Primi passi hibernate
Rustichello da Pisa
sto cercando di capire come funziona Hibernate, ahimè provo da ore
senza il minimo risultato.
Ho installato il plug-in di eclipse Hibernate Syncronizer tramite il
quale ho creato due file xml:
hibernate.cfg.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-
configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >
<!-- local connection properties -->
<property
name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</
property>
<property
name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</
property>
<property name="hibernate.connection.username">angelo</property>
<property name="hibernate.connection.password">palermo</property>
<!-- property name="hibernate.connection.pool_size"></property -->
<!-- dialect for Oracle (any version) -->
<property name="dialect">org.hibernate.dialect.OracleDialect</
property>
<property name="hibernate.show_sql">false</property>
<property
name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</
property>
</session-factory>
</hibernate-configuration>
Person.hbm.xml:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="prova">
<class
name="Person"
table="PERSON"
>
<meta attribute="sync-DAO">true</meta>
<id
name="Id"
type="integer"
column="ID"
>
<generator class="sequence"/>
</id>
<property
name="Firstname"
column="FIRSTNAME"
type="string"
not-null="true"
length="45"
/>
<property
name="Lastname"
column="LASTNAME"
type="string"
not-null="true"
length="45"
/>
</class>
</hibernate-mapping>
Da questi file xml mi vengono generate alcune classi java:
package <<prova>>
classi
-Prova;
package <<prova.base>>:
classi:
-_BaseRootDao;
-BasePerson;
-BasePersonDao;
package <<prova.dao>>:
classi:
-_RootDao;
-PersonDao;
package <<prova.dao.iface>>:
interfaccia:
PersonDao;
Per provare ho creato questa classe qui:
public class Prova {
/**
* @param args
*/
public static void main(String[] args)throws HibernateException {
// TODO Auto-generated method stub
_RootDAO.initialize();
prova.dao.iface.PersonDAO dao = new prova.dao.PersonDAO();
Person nuova = new Person(null, "Alessandro", "Del Piero");
dao.save(nuova);
}
}
Risultato:
Exception in thread "main" org.hibernate.HibernateException:
java.lang.NoClassDefFoundError: javax/transaction/Synchronization
at prova.base._BaseRootDAO.throwException(_BaseRootDAO.java:733)
at prova.base._BaseRootDAO.run(_BaseRootDAO.java:762)
at prova.base._BaseRootDAO.save(_BaseRootDAO.java:605)
at prova.base.BasePersonDAO.save(BasePersonDAO.java:109)
at Prova.main(Prova.java:20)
Caused by: java.lang.NoClassDefFoundError: javax/transaction/
Synchronization
at org.hibernate.impl.SessionImpl.<init>(SessionImpl.java:240)
at org.hibernate.impl.SessionFactoryImpl.openSession
(SessionFactoryImpl.java:503)
at org.hibernate.impl.SessionFactoryImpl.openSession
(SessionFactoryImpl.java:527)
at org.hibernate.impl.SessionFactoryImpl.openSession
(SessionFactoryImpl.java:535)
at prova.base._BaseRootDAO.getSession(_BaseRootDAO.java:64)
at prova.base._BaseRootDAO.getSession(_BaseRootDAO.java:42)
at prova.base._BaseRootDAO.run(_BaseRootDAO.java:743)
... 3 more
Caused by: java.lang.ClassNotFoundException:
javax.transaction.Synchronization
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 10 more
A cosa può essere dovuto il problema?
Grazie a tutti, ciao ciao.
Angelo
> A cosa può essere dovuto il problema?
importa 'jta.jar' al tuo progetto!!
