关于flink 读取 jdbc报错详情，序列化报错怎么办？

使用场景：FLink 1.11.1 读取mysql，一直报序列化错误，但感觉需要序列化的bean对象已经序列化，实在百思不得其解，前来求教各位大佬！！！ 代码再附件！！！

Exception in thread "main" org.apache.flink.api.common.InvalidProgramException: java.util.concurrent.CountDownLatch@45ca843[Count = 2] is not serializable. The object probably contains or references non serializable fields. at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:151) at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126) at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126) at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126) at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:71) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:1901) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1614) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1571) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1553) at com.hsq.APP.main(APP.java:43) Caused by: java.io.NotSerializableException: java.util.concurrent.CountDownLatch at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.apache.flink.util.InstantiationUtil.serializeObject(InstantiationUtil.java:586) at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:133) ... 9 more *来自志愿者整理的flink邮件归档