import java.io. {FileInputStream, FileOutputStream, ObjectInputStream, ObjectOutputStream}
object SymbolSerializeDemo {
  def main(args: Array[String]): Unit = {
    val fileName = "file.ser"
    val symbolCheck: Symbol = Symbol("someSymbol")
    //serializeToFile(symbolCheck, fileName)
    deserializeFromFile(fileName)
  }
  private def serializeToFile(input: Symbol, fileName: String): Unit = {
    try {
      val file: FileOutputStream = new FileOutputStream(fileName)
      val out: ObjectOutputStream = new ObjectOutputStream(file)
      out.writeObject(input)
    }
  }
  private def deserializeFromFile(fileName: String): Unit = {
    try {
      val file: FileInputStream = new FileInputStream(fileName)
      val input: ObjectInputStream = new ObjectInputStream(file)
      val output = input.readObject.asInstanceOf[Symbol]
      println("Symbol after deseralization "   output.name)
    }
  }
}

I am trying to deserialized scala symbol, serialized in scala 2.11 but I am getting error as java.io.InvalidClassException: scala.Symbol; local class incompatible: stream classdesc serialVersionUID = 2966401305346518859, local class serialVersionUID = 6865603221856321286 Can we write custom serialization for this or any other option?

I tried adding serialVersionUID for class as well as for Symbol

CodePudding user response：

Can you run Scala 2.11 from Scala 2.12 for deserialization or will it be too slow?

// Scala 2.12
import sys.process._

Symbol("scala-2.11.12/bin/scala path_to_deserializer/Deserializer.scala path_to_file/file.ser".!!)
// 'someSymbol

// Deserializer.scala
import java.io.{FileInputStream, ObjectInputStream}

object Deserializer {
  def main(args: Array[String]): Unit = {
    deserializeFromFile(args(0))
  }

  private def deserializeFromFile(fileName: String): Unit = {
    val file: FileInputStream = new FileInputStream(fileName)
    val input: ObjectInputStream = new ObjectInputStream(file)
    val output = input.readObject.asInstanceOf[Symbol]
    println(output.name)
  }
}

CodePudding user response：

I have fixed the issue by downgrading scala version from 2.12.17 to 2.12.6.