如何生成protobuf 3.0 jar java？

syntax = "proto3";

package com.example;

message Person {
  string name = 1;
  int32 age = 2;
}

protoc --java_out=src/main/java proto/example.proto

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>protobuf-example</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <protobuf.version>3.0.0</protobuf.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>${protobuf.version}</version>
        </dependency>
    </dependencies>
</project>

mvn package