common/config/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
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<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>
  <parent>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-parent_2.13</artifactId>
    <version>5.0.0-SNAPSHOT</version>
    <relativePath>../../pom.xml</relativePath>
  </parent>

  <artifactId>spark-config_2.13</artifactId>
  <packaging>jar</packaging>
  <name>Spark Project Config</name>
  <url>https://spark.apache.org/</url>
  <properties>
    <sbt.project.name>config</sbt.project.name>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-tags_${scala.binary.version}</artifactId>
    </dependency>

    <dependency>
      <groupId>com.google.protobuf</groupId>
      <artifactId>protobuf-java</artifactId>
      <scope>compile</scope>
    </dependency>

    <!--
      This spark-tags test-dep is needed even though it isn't used in this module, otherwise testing-cmds that exclude
      them will yield errors.
    -->
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-tags_${scala.binary.version}</artifactId>
      <type>test-jar</type>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
    <testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <!--
          Override the parent pom's shade configuration completely (rather than
          merging) so this module bundles protobuf-java relocated into a shared
          org.sparkproject.protobuf package. This keeps the unshaded protobuf-java
          off the classpath of every consumer of this low-level module (notably
          spark-common-utils, and transitively spark-core and the assembly), and
          removes protobuf-java from this module's published (dependency-reduced)
          pom. The relocation package is intentionally general (not config-specific)
          so other low-level modules can share it in the future.
        -->
        <configuration combine.self="override">
          <shadedArtifactAttached>false</shadedArtifactAttached>
          <shadeTestJar>false</shadeTestJar>
          <artifactSet>
            <includes>
              <include>com.google.protobuf:*</include>
            </includes>
          </artifactSet>
          <relocations>
            <relocation>
              <pattern>com.google.protobuf</pattern>
              <shadedPattern>${spark.shade.packageName}.protobuf</shadedPattern>
              <includes>
                <include>com.google.protobuf.**</include>
              </includes>
            </relocation>
          </relocations>
          <filters>
            <filter>
              <artifact>*:*</artifact>
              <excludes>
                <exclude>google/protobuf/**</exclude>
              </excludes>
            </filter>
          </filters>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <profiles>
    <profile>
      <id>default-protoc</id>
      <activation>
        <property>
          <name>!skipDefaultProtoc</name>
        </property>
      </activation>
      <build>
        <plugins>
          <plugin>
            <groupId>com.github.os72</groupId>
            <artifactId>protoc-jar-maven-plugin</artifactId>
            <version>${protoc-jar-maven-plugin.version}</version>
            <executions>
              <execution>
                <phase>generate-sources</phase>
                <goals>
                  <goal>run</goal>
                </goals>
                <configuration>
                  <protocArtifact>com.google.protobuf:protoc:${protobuf.version}</protocArtifact>
                  <protocVersion>${protobuf.version}</protocVersion>
                  <inputDirectories>
                    <include>src/main/protobuf</include>
                  </inputDirectories>
                </configuration>
              </execution>
            </executions>
          </plugin>
        </plugins>
      </build>
    </profile>
    <profile>
      <id>user-defined-protoc</id>
      <properties>
        <spark.protoc.executable.path>${env.SPARK_PROTOC_EXEC_PATH}</spark.protoc.executable.path>
      </properties>
      <build>
        <plugins>
          <plugin>
            <groupId>com.github.os72</groupId>
            <artifactId>protoc-jar-maven-plugin</artifactId>
            <version>${protoc-jar-maven-plugin.version}</version>
            <executions>
              <execution>
                <phase>generate-sources</phase>
                <goals>
                  <goal>run</goal>
                </goals>
                <configuration>
                  <protocArtifact>com.google.protobuf:protoc:${protobuf.version}</protocArtifact>
                  <protocVersion>${protobuf.version}</protocVersion>
                  <protocCommand>${spark.protoc.executable.path}</protocCommand>
                  <inputDirectories>
                    <include>src/main/protobuf</include>
                  </inputDirectories>
                </configuration>
              </execution>
            </executions>
          </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>
</project>