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Reflective access to parametrized type info not available #1395

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scabug opened this issue Oct 1, 2008 · 4 comments
Closed

Reflective access to parametrized type info not available #1395

scabug opened this issue Oct 1, 2008 · 4 comments
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scabug commented Oct 1, 2008 

import java.lang.reflect._

/*
 * Version: Scala 2.7.2-RC2
 * Prints: Parameterized type info not available
 */
object GenTypeTest extends Application {
  val f = classOf[foo].getDeclaredField("l")
  val gtype = f.getGenericType
  if (gtype.isInstanceOf[ParameterizedType]) {
    val typeArgs = gtype.asInstanceOf[ParameterizedType].getActualTypeArguments
    println("type args " + typeArgs)
  } else {
    println("Parameterized type info not available");
  }
}

class foo {
  val l: List[Int] = null
}
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scabug commented Oct 1, 2008

Imported From: https://issues.scala-lang.org/browse/SI-1395?orig=1
Reporter: Joni Freeman (inhuman)

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scabug commented Oct 29, 2008

Derek (dereki) said:
This is stopping us using Jersey https://jersey.dev.java.net/ @context provider functionality.
We will work around this by using Java to wrap for the moment.

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scabug commented Mar 23, 2009

Rob (rbygrave) said:
In my opinion this is an important bug for using ORM frameworks - so I'm wondering why it has not been fixed?

That is, ORM frameworks will use reflection on properties/fields to determine the parameter type.

Using ASM bytecode outline it seems that the Scala compiler is leaving off the generics parameter type in the field definition. I'm not sure how that translates to the scala compiler.

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scabug commented Mar 24, 2009

@dragos said:
Scalac should generate java signatures for private members now (r17376).

@scabug scabug closed this as completed May 18, 2011
This was referenced Apr 6, 2017
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