Error:java: 无效的标记: --add-exports=java.base/sun.net.util=ALL-UNNAMED

[刘建刚]

      Hi, I am using flink 1.9 in idea. But when I run a unit test in idea.
The idea reports the following error:"Error:java: 无效的标记:
--add-exports=java.base/sun.net.util=ALL-UNNAMED".
      Everything is ok when I use flink 1.6. I am using jdk 1.8. Is it
related to the java version?