Caused by: java.lang.NullPointerException
   at org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:75)
   at org.hibernate.engine.jdbc.internal.JdbcServicesImpl$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcServicesImpl.java:227)
   at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:113)
   at org.hibernate.service.internal.BasicServiceRegistryImpl.configureService(BasicServiceRegistryImpl.java:80)
   at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:143)
   at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:118)
   at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:68)
   at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2251)
   at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2247)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1718)
   at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:77)
   at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:894)
   at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:879)
   at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
   at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
   at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)

/**
    * {@inheritDoc}
    */
   public Connection getConnection() throws SQLException {
      final Connection c = ds.getConnection(); // C3P0ConnectionProvider.java:75   Datasource ds is not initalized
      if ( isolation != null ) {
         c.setTransactionIsolation( isolation.intValue() );
      }
      if ( c.getAutoCommit() != autocommit ) {
         c.setAutoCommit( autocommit );
      }
      return c;
   }

<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"  version="2.0">
<persistence-unit name="bclayer">
   <properties>

    <property name="hibernate.connection.provider_class" value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider"/>
    <property name="hibernate.c3p0.min_size"         value="5"/>   
    <property name="hibernate.c3p0.max_size"         value="800"/>   
    <property name="hibernate.c3p0.max_statements"   value="10000"/>   
    <property name="hibernate.c3p0.timeout"          value="3600"/>   
    <property name="hibernate.c3p0.idle_test_period" value="3000"/> 
     
<!-- JDBC-driver -->
    <property name="hibernate.connection.driver_class" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
    <property name="hibernate.connection.url" value="jdbc:sqlserver://pbz:1433;databasename=TestServer3"/>
    <property name="hibernate.connection.username" value="sa"/>
    <property name="hibernate.connection.password" value="123"/>
    <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
   
    ...
   
   </properties>
</persistence-unit>
</persistence>

@Override
   protected <T extends Service> void configureService(T service) {
      applyInjections( service );

      if ( ServiceRegistryAwareService.class.isInstance( service ) ) {
         ( (ServiceRegistryAwareService) service ).injectServices( this );
      }

      if ( Configurable.class.isInstance( service ) ) {
         ( (Configurable) service ).configure( configurationValues );
      }
   }

public class C3P0ConnectionProvider implements ConnectionProvider {