https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
public final class org.graalvm.nativeimage.Platform$HOSTED_ONLY implements org.graalvm.nativeimage.Platform
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.graalvm.nativeimage.Platform$HOSTED_ONLY
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.nativeimage.Platform$HOSTED_ONLY this
         0: .line 363
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 364
            return
        end local 0 // org.graalvm.nativeimage.Platform$HOSTED_ONLY this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/nativeimage/Platform$HOSTED_ONLY;
}
SourceFile: "Platform.java"
NestHost: org.graalvm.nativeimage.Platform
InnerClasses:
  public final HOSTED_ONLY = org.graalvm.nativeimage.Platform$HOSTED_ONLY of org.graalvm.nativeimage.Platform