Where to implement service file when using grpc

[Passenger]

Using Java 

I created a protobuffer . I generated all the classes . The classes were generated in project/target directory .Now my java project folder looks like this

1) src

2) target

3) pom.xml

Proto file -

syntax="proto3";

option java_multiple_files = true;
option java_package="com.grpc.project1";

package com.grpc.project1;

message Person{
    string first_name=1;
    string last_name=2;

}

message Greeting{
    string message=1;
}

service HelloWorldService{

    rpc sayHello(Person) returns (Greeting);
}

Now src also has sub folder main/java

and target also has two sub folder -

1) /generated-sources/protobuf/grpc-java 

2)/generated-sources/protobuf/java

No i want to implement my HelloWorldService class where should I define the class ??

Inside src/main/java

or inside 

1) /generated-sources/protobuf/grpc-java 

2)/generated-sources/protobuf/java

If I create class inside src/main/java i am unable to extend HelloWorldServiceGrpc.HelloWorldServiceImpl niether i am able to import target folderbut it is present inside  /generated-sources/protobuf/grpc-java/com/grpc/project1 

[Kun Zhang]

Assuming you are using protobuf-maven-plugin, it doesn't matter that the generated files are under /generated-sources. The generated classes should be added automatically to your build path by the plugin. Just import them with the proper package names and your source should compile.

If it still doesn't work, you may want to share your whole project source so that other people can diagnose for you.

[aadarsh...@paytm.com]

proto file 

syntax="proto3";

package com.project.grpc.roleservice;

message UserRequest {
    string userName=1;
}

message RoleReply {
    string userRole=1;
}

service UserRoleFromServer{
    rpc getRoleUser(stream UserRequest) returns (stream RoleReply);
}

[aadarsh...@paytm.com]

gradle build buildscript {

ext {
    springBootVersion = '2.0.4.RELEASE'
}
repositories {
    mavenCentral()
}
dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    classpath("com.google.protobuf:protobuf-gradle-plugin:0.8.5")
    }
}


plugins {
id 'java'
}


apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'com.google.protobuf'

group 'com.project.grpc.roleservice'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

protobuf {
protoc {
    artifact = "com.google.protobuf:protoc:3.5.1-1"
}
plugins {
    grpc {
        artifact = 'io.grpc:protoc-gen-grpc-java:1.16.1'
    }
}
generateProtoTasks {
    all()*.plugins {
        grpc {}
    }
}
}

repositories {
    mavenCentral()
}

dependencies {

compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-web')
compile( 'io.grpc:grpc-netty-shaded:1.16.1')
compile('io.grpc:grpc-protobuf:1.16.1')
compile('io.grpc:grpc-stub:1.16.1')
compile 'io.github.lognet:grpc-spring-boot-starter:3.0.0'
runtime('org.springframework.boot:spring-boot-devtools')
runtime('mysql:mysql-connector-java')
testCompile (group: 'junit', name: 'junit', version: '4.12')
}