I'll send you my version:
package hibernate;
import java.beans.PropertyDescriptor;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.List;
import org.apache.commons.beanutils.PropertyUtils;
import org.hibernate.EntityMode;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.metadata.ClassMetadata;
import org.hibernate.proxy.HibernateProxyHelper;
import java.io.Serializable;
import java.sql.Blob;
import java.util.*;
import org.apache.log4j.Logger;
import org.hibernate.proxy.HibernateProxy;
public class HibernateCleaner {
private static final Logger logger =
Logger.getLogger(HibernateCleaner.class);
public static Object clean(Session session, Object obj) throws Exception
{
return (clean(session, obj, new HashMap<Integer, Object>()));
}
private static Object clean(Session session,
Object obj,
Map<Integer, Object> visitedObjects) throws
Exception {
Object newObj;
Map.Entry m;
Class clazz;
Object[] array;
Collection collection;
Map map;
PropertyDescriptor[] descriptors;
String property;
ClassMetadata clazzMetaData;
int index, length, hashCode;
if (obj == null)
return (null);
if ((obj instanceof Boolean) || (obj instanceof Number) ||
(obj instanceof Character) || (obj instanceof String) ||
(obj instanceof Blob) || (obj instanceof InputStream))
return (obj);
if (obj instanceof Date)
return (new Date (((Date) obj).getTime()));
if (obj instanceof Calendar)
return (((Calendar) obj).clone());
if (obj instanceof Object[]) {
array = (Object[]) ((Object[]) obj).clone();
length = array.length;
for (index = 0; index < length; index++)
array[index] = clean(session, array[index], visitedObjects);
return (array);
}
if (obj instanceof Object[]) {
array = (Object[]) ((Object[]) obj).clone();
length = array.length;
for (index = 0; index < length; index++)
array[index] = clean(session, array[index], visitedObjects);
return (array);
}
if (obj instanceof Collection) {
collection = createCollection((Collection) obj);
if (Hibernate.isInitialized(obj)) {
for (Object member: (Collection) obj)
collection.add (clean(session, member, visitedObjects));
}
return (collection);
}
if (obj instanceof Map) {
map = createMap((Map) obj);
if (Hibernate.isInitialized(obj)) {
for (Object member: ((Map)obj).entrySet()) {
m = (Map.Entry) member;
clean(session, m.getKey(), visitedObjects);
clean(session, m.getValue(), visitedObjects);
map.put (m.getKey(), m.getValue());
}
}
return (map);
}
hashCode = System.identityHashCode(obj);
if (visitedObjects.containsKey(hashCode))
return visitedObjects.get(hashCode);
if (obj instanceof HibernateProxy) {
clazz =
HibernateProxyHelper.getClassWithoutInitializingProxy(obj);
newObj = clazz.newInstance();
}
else
newObj = obj.getClass().newInstance();
visitedObjects.put(hashCode, newObj);
if (!Hibernate.isInitialized(obj)) {
if (session != null) {
clazzMetaData =
session.getSessionFactory().getClassMetadata(newObj.getClass());
Serializable id = clazzMetaData.getIdentifier(obj,
EntityMode.POJO);
clazzMetaData.setIdentifier(newObj, id, EntityMode.POJO);
}
} else {
descriptors = PropertyUtils.getPropertyDescriptors(newObj);
length = descriptors.length;
for (index = 0; index < length; index++) {
property = descriptors[index].getName();
if (!property.equals("class")) {
try {
PropertyUtils.setProperty(newObj, property,
clean(session,
PropertyUtils.getProperty(obj, property), visitedObjects));
} catch (NoSuchMethodException e) {
}
}
}
}
return (newObj);
}
private static Collection createCollection(Collection obj) throws
Exception {
Collection newObj = null;
if (obj instanceof SortedSet)
newObj = new TreeSet ();
else if (obj instanceof Set)
newObj = new HashSet ();
else
newObj = new ArrayList ();
return (newObj);
}
private static Map createMap(Map obj) throws Exception {
Map newObj = null;
if (obj instanceof SortedMap)
newObj = new TreeMap ();
else
newObj = new HashMap ();
return (newObj);
}
}
Regards,
Néstor Boscán
On Thu, Jan 27, 2011 at 2:15 AM, Nagin Kothari <[email protected]>wrote:
>
> Hi,
> Can you point to some link that provide sample code or utility to clean the
> Hibernate POJO (Hibernate Cleaner class) as you have mentioned in this mail.
> It would greately help me too.
>
> Thanks in advance,
>
> Nagin
> 2011/1/26 Néstor Boscán <[email protected]>
>
>> This is very tipical in Hibernate applications that have to serialize
>> objects through the network be it GWT, Web Services, JSON, etc. Hibernate
>> will leave his own POJO in your objects for lazy initialization purposes.
>> When GWT or a Web Service tries to serialize the objects and opens the
>> hibernate POJO it will throw LazyInitializationException because the
>> connection is already closed. What I've done in my applications is to clean
>> the POJO of any Hibernate references. This is done with a Hibernate Cleaner
>> class. On the web there are a couple of examples of this.
>>
>> Regards,
>>
>> Néstor Boscán
>>
>> On Tue, Jan 25, 2011 at 2:33 PM, Debashish <[email protected]>wrote:
>>
>>> Hi
>>>
>>> I am trying for a sample using GWT and database layer as Hibernate
>>> with Oracle on Google Aps server.
>>>
>>> I have done a sample for Hibernate with JSP as presentation layer,
>>> which is working fine.
>>> But the same approach is not working with GWT.
>>>
>>> Here is a verygood link on this topic
>>>
>>> http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html
>>> and my approach is almost similar.
>>>
>>> I have followed the below approach,
>>> The RemoteServiceServlet makes a call to Hibernate layer and tries the
>>> initializes the SessionFactory as below,
>>> sessionFactory = new
>>> Configuration().configure().buildSessionFactory();
>>>
>>> I have added the jars necessary for the Hibernate layer (and
>>> classes12.jar for oracle driver).
>>>
>>> However while running , it is giving me an error as below,
>>>
>>> --------------------------------------------------------------------------------------------------------
>>> Initial SessionFactory creation failed.java.lang.NoClassDefFoundError:
>>> java.net.Socket is a restricted class. Please see the Google App
>>> Engine developer's guide for more details.
>>> [ERROR] javax.servlet.ServletContext log: Exception while dispatching
>>> incoming RPC call
>>> com.google.gwt.user.server.rpc.UnexpectedException: Service method
>>> 'public abstract java.lang.Long
>>>
>>> com.google.musicstore.client.MusicStoreService.saveAccount(com.google.musicstore.client.dto.AccountDTO)'
>>> threw an unexpected exception: java.lang.ExceptionInInitializerError
>>> at
>>> com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
>>> 378)
>>>
>>> --------------------------------------------------------------------------------------------------------
>>> I have one through some of the threads which suggested me to download
>>> the google apps jar files and try it. I have downladed it. but there
>>> is no proper direction on how to make use of which jar file.
>>>
>>> Have anybody tried the same. Please let me know if anything I am doing
>>> wrong.
>>> *** Note that I am using Oracle 9.2 as local database.
>>>
>>> Thanks
>>> Dev
>>>
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>>>
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>
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