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.core.ClassGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: net.sf.cglib.core.ClassGenerator
  super_class: java.lang.Object
{
  public abstract void generateClass(org.objectweb.asm.ClassVisitor);
    descriptor: (Lorg/objectweb/asm/ClassVisitor;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      v     
}
SourceFile: "ClassGenerator.java"