Strange problem with Scala 2.10

[Jiakui Wang]

I got the variable c from previous code, and it behaves very strangely:

scala> c.asInstanceOf[Map[String, Any]].keys

res24: Iterable[String] = Set("label", "features")

scala> c.asInstanceOf[Map[String, Any]].apply("features")

java.util.NoSuchElementException: key not found: features

at scala.collection.MapLike$class.default(MapLike.scala:228)

at scala.collection.AbstractMap.default(Map.scala:58)

at scala.collection.MapLike$class.apply(MapLike.scala:141)

at scala.collection.AbstractMap.apply(Map.scala:58)

at .<init>(<console>:14)

at .<clinit>(<console>)

at .<init>(<console>:7)

at .<clinit>(<console>)

at $print(<console>)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:734)

at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:983)

at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:573)

at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:604)

at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:568)

at scala.tools.nsc.interpreter.ILoop.reallyInterpret$1(ILoop.scala:760)

at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:805)

at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:717)

at scala.tools.nsc.interpreter.ILoop.processLine$1(ILoop.scala:581)

at scala.tools.nsc.interpreter.ILoop.innerLoop$1(ILoop.scala:588)

at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:591)

at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:882)

at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:837)

at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:837)

at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)

at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:837)

at scala.tools.nsc.interpreter.ILoop.main(ILoop.scala:904)

at xsbt.ConsoleInterface.run(ConsoleInterface.scala:69)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:102)

at sbt.compiler.AnalyzingCompiler.console(AnalyzingCompiler.scala:77)

at sbt.Console.sbt$Console$$console0$1(Console.scala:23)

at sbt.Console$$anonfun$apply$2$$anonfun$apply$1.apply$mcV$sp(Console.scala:24)

at sbt.TrapExit$.sbt$TrapExit$$executeMain$1(TrapExit.scala:33)

at sbt.TrapExit$$anon$1.run(TrapExit.scala:42)

Any idea about the problem?

Thanks

[Oliver Ruebenacker]

     Hello,

  Normally, REPL does not put quotations around Strings, or does it? So the quotation marks are part of the Strings, then, right? Try:

c.asInstanceOf[Map[String, Any]].apply("\"features\"")

  If it's not that, I would try println(c.getClass) and println(c).

  And:

  val map = c.asInstanceOf[Map[String, Any]]

  map(map.keys.head)

     Best, Oliver

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Oliver Ruebenacker

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Be always grateful, but never satisfied.

[Jon Pretty]

Hi Oliver,

I think the heuristic is that the REPL puts quotes around strings if they start or end with whitespace.

Cheers,
Jon

[Jiakui Wang]

Hi Oliver,

The problem is that the map was like c=Map("\"lable\"" -> "" ), I didn't notice that, therefore I got confused.

Thanks!