Fix Javadoc Build issues on JDK 11+

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc (default-cli) on project jboss-modules: An error has occurred in Javadoc report generation:
[ERROR] Exit code: 1 - /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/JDKSpecific.java:37: error: cannot find symbol
[ERROR] import sun.reflect.Reflection;
[ERROR] ^
[ERROR] symbol: class Reflection
[ERROR] location: package sun.reflect
[ERROR]
[ERROR] Command line was: /home/opalka/java/jdk/oracle/12/latest/bin/javadoc @options @packages
[ERROR]
[ERROR] Refer to the generated Javadoc files in '/home/opalka/git/redhat/jboss-modules/target/site/apidocs' dir.

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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc (default-cli) on project jboss-modules: An error has occurred in Javadoc report generation:
[ERROR] Exit code: 1 - javadoc: error - The code being documented uses modules but the packages defined in https://docs.oracle.com/javase/8/docs/api/ are in the unnamed module.
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/maven/MavenArtifactUtil.java:197: warning - @param argument "name" is not a parameter name.
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:548: warning - invalid usage of tag <
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:595: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:630: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:916: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:918: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:918: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:953: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:955: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:964: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:967: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:970: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:972: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:990: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:993: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:993: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:90: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:90: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:548: warning - invalid usage of tag <
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:595: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:630: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:916: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:918: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:918: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:953: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:955: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:964: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:967: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:970: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:972: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:990: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:993: warning - invalid usage of tag >
[ERROR] /home/opalka/git/redhat/jboss-modules/src/main/java/org/jboss/modules/xml/XmlPullParser.java:993: warning - invalid usage of tag >
[ERROR]
[ERROR] Command line was: /home/opalka/java/jdk/oracle/12/latest/bin/javadoc @options @argfile
[ERROR]
[ERROR] Refer to the generated Javadoc files in '/home/opalka/git/redhat/jboss-modules/target/site/apidocs' dir.
[ERROR]
[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/MojoExecutionException