CODEWITHSUNDEEP
scalaobjectruntimetraits
pankajmi
pankajmi

Reputation: 195

Why not giving compilation error?

I have below piece of code

object SubClass extends MyTrait {
  private[this] val a = 10

  def main(args: Array[String]) {
      println(a)
  }

}

trait MyTrait {
  protected val a = 5

}

And it gives following runtime error. Can somebody explain why we didn't catch it in compile time.

Exception in thread "main" java.lang.ClassFormatError: Duplicate field name&signature in class file SubClass$ at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at SubClass.main(TraitTest.scala)

Upvotes: 4

Views: 548

Answers (1)

som-snytt
som-snytt

Reputation: 39577

Because software has bugs?

https://issues.scala-lang.org/browse/SI-7475

That would be my guess.

The related ticket has received recent attention:

https://issues.scala-lang.org/browse/SI-2568

Upvotes: 2

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