pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>example</groupId>
  <artifactId>java-agent</artifactId>
  <version>1</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <jib-maven-plugin.version>3.1.4</jib-maven-plugin.version>
    <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
    <download-maven-plugin.version>1.4.2</download-maven-plugin.version>
    <git-commit-id-plugin.version>3.0.1</git-commit-id-plugin.version>

    <!-- agents will be extracted relative to this build location -->
    <agent-extraction-root>${project.build.directory}/jib-agents</agent-extraction-root>

    <!-- location of Stackdriver Debugger Java Agent https://cloud.google.com/debugger/docs/setup/java -->
    <stackdriver-debugger-agent-url>https://storage.googleapis.com/cloud-debugger/compute-java/debian-wheezy/cdbg_java_agent_gce.tar.gz</stackdriver-debugger-agent-url>

    <!-- where to place the Stackdriver Debugger Java Agent in the container -->
    <stackdriver-debugger-agent-location>/opt/cdbg</stackdriver-debugger-agent-location>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.sparkjava</groupId>
      <artifactId>spark-core</artifactId>
      <version>2.9.1</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-simple</artifactId>
      <version>1.7.28</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven-compiler-plugin.version}</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>

      <plugin>
        <groupId>pl.project13.maven</groupId>
        <artifactId>git-commit-id-plugin</artifactId>
        <version>${git-commit-id-plugin.version}</version>
        <executions>
          <execution>
            <goals>
              <goal>revision</goal>
            </goals>
            <!-- *NOTE*: The default phase of revision is initialize, but 
              in case you want to change it, you can do so by adding the phase here -->
            <phase>initialize</phase>
            <configuration>
              <generateGitPropertiesFile>true</generateGitPropertiesFile>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <!-- Jib -->
      <plugin>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>jib-maven-plugin</artifactId>
        <version>${jib-maven-plugin.version}</version>
        <configuration>
          <to>
            <image>gcr.io/REPLACE-WITH-YOUR-GCP-PROJECT/image-built-with-jib</image>
          </to>
          <extraDirectories>
            <paths>${agent-extraction-root}</paths>
          </extraDirectories>
          <container>
            <ports>4567</ports>
            <jvmFlags>
              <jvmFlag>-agentpath:${stackdriver-debugger-agent-location}/cdbg_java_agent.so=--logtostderr=1</jvmFlag>
              <jvmFlag>-Dcom.google.cdbg.module=${project.artifactId}</jvmFlag>
              <jvmFlag>-Dcom.google.cdbg.version=${project.version}</jvmFlag>
            </jvmFlags>
          </container>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>build</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>com.googlecode.maven-download-plugin</groupId>
        <artifactId>download-maven-plugin</artifactId>
        <version>${download-maven-plugin.version}</version>
        <executions>
          <execution>
            <id>install-stackdriver-debugger</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>wget</goal>
            </goals>
            <configuration>
              <url>${stackdriver-debugger-agent-url}</url>
              <unpack>true</unpack>
              <outputDirectory>${agent-extraction-root}/${stackdriver-debugger-agent-location}</outputDirectory>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>