Problema com VRaptor / Hibernate

gutomarzagao · Março 1, 2014, 2:18pm

Oi pessoal,

Eu tenho uma aplicação que está dando problema após ficar algum tempo no ar. Depois de algum tempo com o servidor no ar, dá o seguinte erro:

[code]org.hibernate.exception.JDBCConnectionException: could not prepare statement
org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:67)
org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:188)
org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1859)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
org.hibernate.loader.Loader.doQuery(Loader.java:900)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
org.hibernate.loader.Loader.doList(Loader.java:2526)
org.hibernate.loader.Loader.doList(Loader.java:2512)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
org.hibernate.loader.Loader.list(Loader.java:2337)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124)
org.hibernate.internal.SessionImpl.list(SessionImpl.java:1668)
org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)
br.com.metamorfosevirtual.daos.ConvenioDao.visualizar(ConvenioDao.java:23)
br.com.metamorfosevirtual.interceptors.DaoInterceptor.intercept(DaoInterceptor.java:32)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:67)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.metamorfosevirtual.interceptors.HibernateInterceptor.intercept(HibernateInterceptor.java:30)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:93)
br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:82)
br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:99)
root cause

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
com.mysql.jdbc.Util.getInstance(Util.java:386)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1304)
com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1296)
com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4511)
com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4476)
org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:161)
org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182)
org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1859)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
org.hibernate.loader.Loader.doQuery(Loader.java:900)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
org.hibernate.loader.Loader.doList(Loader.java:2526)
org.hibernate.loader.Loader.doList(Loader.java:2512)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
org.hibernate.loader.Loader.list(Loader.java:2337)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124)
org.hibernate.internal.SessionImpl.list(SessionImpl.java:1668)
org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)
br.com.metamorfosevirtual.daos.ConvenioDao.visualizar(ConvenioDao.java:23)
br.com.metamorfosevirtual.interceptors.DaoInterceptor.intercept(DaoInterceptor.java:32)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:67)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.metamorfosevirtual.interceptors.HibernateInterceptor.intercept(HibernateInterceptor.java:30)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:93)
br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:82)
br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:99)
root cause

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 29,362,473 milliseconds ago. The last packet sent successfully to the server was 6 milliseconds ago.
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3603)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3492)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4043)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2322)
org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:56)
org.hibernate.loader.Loader.getResultSet(Loader.java:2040)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
org.hibernate.loader.Loader.doQuery(Loader.java:900)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
org.hibernate.loader.Loader.doList(Loader.java:2526)
org.hibernate.loader.Loader.doList(Loader.java:2512)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
org.hibernate.loader.Loader.list(Loader.java:2337)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124)
org.hibernate.internal.SessionImpl.list(SessionImpl.java:1668)
org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)
br.com.metamorfosevirtual.daos.ConvenioDao.visualizar(ConvenioDao.java:23)
br.com.metamorfosevirtual.interceptors.DaoInterceptor.intercept(DaoInterceptor.java:32)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:67)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.metamorfosevirtual.interceptors.HibernateInterceptor.intercept(HibernateInterceptor.java:30)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:93)
br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:82)
br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:99)
root cause

java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3052)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3503)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3492)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4043)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2322)
org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:56)
org.hibernate.loader.Loader.getResultSet(Loader.java:2040)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837)
org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
org.hibernate.loader.Loader.doQuery(Loader.java:900)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
org.hibernate.loader.Loader.doList(Loader.java:2526)
org.hibernate.loader.Loader.doList(Loader.java:2512)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
org.hibernate.loader.Loader.list(Loader.java:2337)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124)
org.hibernate.internal.SessionImpl.list(SessionImpl.java:1668)
org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)
br.com.metamorfosevirtual.daos.ConvenioDao.visualizar(ConvenioDao.java:23)
br.com.metamorfosevirtual.interceptors.DaoInterceptor.intercept(DaoInterceptor.java:32)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:67)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.metamorfosevirtual.interceptors.HibernateInterceptor.intercept(HibernateInterceptor.java:30)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:93)
br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:82)
br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:99)[/code]

