title: gRPC client: error in compiled file (io.grpc.protobuf does not exist)
body: <p>I made a simple protobuf+gRPC server/client example with Python, and wanted now to complete it with an Android Java client. However, I struggled through the documentation and got it mostly working (.proto compiles in Android Studio), BUT now I get Errors in the output *Grpc.java file (i.e. if I fix it it will just be overwritten by the compiler):</p>
  
  <pre><code>error: package io.grpc.protobuf does not exist
  error: package com.google.protobuf.Descriptors does not exist
  </code></pre>
  
  <p>Since I get errors from io.gprc's and com.google's protobuf, I suspect a definition conflict in my gradle, but I cannot find/resolve it (went through several "tutorials" and it seemed common to use a mix of grpc and google sources).</p>
  
  <p>Here is my build.gradle:</p>
  
  <pre><code>
  android {
      compileSdkVersion 29
      buildToolsVersion "29.0.2"
      defaultConfig {
          applicationId "***.grpcclient"
          minSdkVersion 21
          targetSdkVersion 29
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  
  
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'androidx.appcompat:appcompat:1.0.2'
      implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'androidx.test.ext:junit:1.1.0'
      androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
      implementation 'io.grpc:grpc-okhttp:1.25.0'
      //implementation 'io.grpc:grpc-protobuf-lite:1.25.0'
  
      implementation 'com.google.protobuf:protobuf-javalite:3.8.0'
      implementation 'io.grpc:grpc-stub:1.25.0'
      implementation 'org.glassfish:javax.annotation:10.0-b28'
  }
  
  apply plugin: 'com.google.protobuf'
  
  buildscript {
      repositories {
          mavenCentral()
      }
      dependencies {
          classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.10'
      }
  }
  
  protobuf {
      protoc {
          artifact = 'com.google.protobuf:protoc:3.8.0'
      }
      plugins {
          grpc {
              artifact = 'io.grpc:protoc-gen-grpc-java:1.25.0'
          }
      }
      generateProtoTasks {
          all().each { task -&gt;
  
                  task.builtins {
                      java {
                          option "lite"
                      }
                      python { }
                  }
                  task.plugins {
                      grpc {outputSubDir = 'java'}
                  }
  
          }
      }
  }
  </code></pre>
  
  <p>Any help is appreciated!</p>