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 interface net.sf.cglib.transform.ClassTransformerFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: net.sf.cglib.transform.ClassTransformerFactory
  super_class: java.lang.Object
{
  public abstract net.sf.cglib.transform.ClassTransformer newInstance();
    descriptor: ()Lnet/sf/cglib/transform/ClassTransformer;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ClassTransformerFactory.java"