Hello guys, I need to read the kotlin metadata fro...

# compiler

[Marco Signoretto]

Hello guys, I need to read the kotlin metadata from a .class . The interface I want to read the metadata from is

interface PippoSample {
    fun showRandom(): Boolean
    fun sayHi()
    fun sayHiWith(param: String)
}

if I run javap -v PippoSample.class I can see that the metadata is present into the .class :

Last modified Sep 2, 2020; size 682 bytes
  MD5 checksum 6aed5c3b65bca7ea5739b7d8f2638920
  Compiled from "PippoSample.kt"
public interface com.careem.mockingbird.samples.PippoSample
  minor version: 0
  major version: 50
  flags: ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
Constant pool:
   #1 = Utf8               com/careem/mockingbird/samples/PippoSample
   #2 = Class              #1             // com/careem/mockingbird/samples/PippoSample
   #3 = Utf8               java/lang/Object
   #4 = Class              #3             // java/lang/Object
   #5 = Utf8               showRandom
   #6 = Utf8               ()Z
   #7 = Utf8               this
   #8 = Utf8               Lcom/careem/mockingbird/samples/PippoSample;
   #9 = Utf8               sayHi
  #10 = Utf8               ()V
  #11 = Utf8               sayHiWith
  #12 = Utf8               (Ljava/lang/String;)V
  #13 = Utf8               Lorg/jetbrains/annotations/NotNull;
  #14 = Utf8               param
  #15 = Utf8               Ljava/lang/String;
  #16 = Utf8               Lkotlin/Metadata;
  #17 = Utf8               mv
  #18 = Integer            1
  #19 = Integer            16
  #20 = Utf8               bv
  #21 = Integer            0
  #22 = Integer            3
  #23 = Utf8               k
  #24 = Utf8               d1
  #25 = Utf8               \n\n\n\n\\n\n\n
                                          \f200H&J020H&H&¨\t
  #26 = Utf8               d2
  #27 = Utf8
  #28 = Utf8               samples
  #29 = Utf8               PippoSample.kt
  #30 = Utf8               RuntimeInvisibleParameterAnnotations
  #31 = Utf8               SourceFile
  #32 = Utf8               RuntimeVisibleAnnotations
{
  public abstract boolean showRandom();
    descriptor: ()Z
    flags: ACC_PUBLIC, ACC_ABSTRACT

  public abstract void sayHi();
    descriptor: ()V
    flags: ACC_PUBLIC, ACC_ABSTRACT

  public abstract void sayHiWith(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: ACC_PUBLIC, ACC_ABSTRACT
    RuntimeInvisibleParameterAnnotations:
      0:
        0: #13()
}
SourceFile: "PippoSample.kt"
RuntimeVisibleAnnotations:
  0: #16(#17=[I#18,I#18,I#19],#20=[I#18,I#21,I#22],#23=I#18,#24=[s#25],#26=[s#8,s#27,s#9,s#27,s#11,s#14,s#27,s#5,s#27,s#28])

Then from code I want to read the metadata information, I was doing the following:

val file = File("<long_path>/build/classes/kotlin/jvm/main")
val url = file.toURI().toURL()
val urls = arrayOf(url)
val cl = URLClassLoader(urls)

val externalClass = cl.loadClass("com.careem.mockingbird.samples.PippoSample")
println(externalClass.getAnnotation(Metadata::class.java))

But I got null in the printed values. If I add other annotations on the interface I'll get them but no way I get the @Metadata. Anyone can help?