Re: [scala-ide-user] "too many arguments for method copyMemory: " in

[Simon Schäfer]

This doesn't seem to be a problem of Scala IDE. After quick googling it came out that the method doesn't exist in OpenJDK6: http://mail.openjdk.java.net/pipermail/jdk6-dev/2013-January/002836.html

On 05/14/2013 03:31 AM, Cheng Hao wrote:

Hi, 

   I tried the following scala code with eclipse 

"Scala IDE build of Eclipse SDK

Build id: 3.0.0-vfinal-20130326-1453-Typesafe" under Ubuntu LTS 12.03

object T extends App {

  val unsafe: sun.misc.Unsafe = {

      val unsafeField = classOf[sun.misc.Unsafe].getDeclaredField("theUnsafe")

      unsafeField.setAccessible(true)

      unsafeField.get(null).asInstanceOf[sun.misc.Unsafe]

  }

  def t()  {

    //too many arguments for method copyMemory: (x$1: Long, x$2: Long, x$3: Long)Unit

    unsafe.copyMemory(null, 1, null, 1, 100)  // cannot be compiled of this line within the Scala IDE

  } 

  println (System.getProperty("java.version")) // 1.6.0_45

  println (System.getProperty("java.vm.version")) // 20.45-b01

  println (scala.util.Properties.scalaPropOrElse("version.number", "unknown")) // 2.9.3

}

The IDE complaints about "too many arguments for method copyMemory: (x$1: Long, x$2: Long, x$3: Long)Unit" for the line "unsafe.copyMemory(null, 1, null, 1, 100)"; but I am pretty sure the sun.misc.Unsafe has the method signature "copyMemory(Object,long,Object,long,long):void"

And I also tried that in Scala Interpreter and Scala IDE on windows 7, everything works fine.

And I also tried that with the ScalaIDE(for scala 2.10), everything works fine too.

Seems it's a quite specific Scala IDE issue for Scala 2.9.3 under Ubuntu to me.

Appreciate it if any comment or workaround solution for that, I have to coding under Ubuntu with scala 2.9.3.

Thanks,

Hao

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[Luc Bourlier]

It might be linked to this ticket: https://www.assembla.com/spaces/scala-ide/simple_planner#/ticket:1001387

It is possible that with Scala 2.9.x, the builder doesn't use the specified JDK. It would have to be checked.

Luc

[Cheng Hao]

"changing buildmanager from sbt to refined in

Preferences->Scala->Compiler-"Build Manager"
fixes this issue"

This works.

Thank you.

Hao

在 2013年5月14日星期二UTC+8下午6时36分17秒，Luc Bourlier写道：