NoClassDefFoundError for RMIServerImpl when running Flink with Scala 2.12 and Java 11

[L . C . Hsieh]

Hi Flink developers,

I encountered a weird error like follows. It only happens when I build Flink 
with Scala 2.12 profile and run with Java 11. No such error for Scala 2.11 + 
Java 8/11.

Just search for relative info, but don't find any useful. Do you have any idea 
about this? Thanks.

java.lang.NoClassDefFoundError: javax/management/remote/rmi/RMIServerImpl
        at 
org.apache.flink.runtime.management.JMXService.getPort(JMXService.java:76) 
~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor.connectToResourceManager(TaskExecutor.java:1300)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor.tryConnectToResourceManager(TaskExecutor.java:1284)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor.reconnectToResourceManager(TaskExecutor.java:1279)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor.notifyOfNewResourceManagerLeader(TaskExecutor.java:1258)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor.access$800(TaskExecutor.java:181)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
        at 
org.apache.flink.runtime.taskexecutor.TaskExecutor$ResourceManagerLeaderListener.lambda$notifyLeaderAddress$0(TaskExecutor.java:2150)
 ~[flink-dist_2.12-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]