https://openjdk.java.net/ 
public interface com.sun.tools.javap.Messages
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.tools.javap.Messages
  super_class: java.lang.Object
{
  public abstract java.lang.String getMessage(java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
    flags: (0x0481) ACC_PUBLIC, ACC_VARARGS, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      key   
      args  

  public abstract java.lang.String getMessage(java.util.Locale, java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/util/Locale;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
    flags: (0x0481) ACC_PUBLIC, ACC_VARARGS, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      locale  
      key     
      args    
}
SourceFile: "Messages.java"