Using unboundid ldap in scala … strange compile error

Question

I am trying to use LDAP via unboundid in scala but the compiler keeps crashing.

I just created an object that looks like this:

package utils

import com.unboundid.ldap.sdk._

object LdapHelper {
  val ldap = LDAPConnection("ldap.example.com", 389)
}

I added this: "com.unboundid" % "unboundid-ldapsdk" % "2.3.1" to my appDependencies in Build.scala. I use Play 2.1 and Scala Version 2.10.1.

I get a very strange error message (see below):

The error message is so strange that i really dont know where to begin to look for hints. Not sure if the problem is in unboundid, play, scala, sbt?

How can i successfully integrate unboundid in my scala project?

Thanks

Error in Scala compiler: assertion failed: while compiling: C:\play\todolist\app\utils\LdapHelper.scala during phase: global=typer, atPhase=parser library version: version 2.10.2 compiler version: version 2.10.2 reconstructed args: -classpath C:\play\todolist.target;C:\eclipse\scala-SDK-3.0.1-vfinal-2.10-win32.win32.x86_64\configuration\org.eclipse.

...

last tree to typer: Ident(LDAPConnection) symbol: (flags: ) symbol definition: symbol owners: context owners: value ldap -> object LdapHelper -> package utils

== Enclosing template or block ==

Template( // val : in object LdapHelper "java.lang.Object" // parents ValDef( private "_" ) // 3 statements DefDef( // def : in object LdapHelper "" [] List(Nil) Block( Apply( super."" Nil ) () ) ) DefDef( // def x: in object LdapHelper "x" [] Nil () ) ValDef( // private[this] val ldap: in object LdapHelper private "ldap" Apply( "LDAPConnection" // 2 arguments "ldap.example.com" 389 ) ) )

jeckhart jeckhart · Accepted Answer · 2013-10-24T03:56:55

There was a warning that turned into an assert in Scala 2.10.2 causing this.

There is a bug open here: https://issues.scala-lang.org/browse/SI-7014

And a fix staged for 2.10.4: https://github.com/scala/scala/pull/2829

You can ask Play to use Scala 2.10.4-SNAPSHOT by using the following Build.scala:

import sbt._
import Keys._
import play.Project._

object ApplicationBuild extends Build {

    val appName         = "AppName"
    val appVersion      = "1.0-SNAPSHOT"

    val mainDeps = Seq(
      jdbc,
      anorm,
      cache
    )

    lazy  val main = play.Project(appName, appVersion, mainDeps).settings(
      scalaVersion := "2.10.4-SNAPSHOT"
    )

}

If you are using build.sbt the file would look like:

import play.Project._

playScalaSettings

name := "AppName"

version := "1.0-SNAPSHOT"

scalaVersion := "2.10.4-SNAPSHOT"

libraryDependencies ++= Seq(jdbc, anorm, cache)

Note: if building from sbt (instead of play) you may have to add a repository resolver under the scalaVersion line such as: resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/repo/"

Using unboundid ldap in scala … strange compile error

2 Answers