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错误描述：
could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[String]
Error:(17, 15) could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[String]
.flatMap(_.split(" "))
Error:(17, 15) not enough arguments for method flatMap: (implicit evidence$16: org.apache.flink.api.common.typeinfo.TypeInformation[String], implicit evidence$17: scala.reflect.ClassTag[String])org.apache.flink.api.scala.DataSet[String].
Unspecified value parameters evidence$16, evidence$17.
.flatMap(_.split(" "))
官网说明:
1：A frequent reason if that the code that generates the TypeInformation has not been imported. Make sure to import the entire flink.api.scala package.
2：Another common cause are generic methods, which can be fixed as described in the following section.
解决方法:
推荐的做法是在代码中引入以下包：
import org.apache.flink.streaming.api.scala._
如果数据是有限的（静态数据集），我们可以引入以下包：
import org.apache.flink.api.scala._
如果通过以上方式问题还是没有解决，则看下Scala版本问题。
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