ADDITIONAL SYSTEM INFORMATION :
- Linux Fedora30
- Maven 3.6.3
- Maven Java Compiler plugin 3.8.1
- OpenJDK16 EA build 18


A DESCRIPTION OF THE PROBLEM :
It looks like ZookKeeper does not build on JDK16 (it does with JDK15)

my error is:
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (pre-compile-jute) on project zookeeper-jute: Fatal error compiling: error: invalid flag: -Xdoclint:-missing -> [Help 1]

This is Maven debug:
[DEBUG] Classpath:
[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes
[DEBUG] /home/eolivelli/.m2/repository/org/apache/yetus/audience-annotations/0.5.0/audience-annotations-0.5.0.jar
[DEBUG] Source roots:
[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/src/main/java
[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/java
[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations
[DEBUG] Command line options:
[DEBUG] -d /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes -classpath /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes:/home/eolivelli/.m2/repository/org/apache/yetus/audience-annotations/0.5.0/audience-annotations-0.5.0.jar: -sourcepath /home/eolivelli/dev/zookeeper/zookeeper-jute/src/main/java:/home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/java:/home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations: -s /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations -g --release 8 -encoding UTF-8 -Werror -Xlint:deprecation -Xlint:unchecked -Xlint:-options -Xdoclint:-missing -Xpkginfo:always
[DEBUG] incrementalBuildHelper#beforeRebuildExecution
[INFO] Compiling 36 source files to /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes

from "javac -help -X" it looks like "-Xdoclint:-missing" is a valid option

REGRESSION : Last worked in version 15

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
(install Maven 3.6.3)

git clone https://github.com/apache/zookeeper
JAVA_HOME=/path/to/jdk-16 mvn clean package -DskipTest

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The build passes
ACTUAL -
 invalid flag: -Xdoclint:-missing

CUSTOMER SUBMITTED WORKAROUND :
Do not enable "-Xdoclint:-missing" option

FREQUENCY : always