Flink中scala提示错误——could not find implicit value for evidence parameter of type org.apa

Flink第一个简单的demo ，wordCount

该问题参考引用如下：

---

自身代码中问题：

package cetc.flink

import org.apache.flink.api.scala.ExecutionEnvironment

object FlinKMain {

  def main(args: Array[String]): Unit = {
    // 1.设置运行环境
    val env = ExecutionEnvironment.getExecutionEnvironment

    //2.创造测试数据
    val text = env.fromElements("To be, or not to be,that is the question")

    //3.进行wordcount运算
    val counts = text.flatMap(_.toLowerCase.split("\\W+"))
      .map((_, 1)).groupBy(0).sum(1)
    //4.打印测试结构
    counts.print()
    
  }
  
}

运行时候出错如下：

Error:(13, 32) could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[String]
    val text = env.fromElements("To be, or not to be,that is the question")
Error:(13, 32) not enough arguments for method fromElements: (implicit evidence$14: scala.reflect.ClassTag[String], implicit evidence$15: org.apache.flink.api.common.typeinfo.TypeInformation[String])org.apache.flink.api.scala.DataSet[String].
Unspecified value parameter evidence$15.
    val text = env.fromElements("To be, or not to be,that is the question")

解决问题：

这是因为在当前环境之下找到不到scala的包，引入如下声明即可

import org.apache.flink.api.scala._

产生这个问题的原因（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.

我碰到的是问题1的情况。