<hibernate-configuration>
   <session-factory>
      <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
      <property name="hibernate.connection.username">NSE</property>
      <property name="hibernate.connection.password">nse</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="hibernate.connection.release_mode">auto</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      <property name="hibernate.hbm2ddl.auto">update</property>
      <property name="current_session_context_class">thread</property>
      <property name="show_sql">false</property>
      <property name="format_sql">true</property>
      <property name="current_session_context_class">thread</property>

      <mapping resource="NSE.hbm.xml" />
   </session-factory>
</hibernate-configuration> 

conString=jdbc:oracle:thin:@localhost:1521:XE
driver=oracle.jdbc.driver.OracleDriver
Dialect=org.hibernate.dialect.OracleDialect
username=usrName
password=passWd

public class HibernateUtil {

   private static final SessionFactory sessionFactory = buildSessionFactory();
   static final Logger logger = Logger.getLogger(HibernateUtil.class);

   private static SessionFactory buildSessionFactory() {
      try {
         // Create the SessionFactory from hibernate.cfg.xml
         Properties properties = new Properties();
         properties.load(Thread.currentThread().getContextClassLoader()
               .getResourceAsStream("connection.properties"));

         Configuration cfg = new Configuration();
         cfg = cfg.configure();
         cfg.setProperty("hibernate.connection.driver_class", properties
               .getProperty("driver"));
         cfg.setProperty("hibernate.connection.url", properties
               .getProperty("conString"));
         cfg.setProperty("hibernate.connection.username", properties
               .getProperty("username"));
         cfg.setProperty("hibernate.connection.password", properties
               .getProperty("password"));
         cfg.setProperty("hibernate.dialect", properties
               .getProperty("Dialect"));
         return cfg.buildSessionFactory();
      } catch (Throwable ex) {
      
         logger.error(ex.toString());
         throw new ExceptionInInitializerError(ex);
      }
   }

   public static SessionFactory getSessionFactory() {
      return sessionFactory;
   }

java.lang.ExceptionInInitializerError
   at login.LoginVerify.doPost(LoginVerify.java:66)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
   at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
   at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
   at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
   at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:183)
   at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3717)
   at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
   at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
   at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
   at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
   at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
   at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
   at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
   at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.NullPointerException
   at helper.HibernateUtil.buildSessionFactory(HibernateUtil.java:43)
   at helper.HibernateUtil.(HibernateUtil.java:18)