<executions>
          <execution>
            <phase>validate</phase>
            <goals>
              <goal>eval</goal>
            </goals>
            <configuration>
              <outputFile>target/jdk.properties</outputFile>
              <expressions>
                <expression>project/properties</expression>
              </expressions>
            </configuration>
          </execution>
        </executions>

      <plugins>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.1</version>
          <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <encoding>UTF-8</encoding>
            <parameters>true</parameters>
            <compilerArgs>
              <!--
                   Make includes/excludes fully work:

          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-clean-plugin</artifactId>
            <executions>
              <execution>
                <id>clean-target-dir</id>
                <goals>
                  <goal>clean</goal>
                </goals>
                <phase>prepare-package</phase>
                <configuration>

                    {
                        java.util.Map<String, SnapshotVersion> versions = new java.util.LinkedHashMap<>();
                        // never convert from legacy to new format if either source or target is legacy format
                        if ( !v.getSnapshotVersions().isEmpty() )
                        {
                            for ( SnapshotVersion sv : versioning.getSnapshotVersions() )