Ciao
Angelo
Piotre Ugrumov
Ciao,
ho importato quel jar ed ora l'errore è questo:
Exception in thread "main" org.hibernate.MappingException: Unknown
entity: prova.Person
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister
(SessionFactoryImpl.java:580)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:
1365)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId
(AbstractSaveEventListener.java:121)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId
(DefaultSaveOrUpdateEventListener.java:210)
at
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId
(DefaultSaveEventListener.java:56)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient
(DefaultSaveOrUpdateEventListener.java:195)
at
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate
(DefaultSaveEventListener.java:50)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate
(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546)
at prova.base._BaseRootDAO.save(_BaseRootDAO.java:619)
at prova.base._BaseRootDAO$1.run(_BaseRootDAO.java:608)
at prova.base._BaseRootDAO.run(_BaseRootDAO.java:745)
at prova.base._BaseRootDAO.save(_BaseRootDAO.java:605)
at prova.base.BasePersonDAO.save(BasePersonDAO.java:109)
at Prova.main(Prova.java:20)
Ma la classe Person esiste, eccola qui:
package prova;
import prova.base.BasePerson;
public class Person extends BasePerson {
private static final long serialVersionUID = 1L;
/*[CONSTRUCTOR MARKER BEGIN]*/
public Person () {
super();
}
/**
* Constructor for primary key
*/
public Person (java.lang.Integer id) {
super(id);
}
/**
* Constructor for required fields
*/
public Person (
java.lang.Integer id,
java.lang.String firstname,
java.lang.String lastname) {
super (
id,
firstname,
lastname);
}
/*[CONSTRUCTOR MARKER END]*/
}
Un altro dubbio nella classe PersonDao non trovo nessun metodo save ma
solo:
package prova.dao;
import org.hibernate.Session;
import prova.base.BasePersonDAO;
public class PersonDAO extends BasePersonDAO implements
prova.dao.iface.PersonDAO {
public PersonDAO () {}
public PersonDAO (Session session) {
super(session);
}
}
Mi sembra strano, non dovrebbe essere implementato il metodo save? Se
si come lo dovrei implementare?
Grazie, ciao ciao.
Angelo
> si come lo dovrei implementare?
> Grazie, ciao ciao.
risolvi tranquillamente leggendo/studiando i manuali sul sito di
hybernate!!!
ciao
Angelo
Piotre Ugrumov
Ciao, io quella guida l'ho letta, come ne ho lette altre ma ahimè ho
capito ben poco dato che il plug-in di eclipse spezza parecchie cose.
Nella classe _BaseRootDAO è definito il save che viene chiamato, non
ho capito come sono suddivisi i vari metodi nelle classi generate in
automatico, ma il comportamente c'è.
package prova.base;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Expression;
import org.hibernate.criterion.Order;
public abstract class _BaseRootDAO {
public _BaseRootDAO () {}
public _BaseRootDAO (Session session) {
setSession(session);
}
protected static Map<String, SessionFactory> sessionFactoryMap;
protected SessionFactory sessionFactory;
protected Session session;
protected final static ThreadLocal<Session> currentSession = new
ThreadLocal<Session>();
/**
* Return a new Session object that must be closed when the work has
been completed.
* @return the active Session
*/
public Session getSession() {
return getSession(
getConfigurationFileName());
}
/**
* Return a new Session object that must be closed when the work has
been completed.
* @param configFile the config file must match the meta attribute
"config-file" in the hibernate mapping file
* @return the active Session
*/
protected Session getSession(String configFile) {
if (null != session && session.isOpen()) return session;
else if (null != sessionFactory) {
Session s = currentSession.get();
if (null == s || !s.isOpen()) {
s = sessionFactory.openSession();
currentSession.set(s);
}
return s;
}
else {
Session s = currentSession.get();
if (null == s || !s.isOpen()) {
s = getSessionFactory(configFile).openSession();
currentSession.set(s);
}
return s;
}
}
public void setSession (Session session) {
this.session = session;
}
/**
* Configure the session factory by reading hibernate config file
*/
public static void initialize () {
prova.dao._RootDAO.initialize(
(String) null);
}
/**
* Configure the session factory by reading hibernate config file
* @param configFileName the name of the configuration file
*/
public static void initialize (String configFileName) {
prova.dao._RootDAO.initialize(
configFileName,
prova.dao._RootDAO.getNewConfiguration(
null));
}
public static void initialize (String configFileName, Configuration
configuration) {
if (null != sessionFactoryMap && null != sessionFactoryMap.get
(configFileName)) return;
else {
if (null == configFileName) {
configuration.configure();
prova.dao._RootDAO.setSessionFactory(
null,
configuration.buildSessionFactory());
}
else {
configuration.configure(
configFileName);
prova.dao._RootDAO.setSessionFactory(
configFileName,
configuration.buildSessionFactory());
}
}
}
/**
* Set the session factory
*/
public void setSessionFactory (SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
/**
* Set the session factory
*/
protected static void setSessionFactory (String configFileName,
SessionFactory sf) {
if (null == configFileName) configFileName = "";
if (null == sessionFactoryMap) sessionFactoryMap = new
HashMap<String, SessionFactory>();
sessionFactoryMap.put(
configFileName,
sf);
}
/**
* Return the SessionFactory that is to be used by these DAOs.
