spring-soap/spring-protobuf/src/main/java/com/baeldung/protobuf/convert/ProtobufUtil.java

package com.baeldung.protobuf.convert;

import java.io.IOException;

import com.google.protobuf.AbstractMessage.Builder;
import com.google.protobuf.Message;
import com.google.protobuf.MessageOrBuilder;
import com.google.protobuf.Struct;
import com.google.protobuf.util.JsonFormat;

public class ProtobufUtil {

    public static String toJson(MessageOrBuilder messageOrBuilder) throws IOException {
        return JsonFormat.printer().print(messageOrBuilder);
    }

    @SuppressWarnings("unchecked")
    public static Message fromJson(String json) throws IOException {
        Builder structBuilder = Struct.newBuilder();
        JsonFormat.parser().ignoringUnknownFields().merge(json, structBuilder);
        return structBuilder.build();
    }

}