protoc-gen-javapgv hasn't been updated to support optional fields in proto3

[nikoncode]

I have following proto file:

syntax = "proto3";

package com.example.demo;

option java_multiple_files = true;

message B {
  optional string a = 1;
}

Build configuration:

    protoc {
        artifact = "com.google.protobuf:protoc:3.17.3"
    }

    plugins {
        javapgv {
            artifact = "io.envoyproxy.protoc-gen-validate:protoc-gen-validate:0.4.1"
        }
    }

    generateProtoTasks {
        all()*.plugins {
            javapgv {
                option "lang=java"
            }
        }
    }
}

I got error on generateProto task:
protoc: stdout: . stderr: B.proto: is a proto3 file that contains optional fields, but code generator protoc-gen-javapgv hasn't been updated to support optional fields in proto3. Please ask the owner of this code generator to support proto3 optional.--javapgv_out:

We use optional to detect value presence. And we want to combine both worlds: validation & value presence support.

[akonradi]

See #431

[stale]

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