NullPointer Exception on Hibernate Inicialization

henriques · **Joined:** Wed May 05, 2010 1:21 pm **Posts:** 1

Hello, i am fairly new to hibernate and have been having some problems to inicialize hibernate. I tried using spring but had some problems to integrate with hibernate search so i decided to fall back to pure hibernate. I got this HibernateUtil class which inicializes the following way:

Code:

public static void initialize()
    {
        try
        {
            sessionFactory = configuration.configure().buildSessionFactory();
            System.out.println( ">>Sucess MSG" );
        }
        catch ( Throwable e )
        {
           System.out.println( ">> Fail MSG" );
           e.printStackTrace();
        }
    }

my hibernate.cfg.xml is in the root directory (i dont know how to add it to classpath on netbeans [it was self generated])

Code:

<hibernate-configuration>
  <session-factory name="session">
    <!-- Username utilizado no BD -->
    <property name="hibernate.connection.username">root</property>
    <!-- Senha utilizado no BD -->
    <property name="hibernate.connection.password">root</property>
    <!-- Chamada de URL ou string de conexao, deve ser configurado de acordo com documentacao do banco de dados -->
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/clio-j</property>
    <!-- Driver que deve ser utilizado -->
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <!-- Dialeto a ser utilizado para a comunicacao com o banco de dados -->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <!-- Como o hibernate vai se comportar em relacao as tabelas do banco. Com o update ele vai criar ou modificar tabelas sempre que necessario. -->
    <property name="hibernate.hbm2ddl.auto">update</property>
    <!-- Flag que indica se os SQLs gerados devem ser impressos -->
    <property name="show_sql">true</property>
    <!-- Flag que indica se os SQLs devem ser formatados-->
    <property name="format_sql">true</property>
    <!-- Flag que indica que a configuracao do hibernate deve ser gerenciada automaticamente -->
    <property name="hibernate.current_session_context_class">thread</property>
    <!-- Informando ao Hibernate sobre a classe existente -->
    <mapping class="br.ufpe.liber.clioj.dominio.Administrador"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Audio"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Colecao"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Documento"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Grupo"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Historico"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Imagem"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Local"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Notas"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Permissao"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Refinemento"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Texto"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Usuario"/>
    <mapping class="br.ufpe.liber.clioj.dominio.Video"/>
    
  </session-factory>
</hibernate-configuration>

and here is the stacktrace for the error

Code:

INFO: >> Fail MSG
SEVERE: java.lang.NullPointerException
        at br.ufpe.liber.clioj.util.hibernate.HibernateUtil.initialize(HibernateUtil.java:42)
        at br.ufpe.liber.clioj.util.hibernate.HibernateUtil.getSession(HibernateUtil.java:116)
        at br.ufpe.liber.clioj.dao.hibernate.DocumentoDaoImpl.<init>(DocumentoDaoImpl.java:21)
        at org.apache.jsp.admin.cadastroHandler_jsp._jspService(cadastroHandler_jsp.java from :69)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:406)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:483)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:373)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
        at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)

thanks in advance!

pst im completly new to this so try to be as explanatory as possible thanks =D.

oooo almost forgot, here's getSession()

Code:

public static Session getSession()
    {
       if( sessionFactory == null ){
          initialize();
          closeSession();
       }

        Session s = (Session) threadSession.get();
        if ( s == null )
        {
            s = sessionFactory.openSession();
            threadSession.set( s );
        }
        return s;
    }

sanne.grinovero · **Posted:** Thu May 06, 2010 2:32 pm

well there's a NullPointerException happening in your own code, it says on line 42, but you're the only one able to tell what that line is.