Build error with JDK 10 & 11

[vbekiaris]

When building with JDK 10 or 11, maven-javadoc-plugin fails to generate javadocs with a NullPointerException:

[INFO] --- maven-javadoc-plugin:3.0.0-M1:jar (attach-javadocs) @ cache-api ---
[ERROR] RuntimeException: Error while generating Javadoc: null
java.lang.NullPointerException
	at org.apache.commons.lang3.SystemUtils.isJavaVersionAtLeast(SystemUtils.java:1626)
	at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.getJavadocExecutable(AbstractJavadocMojo.java:3589)
	at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport(AbstractJavadocMojo.java:1963)
	at org.apache.maven.plugins.javadoc.JavadocJar.doExecute(JavadocJar.java:188)
	at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.execute(AbstractJavadocMojo.java:1889)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

This seems to be this issue which is fixed in maven-javadoc-plugin version 3.0.1.

The same NPE also affects TCK and RI builds.