https://www.graalvm.org/ 
public final class com.oracle.truffle.js.runtime.java.JavaPackageObject extends com.oracle.truffle.js.runtime.objects.JSNonProxyObject
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.java.JavaPackageObject
  super_class: com.oracle.truffle.js.runtime.objects.JSNonProxyObject
{
  private final java.lang.String packageName;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  protected void <init>(com.oracle.truffle.api.object.Shape, java.lang.String);
    descriptor: (Lcom/oracle/truffle/api/object/Shape;Ljava/lang/String;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.java.JavaPackageObject this
        start local 1 // com.oracle.truffle.api.object.Shape shape
        start local 2 // java.lang.String packageName
         0: .line 50
            aload 0 /* this */
            aload 1 /* shape */
            invokespecial com.oracle.truffle.js.runtime.objects.JSNonProxyObject.<init>:(Lcom/oracle/truffle/api/object/Shape;)V
         1: .line 51
            aload 0 /* this */
            aload 2 /* packageName */
            putfield com.oracle.truffle.js.runtime.java.JavaPackageObject.packageName:Ljava/lang/String;
         2: .line 52
            return
        end local 2 // java.lang.String packageName
        end local 1 // com.oracle.truffle.api.object.Shape shape
        end local 0 // com.oracle.truffle.js.runtime.java.JavaPackageObject this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    3     0         this  Lcom/oracle/truffle/js/runtime/java/JavaPackageObject;
            0    3     1        shape  Lcom/oracle/truffle/api/object/Shape;
            0    3     2  packageName  Ljava/lang/String;
    MethodParameters:
             Name  Flags
      shape        
      packageName  

  public java.lang.String getPackageName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.java.JavaPackageObject this
         0: .line 55
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.java.JavaPackageObject.packageName:Ljava/lang/String;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.java.JavaPackageObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/java/JavaPackageObject;
}
SourceFile: "JavaPackageObject.java"