Scala example source code file (bug2318.scala)

This example Scala source code file (bug2318.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

array, bar, bar, destroyable, destroyable, mgr, permission, security, securitymanager, test, test, unit, unit

The Scala bug2318.scala source code

import java.security._

object Test {
  trait Bar { def bar: Unit }
  
  object Mgr extends SecurityManager {
    override def checkPermission(perm: Permission) = perm match {
      case _: java.lang.RuntimePermission                                                   => ()
      case _: java.io.FilePermission                                                        => ()
      case x: java.security.AccessControlException if x.getName contains ".networkaddress." => () // generality ftw
      case _                                                                                => super.checkPermission(perm)
    }
  }
  
  def bug1() = {
    val p = Runtime.getRuntime().exec("ls");
    type Destroyable = { def destroy() : Unit }
    def doDestroy( obj : Destroyable ) : Unit = obj.destroy(); 
    doDestroy( p );
  }
  def bug2() = {
    System.setSecurityManager(Mgr)

    val b = new Bar { def bar = println("bar") }
    b.bar

    val structural = b.asInstanceOf[{ def bar: Unit }]
    structural.bar
  }
  
  def main(args: Array[String]) {
    // figuring this will otherwise break on windows
    try bug1()
    catch { case _: java.io.IOException => () }
    
    bug2()
  }
}