Upgrade maven-enforcer-plugin to support later versions of Java

[volmasoft]

Background
Currently the master branch of accumulo-proxy ships with maven-enforcer-plugin to require as minimum of:

• Maven 3.5.0
• Java 11 or greater

These are configured in the pom.xml as shown below:

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <executions>
          <execution>
            <!-- must be same id as in the apache parent pom, to override the version -->
            <id>enforce-maven-version</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <phase>validate</phase>
            <configuration>
              <rules>
                <requireMavenVersion>
                  <version>[3.5.0,)</version>
                </requireMavenVersion>
                <requireJavaVersion>
                  <version>[11,)</version>
                </requireJavaVersion>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>

When attempting to compile accumulo-proxy with Java 14 and Maven 3.6.3 (both meet the requirements) compilation fails as the maven-enforcer-plugin fails to execute (see below for full logs)

Looking into this it seems to be due to Java including openjdk changing their numbering conventions, I checked both:

/Library/Java/JavaVirtualMachines/jdk-14.jdk/Contents/Home/bin/java --version
java 14 2020-03-17
Java(TM) SE Runtime Environment (build 14+36-1461)
Java HotSpot(TM) 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

/Library/Java/JavaVirtualMachines/openjdk-14.jdk/Contents/Home/bin/java --version
openjdk 14 2020-03-17
OpenJDK Runtime Environment (build 14+36-1461)
OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

maven-enforcer-plugin comes with a target to verify the values being retrieved from the environment and I've executed this both on the default (1.4.1) and on the latest version (3.0.0-M3)

1.4.1
This successfully gets the maven version (3.6.3) but fails to get the Java version, specifically see the line "[ERROR] : begin 0, end 3, length 2" towards the end, this is where it is trying to parse the version number and fails.

mvn org.apache.maven.plugins:maven-enforcer-plugin:1.4.1:display-info
[INFO] Scanning for projects...
[INFO] 
[INFO] -----------------< org.apache.accumulo:accumulo-proxy >-----------------
[INFO] Building Apache Accumulo Proxy 2.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-enforcer-plugin:1.4.1:display-info (default-cli) @ accumulo-proxy ---
[INFO] Maven Version: 3.6.3
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.697 s
[INFO] Finished at: 2020-04-16T14:14:05-04:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:1.4.1:display-info (default-cli) on project accumulo-proxy: Execution default-cli of goal org.apache.maven.plugins:maven-enforcer-plugin:1.4.1:display-info failed: An API incompatibility was encountered while executing org.apache.maven.plugins:maven-enforcer-plugin:1.4.1:display-info: java.lang.ExceptionInInitializerError: null
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-enforcer-plugin:1.4.1
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/plugins/maven-enforcer-plugin/1.4.1/maven-enforcer-plugin-1.4.1.jar
[ERROR] urls[1] = file:/Users/nathanielfreeman/.m2/repository/backport-util-concurrent/backport-util-concurrent/3.1/backport-util-concurrent-3.1.jar
[ERROR] urls[2] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.11/plexus-interpolation-1.11.jar
[ERROR] urls[3] = file:/Users/nathanielfreeman/.m2/repository/org/slf4j/slf4j-jdk14/1.5.6/slf4j-jdk14-1.5.6.jar
[ERROR] urls[4] = file:/Users/nathanielfreeman/.m2/repository/org/slf4j/jcl-over-slf4j/1.5.6/jcl-over-slf4j-1.5.6.jar
[ERROR] urls[5] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/reporting/maven-reporting-api/2.2.1/maven-reporting-api-2.2.1.jar
[ERROR] urls[6] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/doxia/doxia-sink-api/1.1/doxia-sink-api-1.1.jar
[ERROR] urls[7] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/doxia/doxia-logging-api/1.1/doxia-logging-api-1.1.jar
[ERROR] urls[8] = file:/Users/nathanielfreeman/.m2/repository/commons-cli/commons-cli/1.2/commons-cli-1.2.jar
[ERROR] urls[9] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-interactivity-api/1.0-alpha-4/plexus-interactivity-api-1.0-alpha-4.jar
[ERROR] urls[10] = file:/Users/nathanielfreeman/.m2/repository/org/sonatype/plexus/plexus-sec-dispatcher/1.3/plexus-sec-dispatcher-1.3.jar
[ERROR] urls[11] = file:/Users/nathanielfreeman/.m2/repository/org/sonatype/plexus/plexus-cipher/1.4/plexus-cipher-1.4.jar
[ERROR] urls[12] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-utils/3.0.22/plexus-utils-3.0.22.jar
[ERROR] urls[13] = file:/Users/nathanielfreeman/.m2/repository/commons-lang/commons-lang/2.3/commons-lang-2.3.jar
[ERROR] urls[14] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/enforcer/enforcer-api/1.4.1/enforcer-api-1.4.1.jar
[ERROR] urls[15] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/enforcer/enforcer-rules/1.4.1/enforcer-rules-1.4.1.jar
[ERROR] urls[16] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/shared/maven-common-artifact-filters/1.4/maven-common-artifact-filters-1.4.jar
[ERROR] urls[17] = file:/Users/nathanielfreeman/.m2/repository/org/beanshell/bsh/2.0b4/bsh-2.0b4.jar
[ERROR] urls[18] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/shared/maven-dependency-tree/2.2/maven-dependency-tree-2.2.jar
[ERROR] urls[19] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-component-annotations/1.5.5/plexus-component-annotations-1.5.5.jar
[ERROR] urls[20] = file:/Users/nathanielfreeman/.m2/repository/org/eclipse/aether/aether-util/0.9.0.M2/aether-util-0.9.0.M2.jar
[ERROR] urls[21] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-i18n/1.0-beta-6/plexus-i18n-1.0-beta-6.jar
[ERROR] urls[22] = file:/Users/nathanielfreeman/.m2/repository/org/apache/maven/plugin-testing/maven-plugin-testing-harness/1.3/maven-plugin-testing-harness-1.3.jar
[ERROR] urls[23] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-archiver/2.2/plexus-archiver-2.2.jar
[ERROR] urls[24] = file:/Users/nathanielfreeman/.m2/repository/org/codehaus/plexus/plexus-io/2.0.4/plexus-io-2.0.4.jar
[ERROR] urls[25] = file:/Users/nathanielfreeman/.m2/repository/junit/junit/4.11/junit-4.11.jar
[ERROR] urls[26] = file:/Users/nathanielfreeman/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
[ERROR] 
[ERROR] -----------------------------------------------------
[ERROR] : begin 0, end 3, length 2
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException

**3.0.0-M3 **
This successfully executes and identifies the correct versions:

mvn org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M3:display-info
[INFO] Scanning for projects...
[INFO] 
[INFO] -----------------< org.apache.accumulo:accumulo-proxy >-----------------
[INFO] Building Apache Accumulo Proxy 2.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-enforcer-plugin:3.0.0-M3:display-info (default-cli) @ accumulo-proxy ---
[INFO] Maven Version: 3.6.3
[INFO] JDK Version: 14 normalized as: 14
[INFO] OS Info: Arch: x86_64 Family: mac Name: mac os x Version: 10.15.4
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.657 s
[INFO] Finished at: 2020-04-16T14:13:00-04:00
[INFO] ------------------------------------------------------------------------

If someone can assign the issue to me I have a proposed fix of simply upgrading the dependency to 3.0.0-M3