Change this
* and implement your own strategy if you, for example, want to pull
the SessionFactory
* from the JNDI tree.
*/
public SessionFactory getSessionFactory() {
if (null != sessionFactory) return sessionFactory;
else return getSessionFactory(
getConfigurationFileName());
}
public SessionFactory getSessionFactory(String configFileName) {
if (null == configFileName) configFileName = "";
if (null == sessionFactoryMap)
initialize(configFileName);
SessionFactory sf = (SessionFactory) sessionFactoryMap.get
(configFileName);
if (null == sf)
throw new RuntimeException("The session factory for '" +
configFileName + "' has not been initialized (or an error occured
during initialization)");
else
return sf;
}
/**
* Close all sessions for the current thread
*/
public static void closeCurrentSession () {
Session s = currentSession.get();
if (null != s) {
if (s.isOpen()) s.close();
currentSession.set(null);
}
}
/**
* Close the session
*/
public void closeSession (Session session) {
if (null != session) session.close();
}
/**
* Begin the transaction related to the session
*/
public Transaction beginTransaction(Session s) {
return s.beginTransaction();
}
/**
* Commit the given transaction
*/
public void commitTransaction(Transaction t) {
t.commit();
}
/**
* Return a new Configuration to use. This is not a mistake and is
meant
* to be overridden in the RootDAO if you want to do something
different.
* The file name is passed in so you have that to access. The config
file
* is read in the initialize method.
*/
public static Configuration getNewConfiguration (String
configFileName) {
return new Configuration();
}
/**
* Return the name of the configuration file to be used with this DAO
or null if default
*/
public String getConfigurationFileName () {
return null;
}
/**
* Return the specific Object class that will be used for class-
specific
* implementation of this DAO.
* @return the reference Class
*/
protected abstract Class getReferenceClass();
/**
* Used by the base DAO classes but here for your modification
* Get object matching the given key and return it.
*/
protected Object get(Class refClass, Serializable key) {
Session s = null;
try {
s = getSession();
return get(refClass, key, s);
} finally {
closeSession(s);
}
}
/**
* Used by the base DAO classes but here for your modification
* Get object matching the given key and return it.
*/
protected Object get(Class refClass, Serializable key, Session s) {
return s.get(refClass, key);
}
/**
* Used by the base DAO classes but here for your modification
* Load object matching the given key and return it.
*/
protected Object load(Class refClass, Serializable key) {
Session s = null;
try {
s = getSession();
return load(refClass, key, s);
} finally {
closeSession(s);
}
}
/**
* Used by the base DAO classes but here for your modification
* Load object matching the given key and return it.
*/
protected Object load(Class refClass, Serializable key, Session s) {
return s.load(refClass, key);
}
/**
* Return all objects related to the implementation of this DAO with
no filter.
*/
public java.util.List findAll () {
Session s = null;
try {
s = getSession();
return findAll(s);
}
finally {
closeSession(s);
}
}
/**
* Return all objects related to the implementation of this DAO with
no filter.
* Use the session given.
* @param s the Session
*/
public java.util.List findAll (Session s) {
return findAll(s, getDefaultOrder());
}
/**
* Return all objects related to the implementation of this DAO with
no filter.
*/
public java.util.List findAll (Order defaultOrder) {
Session s = null;
try {
s = getSession();
return findAll(s, defaultOrder);
}
finally {
closeSession(s);
}
}
/**
* Return all objects related to the implementation of this DAO with
no filter.
* Use the session given.
* @param s the Session
*/
public java.util.List findAll (Session s, Order defaultOrder) {
Criteria crit = s.createCriteria(getReferenceClass());
if (null != defaultOrder) crit.addOrder(defaultOrder);
return crit.list();
}
/**
* Return all objects related to the implementation of this DAO with
a filter.
* Use the session given.
* @param propName the name of the property to use for filtering
* @param filter the value of the filter
*/
protected Criteria findFiltered (String propName, Object filter) {
return findFiltered(propName, filter, getDefaultOrder());
}
/**
* Return all objects related to the implementation of this DAO with
a filter.
* Use the session given.
