Hi everyone!

Many people starts getting into my application, and they start getting the following error:

java.lang.NullPointerException
org.hibernate.jdbc.AbstractBatcher.closePreparedStatement(AbstractBatcher.java:526)
org.hibernate.jdbc.AbstractBatcher.closeStatement(AbstractBatcher.java:265)
org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:245)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
dao.DaoBCB.ModifierUtilisateur(DaoBCB.java:41)
business.BusinessBCB.modifierUtilisateur(BusinessBCB.java:30)
control.rapports.FermetureSessionVenteAction.execute(FermetureSessionVenteAction.java:84)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)


this is my hibernate config:

<?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">
<hibernate-configuration>
<session-factory name="RestoPlusSessionFactory">
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>


<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:BCB</property>
<property name="hibernate.connection.username">****</property>
<property name="hibernate.connection.password">***</property>

<!--
<property name="hibernate.connection.url">jdbc:oracle:thin*****</property>
<property name="hibernate.connection.username">****</property>
<property name="hibernate.connection.password">****</property>
-->
<property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.search.autoregister_listeners">false</property>
<property name="hibernate.connection.autocommit">true</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- <property name="hbm2ddl.auto">create-drop</property> -->
<property name="hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<property name="current_session_context_class">thread</property>
<property name="hiernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>


<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="hibernate.c3p0.idle_test_period">100</property>
<property name="hibernate.c3p0.timeout">100</property>
<property name="hibernate.c3p0.max_size">50</property>
<property name="hibernate.c3p0.min_size">5</property>

I have searched everywhere but nothing !

Any idea please ? Any help ?
Thanks in advance guys