https://github.com/cglib/cglib/cglib: cglib is a powerful, high performance and quality Code Generation Library, It is used to extend JAVA classes and implements interfaces at runtime. 
public abstract class net.sf.cglib.transform.ClassEmitterTransformer extends net.sf.cglib.core.ClassEmitter
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: net.sf.cglib.transform.ClassEmitterTransformer
  super_class: net.sf.cglib.core.ClassEmitter
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // net.sf.cglib.transform.ClassEmitterTransformer this
         0: .line 20
            aload 0 /* this */
            invokespecial net.sf.cglib.core.ClassEmitter.<init>:()V
            return
        end local 0 // net.sf.cglib.transform.ClassEmitterTransformer this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/transform/ClassEmitterTransformer;
}
SourceFile: "ClassEmitterTransformer.java"