* @param propName the name of the property to use for filtering
* @param filter the value of the filter
* @param orderProperty the name of the property used for ordering
*/
protected Criteria findFiltered (String propName, Object filter,
Order order) {
Session s = null;
try {
s = getSession();
return findFiltered(s, propName, filter, order);
}
finally {
closeSession(s);
}
}
/**
* Return all objects related to the implementation of this DAO with
a filter.
* Use the session given.
* @param s the Session
* @param propName the name of the property to use for filtering
* @param filter the value of the filter
* @param orderProperty the name of the property used for ordering
*/
protected Criteria findFiltered (Session s, String propName, Object
filter, Order order) {
Criteria crit = s.createCriteria(getReferenceClass());
crit.add(Expression.eq(propName, filter));
if (null != order) crit.addOrder(order);
return crit;
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* @param name the name of a query defined externally
* @return Query
*/
protected Query getNamedQuery(String name) {
Session s = null;
try {
s = getSession();
return getNamedQuery(name, s);
} finally {
closeSession(s);
}
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the session given.
* @param name the name of a query defined externally
* @param s the Session
* @return Query
*/
protected Query getNamedQuery(String name, Session s) {
Query q = s.getNamedQuery(name);
return q;
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* @param name the name of a query defined externally
* @param param the first parameter to set
* @return Query
*/
protected Query getNamedQuery(String name, Serializable param) {
Session s = null;
try {
s = getSession();
return getNamedQuery(name, param, s);
} finally {
closeSession(s);
}
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the session given.
* @param name the name of a query defined externally
* @param param the first parameter to set
* @param s the Session
* @return Query
*/
protected Query getNamedQuery(String name, Serializable param,
Session s) {
Query q = s.getNamedQuery(name);
q.setParameter(0, param);
return q;
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given.
* @param name the name of a query defined externally
* @param params the parameter array
* @return Query
*/
protected Query getNamedQuery(String name, Serializable[] params) {
Session s = null;
try {
s = getSession();
return getNamedQuery(name, params, s);
} finally {
closeSession(s);
}
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given and the Session given.
* @param name the name of a query defined externally
* @param params the parameter array
* @s the Session
* @return Query
*/
protected Query getNamedQuery(String name, Serializable[] params,
Session s) {
Query q = s.getNamedQuery(name);
if (null != params) {
for (int i = 0; i < params.length; i++) {
q.setParameter(i, params[i]);
}
}
return q;
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given.
* @param name the name of a query defined externally
* @param params the parameter Map
* @return Query
*/
protected Query getNamedQuery(String name, Map params) {
Session s = null;
try {
s = getSession();
return getNamedQuery(name, params, s);
} finally {
closeSession(s);
}
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given and the Session given.
* @param name the name of a query defined externally
* @param params the parameter Map
* @s the Session
* @return Query
*/
protected Query getNamedQuery(String name, Map params, Session s) {
Query q = s.getNamedQuery(name);
if (null != params) {
for (Iterator i=params.entrySet().iterator(); i.hasNext(); ) {
Map.Entry entry = (Map.Entry) i.next();
q.setParameter((String) entry.getKey(), entry.getValue());
}
}
return q;
}
/**
* Execute a query.
* @param queryStr a query expressed in Hibernate's query language
* @return a distinct list of instances (or arrays of instances)
*/
public Query getQuery(String queryStr) {
Session s = null;
try {
s = getSession();
return getQuery(queryStr, s);
} finally {
closeSession(s);
}
}
/**
* Execute a query but use the session given instead of creating a
new one.
* @param queryStr a query expressed in Hibernate's query language
* @s the Session to use
*/
public Query getQuery(String queryStr, Session s) {
return s.createQuery(queryStr);
}
/**
* Execute a query.
* @param query a query expressed in Hibernate's query language
* @param queryStr the name of a query defined externally
* @param param the first parameter to set
* @return Query
*/
protected Query getQuery(String queryStr, Serializable param) {
Session s = null;
try {
s = getSession();
return getQuery(queryStr, param, s);
} finally {
closeSession(s);
}
}
/**
* Execute a query but use the session given instead of creating a
new one.
* @param queryStr a query expressed in Hibernate's query language
* @param param the first parameter to set
* @s the Session to use
* @return Query
*/
protected Query getQuery(String queryStr, Serializable param, Session
s) {
Query q = getQuery(queryStr, s);
q.setParameter(0, param);
return q;
}
/**
* Execute a query.
