Como verifico se a conexão do banco estáo ok via JNI...java.lang.NullPointerException

package util;

import org.hibernate.Session;

public class ConectaHibernateMysql {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Session sessao=null;
		try {
			 sessao=HibernateUtil.getSessionfactory().openSession();
			 System.out.println("Conectou....ok");
		} catch (Throwable e) {
			 System.out.println("Erro ao conectar ao banco de dados..."+e.getMessage());
			 System.out.println("Erro ao conectar ao banco de dados..."+e);
		}finally{
			sessao.close();
		}

	}

}
---------------------
package util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

	private static final SessionFactory sessionFactory = buildSessionFactory();
	private static SessionFactory buildSessionFactory(){
		try {
			
			Configuration cfg = new Configuration();
			//AnnotationConfiguration cfg = new AnnotationConfiguration();
			
			cfg.configure("hibernate.cfg.xml");
			return cfg.buildSessionFactory();
		} catch (Exception e) {
			System.out.println("Criação Inicial do objeto SessionFactory falhou .Erro :"+e);
		}
		return getSessionfactory();
	}
	
	public static SessionFactory getSessionfactory(){
		return sessionFactory;
	}
}
------------
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/workspace/SecurityJdbc/WebContent/WEB-INF/lib/slf4j-log4j12-1.6.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/workspace/SecurityJdbc/WebContent/WEB-INF/lib/slf4j-simple-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.NullPointerException
	at util.ConectaHibernateMysql.main(ConectaHibernateMysql.java:20)
Criação Inicial do objeto SessionFactory falhou .Erro :org.hibernate.HibernateException: Could not find datasource
Erro ao conectar ao banco de dados...null
Erro ao conectar ao banco de dados...java.lang.NullPointerException

<?xml version="1.0" encoding="UTF-8"?>

<Context reloadable="true">
	<Resource	name="jdbc/stripessec" 
				auth="Container" 
				type="javax.sql.DataSource"
				maxActive="100" 
				maxIdle="30" 
				maxWait="10000"
				username="root" 
				password="paulo" 
				driverClassName="com.mysql.jdbc.Driver"
				url="jdbc:mysql://localhost:3306/seguranca"/>

	<Realm className="org.apache.catalina.realm.DataSourceRealm"
		debug="99" dataSourceName="jdbc/stripessec" localDataSource="true"
		userTable="usuario" userNameCol="login" userCredCol="password"
		userRoleTable="regra" roleNameCol="regra" />


</Context>

<!-- Configuração do DataSource. -->
	<!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
	<resource-ref>
		<description>Web Database</description>
		<res-ref-name>jdbc/stripessec</res-ref-name>
		<res-type>javax.sql.DataSource</res-type>
		<res-auth>Container</res-auth>
	</resource-ref>

<property name="connection.datasource">java:/comp/env/jdbc/stripessec</property>
		<!--JDBC connection pool(use built-in)-->
		<property name="connection.pool_size">1</property>
		<!--SQL dialect -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- Enable Hibernate's automatic session context management -->
		<property name="current_session_context_class">thread</property>
		<!-- Disable the second-level cache -->
		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
		<!-- Echo all execute SQL to stdout-->
		<property name="show_sql">false</property>
		<property name="current_session_context_class">thread</property>