6'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

plugins {
    id 'com.gradle.build-scan' version '1.15.1' 
}

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

// Generate IntelliJ IDEA's .idea & .iml project files
// Starting with 0.8.4 of protobuf-gradle-plugin, *.proto and the gen output files are added
// to IntelliJ as sources. It is no longer necessary to add them manually to the idea {} block
// to jump to definitions from Java and Kotlin files.
// For best results, install the Protobuf and Kotlin plugins for IntelliJ.
apply plugin: 'idea'

// Provide convenience executables for trying out the examples.
apply plugin: 'application'

buildScan {
    termsOfServiceUrl = 'https://gradle.com/terms-of-service'
    termsOfServiceAgree = 'yes'
}

repositories {
    mavenCentral()
    mavenLocal()
}

// IMPORTANT: You probably want the non-SNAPSHOT version of gRPC. Make sure you
// are looking at a tagged version of the example and not "master"!

// Feel free to delete the comment at the next line. It is just for safely
// updating the version in our release process.
def grpcVersion = '1.14.0' // CURRENT_GRPC_VERSION

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    compile "com.google.api.grpc:proto-google-common-protos:1.12.0"
    compile group: 'javax.annotation', name: 'javax.annotation-api', version: '1.3.2'
    compile "io.grpc:grpc-netty:${grpcVersion}"
    compile "io.grpc:grpc-protobuf:${grpcVersion}"
    compile "io.grpc:grpc-stub:${grpcVersion}"

    testCompile "io.grpc:grpc-testing:${grpcVersion}" // gRCP testing utilities
    testCompile "junit:junit:4.12"
    testCompile "org.mockito:mockito-core:1.9.5"
}

protobuf {
    protoc { artifact = 'com.google.protobuf:protoc:3.6.1' }
    plugins {
        grpc { artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}" }
    }
    generateProtoTasks {
        all()*.plugins { grpc {} }
    }
}

startScripts.enabled = false

task helloWorldServer(type: CreateStartScripts) {
    mainClassName = 'io.grpc.examples.helloworld.HelloWorldServer'
    applicationName = 'hello-world-server'
    outputDir = new File(project.buildDir, 'tmp')
    classpath = jar.outputs.files + project.configurations.runtime
}

task helloWorldClient(type: CreateStartScripts) {
    mainClassName = 'io.grpc.examples.helloworld.HelloWorldClient'
    applicationName = 'hello-world-client'
    outputDir = new File(project.buildDir, 'tmp')
    classpath = jar.outputs.files + project.configurations.runtime
}

applicationDistribution.into('bin') {
    from(helloWorldServer)
    from(helloWorldClient)
    fileMode = 0755
}

[dapengzhang0]

I think the Kotlin build.gradle file is missing
compileOnly "javax.annotation:javax.annotation-api:1.2"
which had to be added in https://github.com/grpc/grpc-java/blob/master/examples/build.gradle to fix #3633

[dapengzhang0]

@namsoila thanks for pointing out the issue!

[a75c6]

Thanks!

[dapengzhang0]

We still need a fix to kotlin build.gradle in examples directory though.

[a75c6]

Sounds good. Version 1.3.2 is available. Is there a specific reason for 1.2?

// https://mvnrepository.com/artifact/javax.annotation/javax.annotation-api
compile group: 'javax.annotation', name: 'javax.annotation-api', version: '1.3.2'

[dapengzhang0]

The reason seemed to be that version 1.3.2 doesn't support Java 7. Once grpc stops supporting Java 7, we can bump it to 1.3.2. For your own project with JDK 10, no problem to use 1.3.2

[a75c6]

Thanks.