O estranho é que minha aplicação funciona sem problemas por um bom tempo. Mas depois de uns 3 dias com o site no ar (as vezes até mais), dá algum erro interno e essa exceção é lançada em qualquer request. Eu acho que o Vraptor está se perdendo com as conexões do banco de dados. Eu estou criando as conexões da seguinte forma:

Session Factory:

[code]@Component
@ApplicationScoped
public class HibernateSessionFactory implements
ComponentFactory {

private SessionFactory factory;

@PostConstruct
public void construtor() {
	Configuration configuration = new Configuration();
	configuration.configure();
	this.factory = configuration.buildSessionFactory();
}

public SessionFactory getInstance() {
	return this.factory;
}

@PreDestroy
public void destrutor() {
	this.factory.close();
}

}[/code]

Session:

[code]@Component
public class HibernateSession implements ComponentFactory {

private SessionFactory factory;
private Session session;

public HibernateSession(SessionFactory factory) {
	this.factory = factory;
}

@PostConstruct
public void construtor() {
	this.session = factory.openSession();
}

public Session getInstance() {
	return this.session;
}

@PreDestroy
public void destrutor() {
	this.session.close();
}

}[/code]

E nos lugares que eu preciso, recebo uma Session por injeção. Alguém tem alguma dica do que pode ser?

Rafael_Guerreiro · Março 1, 2014, 5:24pm

A culpa ai é do MySql na verdade… Ele mata as conexões por inatividade de 8 horas (default)…

Poste a configuração do seu Hibernate, pois basta você incluir as configurações do C3P0 que ele vai criar conexões novas para você…

Você define o timeout, ou seja, se colocar um timeout menor que 8 horas, nunca vai dar tempo do MySql matar essa conexão…

gutomarzagao · Março 1, 2014, 5:55pm

As configurações que estou usando são essas:

[code]

root jdbc:mysql://localhost/rateioamigo com.mysql.jdbc.Driver org.hibernate.dialect.MySQL5InnoDBDialect

	<property name="hibernate.hbm2ddl.auto">update</property>

	<!-- <property name="show_sql">true</property> -->
	<!-- <property name="format_sql">true</property> -->
	<!-- <property name="use_sql_comments">true</property> -->

	<mapping class="br.com.metamorfosevirtual.models.Broadcast" />
	<mapping class="br.com.metamorfosevirtual.models.Cliente" />
	<mapping class="br.com.metamorfosevirtual.models.Convite" />
	<mapping class="br.com.metamorfosevirtual.models.Evento" />
	<mapping class="br.com.metamorfosevirtual.models.Item" />
	<mapping class="br.com.metamorfosevirtual.models.Mesa" />
	<mapping class="br.com.metamorfosevirtual.models.Newsletter" />
	<mapping class="br.com.metamorfosevirtual.models.Restaurante" />
	<mapping class="br.com.metamorfosevirtual.models.Satisfacao" />
</session-factory>

[/code]

Quais configurações você recomenda que eu use?
Obrigado pela ajuda.

Rafael_Guerreiro · Março 2, 2014, 7:15pm

Faltaram algumas propriedades do c3p0 (precisa verificar antes se você tem o jar dele no seu projeto)

Você vai precisar entender o que cada uma dessas faz e qual o valor mais adequado para os seus projetos.

&lt;property name="hibernate.connection.provider_class"&gt;org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider&lt;/property&gt;
&lt;property name="hibernate.c3p0.acquire_increment"&gt;1&lt;/property&gt;
&lt;property name="hibernate.c3p0.timeout"&gt;180&lt;/property&gt; &lt;!-- segundos --&gt;
&lt;property name="hibernate.c3p0.min_size"&gt;2&lt;/property&gt;
&lt;property name="hibernate.c3p0.max_size"&gt;10&lt;/property&gt;
&lt;property name="hibernate.c3p0.max_statements"&gt;0&lt;/property&gt;

system · Janeiro 6, 2016, 4:18am

Problema com VRaptor / Hibernate

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