* @param queryStr a query expressed in Hibernate's query language
* @param params the parameter array
* @return Query
*/
protected Query getQuery(String queryStr, Serializable[] params) {
Session s = null;
try {
s = getSession();
return getQuery(queryStr, params, s);
} finally {
closeSession(s);
}
}
/**
* Execute a query but use the session given instead of creating a
new one.
* @param queryStr a query expressed in Hibernate's query language
* @param params the parameter array
* @s the Session
* @return Query
*/
protected Query getQuery(String queryStr, Serializable[] params,
Session s) {
Query q = getQuery(queryStr, s);
if (null != params) {
for (int i = 0; i < params.length; i++) {
q.setParameter(i, params[i]);
}
}
return q;
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given.
* @param queryStr a query expressed in Hibernate's query language
* @param params the parameter Map
* @return Query
*/
protected Query getQuery(String queryStr, Map params) {
Session s = null;
try {
s = getSession();
return getQuery(queryStr, params, s);
} finally {
closeSession(s);
}
}
/**
* Obtain an instance of Query for a named query string defined in
the mapping file.
* Use the parameters given and the Session given.
* @param queryStr a query expressed in Hibernate's query language
* @param params the parameter Map
* @s the Session
* @return Query
*/
protected Query getQuery(String queryStr, Map params, Session s) {
Query q = getQuery(queryStr, s);
if (null != params) {
for (Iterator i=params.entrySet().iterator(); i.hasNext(); ) {
Map.Entry entry = (Map.Entry) i.next();
q.setParameter((String) entry.getKey(), entry.getValue());
}
}
return q;
}
protected Order getDefaultOrder () {
return null;
}
/**
* Used by the base DAO classes but here for your modification
* Persist the given transient instance, first assigning a generated
identifier.
* (Or using the current value of the identifier property if the
assigned generator is used.)
*/
protected Serializable save(final Object obj) {
return (Serializable) run (
new TransactionRunnable () {
public Object run (Session s) {
return save(obj, s);
}
});
}
/**
* Used by the base DAO classes but here for your modification
* Persist the given transient instance, first assigning a generated
identifier.
* (Or using the current value of the identifier property if the
assigned generator is used.)
*/
protected Serializable save(Object obj, Session s) {
return s.save(obj);
}
/**
* Used by the base DAO classes but here for your modification
* Either save() or update() the given instance, depending upon the
value of its
* identifier property.
*/
protected void saveOrUpdate(final Object obj) {
run (
new TransactionRunnable () {
public Object run (Session s) {
saveOrUpdate(obj, s);
return null;
}
});
}
/**
* Used by the base DAO classes but here for your modification
* Either save() or update() the given instance, depending upon the
value of its
* identifier property.
*/
protected void saveOrUpdate(Object obj, Session s) {
s.saveOrUpdate(obj);
}
/**
* Used by the base DAO classes but here for your modification
* Update the persistent state associated with the given identifier.
An exception is thrown if there is a persistent
* instance with the same identifier in the current session.
* @param obj a transient instance containing updated state
*/
protected void update(final Object obj) {
run (
new TransactionRunnable () {
public Object run (Session s) {
update(obj, s);
return null;
}
});
}
/**
* Used by the base DAO classes but here for your modification
* Update the persistent state associated with the given identifier.
An exception is thrown if there is a persistent
* instance with the same identifier in the current session.
* @param obj a transient instance containing updated state
* @param s the Session
*/
protected void update(Object obj, Session s) {
s.update(obj);
}
/**
* Delete all objects returned by the query
*/
protected int delete (final Query query) {
Integer rtn = (Integer) run (
new TransactionRunnable () {
public Object run (Session s) {
return new Integer(delete((Query) query, s));
}
});
return rtn.intValue();
}
/**
* Delete all objects returned by the query
*/
protected int delete (Query query, Session s) {
List list = query.list();
for (Iterator i=list.iterator(); i.hasNext(); ) {
delete(i.next(), s);
}
return list.size();
}
/**
* Used by the base DAO classes but here for your modification
* Remove a persistent instance from the datastore. The argument may
be an instance associated with the receiving
* Session or a transient instance with an identifier associated with
existing persistent state.
