Cleans up unused constructors, methods and variables.

4 jobs from master in 26 minutes and 54 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build
passed #868
jars-j8

00:00:32

passed #867
java8

00:13:18

 
  Test
passed #869
java7

00:12:50

failed #870
allowed to fail
java9

00:00:13

 
Name Stage Failure
failed
java9 Test There is an unknown failure, please try again
	at java.base/sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:86)
... 72 more
2699 [ERROR]
2699 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
2699 [ERROR]
2699 [ERROR] For more information about the errors and possible solutions, please read the following articles:
2699 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
2699 [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
ERROR: Job failed: exit code 1