debug class

gistfile1.txt

     import org.apache.hadoop.fs.FileSystem
     import org.apache.hadoop.fs.Path
     import org.apache.hadoop.mapred.JobConf
     import java.util.ServiceLoader

     val path = new Path(readURL)
     val c= new JobConf()
     val sl = ServiceLoader.load(classOf[FileSystem])
import scala.collection.JavaConversions._
     sl.iterator.toList.foreach { fs =>
     println(s"${fs.getScheme()} - ${fs.getClass()}")
     }

     println(s"${c.getClass("fs.s3n.impl", null)}")


     import java.lang.reflect._
    val field = classOf[FileSystem].getDeclaredField("SERVICE_FILE_SYSTEMS")
    val modifiersField = classOf[Field].getDeclaredField("modifiers");
    modifiersField.setAccessible(true)
    modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
    field.setAccessible(true)
    field.get(null).asInstanceOf[Map[String, Class[FileSystem]]].foreach(println)

     try {
     path.getFileSystem(c)
     } catch {
      case e:Exception =>
         println(e)
         field.get(null).asInstanceOf[Map[String, Class[FileSystem]]].foreach(println)
         println("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH")
         System.exit(1)
     }