*/
protected void delete(final Object obj) {
run (
new TransactionRunnable () {
public Object run (Session s) {
delete(obj, s);
return null;
}
});
}
/**
* Used by the base DAO classes but here for your modification
* Remove a persistent instance from the datastore. The argument may
be an instance associated with the receiving
* Session or a transient instance with an identifier associated with
existing persistent state.
*/
protected void delete(Object obj, Session s) {
s.delete(obj);
}
/**
* Used by the base DAO classes but here for your modification
* Re-read the state of the given instance from the underlying
database. It is inadvisable to use this to implement
* long-running sessions that span many business tasks. This method
is, however, useful in certain special circumstances.
*/
protected void refresh(Object obj, Session s) {
s.refresh(obj);
}
protected void throwException (Throwable t) {
if (t instanceof HibernateException) throw (HibernateException) t;
else if (t instanceof RuntimeException) throw (RuntimeException) t;
else throw new HibernateException(t);
}
/**
* Execute the given transaction runnable.
*/
protected Object run (TransactionRunnable transactionRunnable) {
Transaction t = null;
Session s = null;
try {
s = getSession();
t = beginTransaction(s);
Object obj = transactionRunnable.run(s);
commitTransaction(t);
return obj;
}
catch (Throwable throwable) {
if (null != t) {
try {
t.rollback();
}
catch (HibernateException e) {handleError(e);}
}
if (transactionRunnable instanceof TransactionFailHandler) {
try {
((TransactionFailHandler) transactionRunnable).onFail(s);
}
catch (Throwable e) {handleError(e);}
}
throwException(throwable);
return null;
}
finally {
closeSession(s);
}
}
/**
* Execute the given transaction runnable.
*/
protected TransactionPointer runAsnyc (TransactionRunnable
transactionRunnable) {
final TransactionPointer transactionPointer = new TransactionPointer
(transactionRunnable);
ThreadRunner threadRunner = new ThreadRunner(transactionPointer);
threadRunner.start();
return transactionPointer;
}
/**
* This class can be used to encapsulate logic used for a single
transaction.
*/
public abstract class TransactionRunnable {
public abstract Object run (Session s) throws Exception;
}
/**
* This class can be used to handle any error that has occured during
a transaction
*/
public interface TransactionFailHandler {
public void onFail (Session s);
}
/**
* This class can be used to handle failed transactions
*/
public abstract class TransactionRunnableFailHandler extends
TransactionRunnable implements TransactionFailHandler {
}
public class TransactionPointer {
private TransactionRunnable transactionRunnable;
private Throwable thrownException;
private Object returnValue;
private boolean hasCompleted = false;
public TransactionPointer (TransactionRunnable transactionRunnable)
{
this.transactionRunnable = transactionRunnable;
}
public boolean hasCompleted() {
return hasCompleted;
}
public void complete() {
this.hasCompleted = true;
}
public Object getReturnValue() {
return returnValue;
}
public void setReturnValue(Object returnValue) {
this.returnValue = returnValue;
}
public Throwable getThrownException() {
return thrownException;
}
public void setThrownException(Throwable thrownException) {
this.thrownException = thrownException;
}
public TransactionRunnable getTransactionRunnable() {
return transactionRunnable;
}
public void setTransactionRunnable(TransactionRunnable
transactionRunnable) {
this.transactionRunnable = transactionRunnable;
}
/**
* Wait until the transaction completes and return the value
returned from the run method of the TransactionRunnable.
* If the transaction throws an Exception, throw that Exception.
