Integrate Protocol Buffers into Maven2 build

Question

I\'m experimenting with Protocol Buffers in an existing, fairly vanilla Maven 2 project. Currently, I invoke a shell script every time I need to update my generated sources. Thi

Answer 1

I think that using antrun to invoke non-Maven steps is the generally accepted solution.

You could also try the maven-exec-plugin.

Answer 2

I forked of the plugin from David Trott and have it compiling multiple languages which makes it a lot more useful. See the github project here and a tutorial on integrating it with a maven build here.

Answer 3

The accepted solution does not scale for multiple proto files. I had to come up with my own:

<build>
    <plugins>
        <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <executions>
                <execution>
                    <id>compile-protoc</id>
                    <phase>generate-sources</phase>
                    <configuration>
                        <tasks>
                            <mkdir dir="${generated.sourceDirectory}" />
                            <path id="proto.path">
                                <fileset dir="src/main/proto">
                                    <include name="**/*.proto" />
                                </fileset>
                            </path>
                            <pathconvert pathsep=" " property="proto.files" refid="proto.path" />
                            <exec executable="protoc" failonerror="true">
                                <arg value="--java_out=${generated.sourceDirectory}" />
                                <arg value="-I${project.basedir}/src/main/proto" />
                                <arg line="${proto.files}" />
                            </exec>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
</build>