https://openjdk.java.net/ 
public interface java.lang.Thread$UncaughtExceptionHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.lang.Thread$UncaughtExceptionHandler
  super_class: java.lang.Object
{
  public abstract void uncaughtException(java.lang.Thread, java.lang.Throwable);
    descriptor: (Ljava/lang/Thread;Ljava/lang/Throwable;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      t     
      e     
}
SourceFile: "Thread.java"
NestHost: java.lang.Thread
InnerClasses:
  public abstract UncaughtExceptionHandler = java.lang.Thread$UncaughtExceptionHandler of java.lang.Thread
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()