https://openjdk.java.net/ 
public interface com.sun.org.apache.bcel.internal.generic.PopInstruction extends com.sun.org.apache.bcel.internal.generic.StackConsumer
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.org.apache.bcel.internal.generic.PopInstruction
  super_class: java.lang.Object
{
}
SourceFile: "PopInstruction.java"