* @param timeout the timeout in milliseconds (or 0 for no timeout)
* @return the return value from the TransactionRunnable
* @throws TimeLimitExcededException if the timeout has been reached
before transaction completion
* @throws Throwable the thrown Throwable
*/
public Object waitUntilFinish (long timeout) throws Throwable {
long killTime = -1;
if (timeout > 0) killTime = System.currentTimeMillis() + timeout;
do {
try {
Thread.sleep(50);
}
catch (InterruptedException e) {}
}
while (!hasCompleted && ((killTime > 0 && System.currentTimeMillis
() < killTime) || killTime <= 0));
if (!hasCompleted) throw new javax.naming.TimeLimitExceededException
();
if (null != thrownException) throw thrownException;
else return returnValue;
}
}
private class ThreadRunner extends Thread {
private TransactionPointer transactionPointer;
public ThreadRunner (TransactionPointer transactionPointer) {
this.transactionPointer = transactionPointer;
}
public void run () {
Transaction t = null;
Session s = null;
try {
s = getSession();
t = beginTransaction(s);
Object obj = transactionPointer.getTransactionRunnable().run(s);
t.commit();
transactionPointer.setReturnValue(obj);
}
catch (Throwable throwable) {
if (null != t) {
try {
t.rollback();
}
catch (HibernateException e) {handleError(e);}
}
if (transactionPointer.getTransactionRunnable() instanceof
TransactionFailHandler) {
try {
((TransactionFailHandler)
transactionPointer.getTransactionRunnable()).onFail(s);
}
catch (Throwable e) {handleError(e);}
}
transactionPointer.setThrownException(throwable);
}
finally {
transactionPointer.complete();
try {
closeSession(s);
}
catch (HibernateException e) {
transactionPointer.setThrownException(e);
}
}
}
}
protected void handleError (Throwable t) {
}
}
Ora perchè l'errore:
at prova.base._BaseRootDAO.save(_BaseRootDAO.java:620)
at prova.base._BaseRootDAO$1.run(_BaseRootDAO.java:609)
at prova.base._BaseRootDAO.run(_BaseRootDAO.java:746)
at prova.base._BaseRootDAO.save(_BaseRootDAO.java:606)
at prova.base.BasePersonDAO.save(BasePersonDAO.java:109)
at Prova.main(Prova.java:20)
E' presente, mi scuso per le cose che non riesco a capire nei manuali,
faccio quello che posso.
Grazie, ciao ciao.
Piotre Ugrumov
Mi sono accorto che nel file hibernate.cfg.xml mancava il riferimento
a Person.hbm.xml, che contiene il mapping alla tabella person. Ho
aggiunto il riferimento nel primo file ed ora ottengo un errore
diverso:
Exception in thread "main" org.hibernate.MappingException: invalid
configuration
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:
1521)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1448)
at prova.base._BaseRootDAO.initialize(_BaseRootDAO.java:98)
at prova.base._BaseRootDAO.initialize(_BaseRootDAO.java:88)
at prova.base._BaseRootDAO.initialize(_BaseRootDAO.java:79)
at Prova.main(Prova.java:15)
Caused by: org.xml.sax.SAXParseException: Document is invalid: no
grammar found.
at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException
(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error
(ErrorHandlerWrapper.java:131)
at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError
(XMLErrorReporter.java:384)
at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError
(XMLErrorReporter.java:318)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement
(XMLNSDocumentScannerImpl.java:250)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl
$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:
626)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl
$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3095)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl
$PrologDriver.next(XMLDocumentScannerImpl.java:921)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next
(XMLDocumentScannerImpl.java:648)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next
(XMLNSDocumentScannerImpl.java:140)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument
(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse
(XML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse
(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse
(XMLParser.java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse
(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl
$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:
1518)
... 6 more
Mi viene detto invalid configuration, ma tutta la configurazione è
stata effettuata in automatico dal tool.
I file xml sono:
hibernate.cfg.xml:
<hibernate-configuration>
<session-factory>
<!-- local connection properties -->
<property name="hibernate.connection.url">
jdbc:oracle:thin:@localhost:1521:xe
</property>
<property name="hibernate.connection.driver_class">
oracle.jdbc.OracleDriver
</property>
<property name="hibernate.connection.username">angelo</property>
<property name="hibernate.connection.password">palermo</property>
<!-- property name="hibernate.connection.pool_size"></property -->
<!-- dialect for Oracle (any version) -->
<property name="dialect">
org.hibernate.dialect.OracleDialect
</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.transaction.factory_class">
org.hibernate.transaction.JDBCTransactionFactory
</property>
<mapping resource="hibernate.cfg.xml" />
<mapping resource="Person.hbm.xml" />
</session-factory>
</hibernate-configuration>
</class>
</hibernate-mapping>
Dove può essere l'errore?
Piotre Ugrumov
Ciao,
sono riuscito a risolvere, mi sono accorto che in hibernate.cfg.xml
mancava la dichiarazione della dtd.
Ho aggiunto:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-
configuration-3.0.dtd">
e tutto funziona.
Grazie ancora, ciao ciao.
Manuel T
> Ciao,
> ho importato quel jar ed ora l'errore è questo:
> Exception in thread "main" org.hibernate.MappingException: Unknown
> entity: prova.Person
Secondo me non hai incluso il mapping di questa classe nella configurazione.