Stuff generated for an empty class...

gistfile1.txt

groovyquestion $ cat Demo.groovy 
class Demo {
    // this is an empty class
}
groovyquestion $ 
groovyquestion $ groovyc Demo.groovy 
groovyquestion $ 
groovyquestion $ javap -private Demo
Compiled from "Demo.groovy"
public class Demo implements groovy.lang.GroovyObject {
  private static org.codehaus.groovy.reflection.ClassInfo $staticClassInfo;
  public static transient boolean __$stMC;
  private transient groovy.lang.MetaClass metaClass;
  public static long __timeStamp;
  public static long __timeStamp__239_neverHappen1402596739220;
  private static java.lang.ref.SoftReference $callSiteArray;
  public Demo();
  public java.lang.Object this$dist$invoke$1(java.lang.String, java.lang.Object);
  public void this$dist$set$1(java.lang.String, java.lang.Object);
  public java.lang.Object this$dist$get$1(java.lang.String);
  protected groovy.lang.MetaClass $getStaticMetaClass();
  public groovy.lang.MetaClass getMetaClass();
  public void setMetaClass(groovy.lang.MetaClass);
  public java.lang.Object invokeMethod(java.lang.String, java.lang.Object);
  public java.lang.Object getProperty(java.lang.String);
  public void setProperty(java.lang.String, java.lang.Object);
  public static void __$swapInit();
  static {};
  public void super$1$wait();
  public java.lang.String super$1$toString();
  public void super$1$wait(long);
  public void super$1$wait(long, int);
  public void super$1$notify();
  public void super$1$notifyAll();
  public java.lang.Class super$1$getClass();
  public java.lang.Object super$1$clone();
  public boolean super$1$equals(java.lang.Object);
  public int super$1$hashCode();
  public void super$1$finalize();
  private static org.codehaus.groovy.runtime.callsite.CallSiteArray $createCallSiteArray();
  private static org.codehaus.groovy.runtime.callsite.CallSite[] $getCallSiteArray();
  static java.lang.Class class$(java.lang.String);
}
groovyquestion $