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Scala reflection does not represent thrown exceptions #7008

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scabug opened this Issue Jan 23, 2013 · 3 comments

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scabug commented Jan 23, 2013

This REPL session explains it the best:

Welcome to Scala version 2.10.0 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

scala> typeOf[java.lang.reflect.Method].member(newTermName("invoke"))
res0: reflect.runtime.universe.Symbol = method invoke

scala> res0.annotations
res1: List[reflect.runtime.universe.Annotation] = List()

The relevant piece of code is in JavaMirrors:

private def jmethodAsScala1(jmeth: jMethod): MethodSymbol = {
      val clazz = sOwner(jmeth)
      val meth = clazz.newMethod(newTermName(jmeth.getName), NoPosition, toScalaMethodFlags(jmeth.getModifiers))
      methodCache enter (jmeth, meth)
      val tparams = jmeth.getTypeParameters.toList map createTypeParameter
      val paramtpes = jmeth.getGenericParameterTypes.toList map typeToScala
      val resulttpe = typeToScala(jmeth.getGenericReturnType)
      setMethType(meth, tparams, paramtpes, resulttpe)
      copyAnnotations(meth, jmeth)
      if ((jmeth.getModifiers & JAVA_ACC_VARARGS) != 0) meth.setInfo(arrayToRepeated(meth.info))
      meth
    }

It forgets to load information about thrown exceptions and synthesize the right annotations.

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scabug commented Jan 23, 2013

Imported From: https://issues.scala-lang.org/browse/SI-7008?orig=1
Reporter: @gkossakowski
Affected Versions: 2.10.0

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scabug commented Jan 31, 2013

@xeno-by said:
Probably should a very easy fix. Will try to get it once we're discussing synchronization.

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scabug commented Jan 31, 2013

@scabug scabug closed this Feb 5, 2013

@scabug scabug added the has PR label Apr 7, 2017

@scabug scabug added this to the 2.10.1 milestone Apr 7, 2017

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