gRPC generated java files are getting duplicated or regenerated : class ClassNameGrpc is public and should be declared in a file named ClassNameGrpc - build.gradle

Question

I have created a gradle java project with 2 modules :
grpc client module
grpc server module
When i build them, for some reason the grpc and protobuf files are getting generated more than once. The 2nd file is getting generated with "2" suffixed and as such throwing error as shown in screen shot below.
The gradle file is as below and this is same in client and server.
apply plugin: 'java'
apply plugin: 'com.google.protobuf'
repositories {
mavenCentral()
}
def grpcVersion = '1.24.1'
dependencies {
compile "io.grpc:grpc-netty:${grpcVersion}"
compile "io.grpc:grpc-protobuf:${grpcVersion}"
compile "io.grpc:grpc-stub:${grpcVersion}"
compile 'com.google.protobuf:protobuf-java:3.9.2'
}
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.10'
}
}
protobuf {
protoc {
artifact = 'com.google.protobuf:protoc:3.9.2'
}
plugins {
grpc {
artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}"
}
}
generateProtoTasks {
all()*.plugins {
grpc {}
}
}
}
sourceSets {
main {
java {
srcDirs 'build/generated/source/proto/main/grpc'
srcDirs 'build/generated/source/proto/main/java'
}
}
}
jar {
manifest {
attributes "Main-Class": "ecommerce.ecommerce.OrderMgtServer"
}
from {
configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
}
}
// Generate IntelliJ IDEA's .idea & .iml project files
apply plugin: 'idea'
// Provide convenience executables for trying out the examples.
apply plugin: 'application'
startScripts.enabled = false

Answer 1

Use only one sourceSets {main { java· added the java plugin and the protobuf plugin of your version at the build.gradle.
plugins {
    id 'java'
    id 'com.google.protobuf' version '0.8.10'
    id 'idea'
}
dependencies {
implementation "io.grpc:grpc-netty-shaded:$grpc_version"
implementation "io.grpc:grpc-protobuf:$grpc_version"
implementation "io.grpc:grpc-stub:$grpc_version"
implementation "io.grpc:grpc-services:$grpc_version" // reflection
}
sourceSets.main.java.srcDir new File(buildDir, 'generated/source')
idea {
    module {
        // Marks the already(!) added srcDir as "generated"
        generatedSourceDirs += file('build/generated/source')
    }
}
After editing the build.gradle execute a task -> clean and task -> generateProtobuff. I think with it you fix your errors. About the dependencies.compile I am not sure if it affects. But I am using dependencies.implementation.