Using the Wire Maven Plugin

Put your ProtoBuf definition in src/main/proto
This is the default location where the plugin expects proto files.
Configure plugin in pom.xml
1. Add the plugin to your Maven build
  Replace the version with the latest one - or better, have the version controlled by Maven plugin management.
2. Configure plugin parameters
  For configuration details see the generate-sources goal description.
3. Hook the plugin into the Maven lifecycle for source code generation.
  The plugin runs before compilation in the generate-sources phase, and adds the generated sources for compilation.

Add Wire runtime dependency in pom.xml (required by Wire compiler generated sources)

<dependency>
  <groupId>com.squareup.wire</groupId>
  <artifactId>wire-runtime-jvm</artifactId>
  <version>4.9.3</version> <!-- Check for latest version -->
</dependency>

Generated sources can be found by default in ${project.build.directory}/generated-sources/wire , which the plugin automatically adds to the compilation source roots of your project.

Example configuration

<project>
...
  <dependencies>
    <!-- (3) Add Wire runtime dependency -->
    <dependency>
      <groupId>com.squareup.wire</groupId>
      <artifactId>wire-runtime-jvm</artifactId>
      <version>4.9.3</version> <!-- Check for latest version -->
    </dependency>
  </dependencies>
...
  <build>
    ...
    <plugins>
  
      <plugin>
        <!-- (2.1) Add the plugin to your Maven build -->
        <groupId>de.m3y.maven</groupId>
        <artifactId>wire-maven-plugin</artifactId>
        <version>1.3</version>
  
        <!-- (2.2) Optionally configure plugin / code generation.
                 Defaults should work nicely, unless you want to optimize (Android, pruning).
  
                 See generate-sources goal description and https://square.github.io/wire/wire_compiler/#java documentation.
        -->
        <configuration>
          <!-- Example options with defaults
          <emitAndroid>false</emitAndroid>
          <emitAndroidAnnotations>false</emitAndroidAnnotations>
          <emitCompact>false</emitCompact>
          <excludes>
            <exclude>ex.clude.me.*</exclude>
          </excludes>
          <includes>
            <include>keep.me.*</include>
          </includes>
          <generatedSourceDirectory>${project.build.directory}/generated-sources/wire</generatedSourceDirectory>
          <protoFiles>
          </protoFiles>
          <protoPaths>
          </protoPaths>
          <protoSourceDirectory>${project.basedir}/src/main/proto</protoSourceDirectory>
          -->
        </configuration>
  
        <!-- (2.3) Hook plugin into lifecycle for source code generation-->
        <executions>
          <execution>
              <phase>generate-sources</phase>
              <goals>
                  <goal>generate-sources</goal>
              </goals>
          </execution>
        </executions>
      </plugin>
  
    </plugins>
    ...
  </build>
</project>