Flink&Scala-bug: Malformed class name

Project scene:

In the Flink code developed using Scala , a case class is defined in the method

E.g:

def csvFile(env:ExecutionEnvironment) = {
    // 导入隐士转换
    import org.apache.flink.api.scala._
    val filePath = "file:///data/word.csv"
    case class MyCaseClass(name:String, age:Int)
    // case class 方式
    env.readCsvFile[MyCaseClass](filePath,ignoreFirstLine = true, includedFields = Array(0,1)).print()
}

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Problem Description:

An error is reported when running the code:

Exception in thread "main" java.lang.InternalError: Malformed class name

Cause Analysis:

I don't know what the reason is. I checked on Google and found a little trace. It seems to be a bug of the jdk1.8 version. It has been recorded in the scala bug submission list. After looking at it for a long time, I didn't find out how to solve it.

Scala code bug Issues have been closed in 2012. . . .

 

---

solution:

As above, when we define case classes in Flink, in order to avoid the above bugs, do not define case classes in methods .

Correct code:

object app{
    def main(args: Array[String]): Unit = {

    // step 1 创建环境
    val env = ExecutionEnvironment.getExecutionEnvironment

    csvFile(env)

  }
    def csvFile(env:ExecutionEnvironment) = {
    // 导入隐士转换
    import org.apache.flink.api.scala._
    val filePath = "file:///data/word.csv"
    // case class 方式
    env.readCsvFile[MyCaseClass](filePath,ignoreFirstLine = true, includedFields = Array(0,1)).print()}

}


case class MyCaseClass(name:String, age:Int)