package tutorial.dev.lazy;import java.util.HashSet;import java.util.Iterator;import net.sf.hibernate.HibernateException;import net.sf.hibernate.LazyInitializationException;import net.sf.hibernate.LockMode;import net.sf.hibernate.Session;import net.sf.hibernate.SessionFactory;import net.sf.hibernate.Transaction;import net.sf.hibernate.cfg.Configuration;public class LazyDevDemo {	public static void main(String[] args) {		try {			new LazyDevDemo();		} catch(HibernateException he) {			he.printStackTrace();		}	}		public LazyDevDemo() throws HibernateException {		Configuration config = new Configuration();		// add the classes you want to persist		// make sure the mapping files are on the classpath		config.addClass(InLazySet.class);		config.addClass(WithLazySet.class);		SessionFactory sf = config.buildSessionFactory();					for (int i = 0; i < 100 ; i++) {		Session sess = sf.openSession();		Transaction tx = null;		// store the orderlist and all products				WithLazySet l = new WithLazySet();		l.setLazy(new HashSet());		l.getLazy().add(new InLazySet());		l.getLazy().add(new InLazySet());		l.getLazy().add(new InLazySet());		l.getLazy().add(new InLazySet());		l.getLazy().add(new InLazySet());		l.getLazy().add(new InLazySet());		try {			tx = sess.beginTransaction();			sess.save(l);			tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		} 		finally {		    sess.close();		}		System.out.println("Wrote dummy data");		/*		sess = sf.openSession();		tx = null;		try {			tx = sess.beginTransaction();			System.out.println("Loading and accessing in the same session");			WithLazySet l2 = (WithLazySet) sess.get(WithLazySet.class, l.getId());			for (Iterator iter = l2.getLazy().iterator(); iter.hasNext();) {				InLazySet lazy = (InLazySet) iter.next();				System.out.println("loaded: " + lazy.getId());			}			tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		}		finally {		    sess.close();		}		*/		/*		System.out.println("Loading, closing and accessing");		sess = sf.openSession();		tx = null;		WithLazySet l3 = null;		try {			tx = sess.beginTransaction();			l3 = (WithLazySet) sess.get(WithLazySet.class, l.getId());					tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		}		finally {		    sess.close();		}		// should trow exception		try {			for (Iterator iter = l3.getLazy().iterator(); iter.hasNext();) {				InLazySet lazy = (InLazySet) iter.next();				System.out.println("loaded: " + lazy.getId());			}			// getting ugly...junit would not have been that bad ;-)			throw new RuntimeException("must not be here");		} catch(LazyInitializationException lie) {			System.out.println("Caught expected lazyinit exception");		}		*/		// with reatach		System.out.println("Reatach and accessing");		System.out.println("load L4");		sess = sf.openSession();		tx = null;		WithLazySet l4 = null;		try {			tx = sess.beginTransaction();			l4 = (WithLazySet) sess.get(WithLazySet.class, l.getId());					tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		}		finally {		    sess.close();		}		System.out.println("reatach");		sess = sf.openSession();		tx = null;		try {			tx = sess.beginTransaction();			//sess.lock(l4, LockMode.NONE);			sess.update(l4);			System.out.println("locked");			for (Iterator iter = l4.getLazy().iterator(); iter.hasNext();) {				InLazySet lazy = (InLazySet) iter.next();				System.out.println("loaded: " + lazy.getId());			}									tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		}		finally {		    sess.close();		}		/*		// with disconnect		System.out.println("disconnect/connect and accessing");		sess = sf.openSession();		tx = null;		WithLazySet l5 = null;		try {			tx = sess.beginTransaction();			l5 = (WithLazySet) sess.get(WithLazySet.class, l.getId());										tx.commit();		} catch (HibernateException e) {		    if (tx!=null) tx.rollback();		    throw e;		}		finally {		    sess.disconnect();		}				sess.reconnect();				for (Iterator iter = l5.getLazy().iterator(); iter.hasNext();) {			InLazySet lazy = (InLazySet) iter.next();			System.out.println("loaded: " + lazy.getId());		}		sess.close();		*/		try {		Thread.sleep(5000);		} catch(InterruptedException ie) {			ie.printStackTrace();		}		System.out.println("Next round");		}	}	}