gson/test-shrinker/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Copyright 2023 Google Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
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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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson-parent</artifactId>
    <version>2.13.3-SNAPSHOT</version>
  </parent>
  <artifactId>test-shrinker</artifactId>
  <name>Test: Code shrinking (ProGuard / R8)</name>

  <properties>
    <maven.compiler.release>8</maven.compiler.release>

    <!-- Overwrite property from parent -->
    <gson.isTestModule>true</gson.isTestModule>
  </properties>

  <pluginRepositories>
    <!-- R8 currently only exists in Google Maven repository -->
    <pluginRepository>
      <id>google</id>
      <url>https://maven.google.com</url>
    </pluginRepository>
  </pluginRepositories>

  <dependencies>
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>${project.parent.version}</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.google.truth</groupId>
      <artifactId>truth</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <!-- Process JAR with ProGuard -->
      <plugin>
        <groupId>com.github.wvengen</groupId>
        <artifactId>proguard-maven-plugin</artifactId>
        <version>2.7.0</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>proguard</goal>
            </goals>
          </execution>
        </executions>
        <!-- Upgrades ProGuard to version newer than the one included by plugin by default -->
        <dependencies>
          <dependency>
            <groupId>com.guardsquare</groupId>
            <artifactId>proguard-base</artifactId>
            <version>7.8.2</version>
          </dependency>
          <dependency>
            <groupId>com.guardsquare</groupId>
            <artifactId>proguard-core</artifactId>
            <version>9.2.0</version>
          </dependency>
        </dependencies>
        <configuration>
          <obfuscate>true</obfuscate>
          <proguardInclude>${project.basedir}/proguard.pro</proguardInclude>
          <options>
            <!-- Hacky solution to make ProGuard use the library rules file; only the Android plugin of ProGuard
              seems to consider it automatically at the moment, see https://github.com/Guardsquare/proguard/issues/337
              However, R8 defined further below always considers it automatically -->
            <option>-include</option><option>${project.basedir}/../gson/src/main/resources/META-INF/proguard/gson.pro</option>
          </options>
          <libs>
            <lib>${java.home}/jmods/java.base.jmod</lib>
            <!-- Used by Gson for optional SQL types support -->
            <lib>${java.home}/jmods/java.sql.jmod</lib>
            <!-- Used by transitive Error Prone annotations dependency -->
            <lib>${java.home}/jmods/java.compiler.jmod</lib>
          </libs>
          <!-- Include dependencies in the final JAR -->
          <includeDependencyInjar>true</includeDependencyInjar>
          <outjar>proguard-output.jar</outjar>
        </configuration>
      </plugin>

      <!-- Prepare a JAR with dependencies for R8 -->
      <!-- Once there is a proper R8 Maven plugin in the future, prefer that and provide
        dependencies as additional input JARs there instead of using the Shade plugin -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>3.6.1</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <createDependencyReducedPom>false</createDependencyReducedPom>
              <!-- Replace the main JAR -->
              <shadedArtifactAttached>false</shadedArtifactAttached>
              <filters>
                <filter>
                  <artifact>*:*</artifact>
                  <excludes>
                    <!-- Ignore duplicate files in dependencies -->
                    <exclude>META-INF/MANIFEST.MF</exclude>
                    <exclude>META-INF/versions/9/module-info.class</exclude>
                  </excludes>
                </filter>
              </filters>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <!-- Process JAR with R8; currently has no dedicated plugin so use Exec Maven Plugin instead -->
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>3.6.3</version>
        <executions>
          <execution>
            <id>r8</id>
            <phase>package</phase>
            <goals>
              <goal>java</goal>
            </goals>
            <configuration>
              <!-- R8 runs as standalone JAR, does not need any of the project classes -->
              <addOutputToClasspath>false</addOutputToClasspath>
              <includeProjectDependencies>false</includeProjectDependencies>
              <!-- R8 is specified as plugin dependency, see further below -->
              <includePluginDependencies>true</includePluginDependencies>
              <executableDependency>
                <!-- Uses R8 dependency declared below -->
                <groupId>com.android.tools</groupId>
                <artifactId>r8</artifactId>
              </executableDependency>
              <!-- See https://r8.googlesource.com/r8/+/refs/heads/main/README.md#running-r8 -->
              <!-- Without `pg-compat` argument this acts like "full mode", see
                https://r8.googlesource.com/r8/+/refs/heads/main/compatibility-faq.md#r8-full-mode -->
              <mainClass>com.android.tools.r8.R8</mainClass>
              <arguments>
                <argument>--release</argument>
                <!-- Produce Java class files instead of Android DEX files -->
                <argument>--classfile</argument>
                <argument>--lib</argument><argument>${java.home}</argument>
                <argument>--pg-conf</argument><argument>${project.basedir}/r8.pro</argument>
                <!-- Create mapping file to make debugging test failures easier -->
                <argument>--pg-map-output</argument><argument>${project.build.directory}/r8_map.txt</argument>
                <argument>--output</argument><argument>${project.build.directory}/r8-output.jar</argument>
                <argument>${project.build.directory}/${project.build.finalName}.jar</argument>
              </arguments>
            </configuration>
          </execution>
        </executions>
        <dependencies>
          <dependency>
            <!-- R8 dependency used above -->
            <!-- Note: For some reason Maven shows the warning "Missing POM for com.android.tools:r8:jar",
              but it appears that can be ignored -->
            <groupId>com.android.tools</groupId>
            <artifactId>r8</artifactId>
            <version>9.0.32</version>
          </dependency>
        </dependencies>
      </plugin>


      <!-- Run integration tests to verify shrunken JAR behavior -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-failsafe-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>integration-test</goal>
              <goal>verify</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>