[Flink错误]Record has Long.MIN_VALUE timestamp (= no timestamp marker). Is the time characteristic set

报错:

Record has Long.MIN_VALUE timestamp (= no timestamp marker). Is the time characteristic set to 'ProcessingTime', or did you forget to call 'DataStream.assignTimestampsAndWatermarks(...)'?

原因:

在使用老版的窗口时,未指定时间语义,导致报错.

解决:

//需要设置时间语义
        env.setStreamTimeCharacteristic(TimeCharacteristic.ProcessingTime);