https://openjdk.java.net/ 
public interface javax.security.auth.callback.CallbackHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.security.auth.callback.CallbackHandler
  super_class: java.lang.Object
{
  public abstract void handle(javax.security.auth.callback.Callback[]);
    descriptor: ([Ljavax/security/auth/callback/Callback;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException, javax.security.auth.callback.UnsupportedCallbackException
    MethodParameters:
           Name  Flags
      callbacks  
}
SourceFile: "CallbackHandler.java"