http://hibernate.org: The core O/RM functionality as provided by Hibernate (Hibernate.org) 
Package defining bytecode code enhancement (instrumentation) support. This package should mostly be considered deprecated in favor of enhance 
/**
 * Package defining bytecode code enhancement (instrumentation) support.
 *
 * This package should mostly be considered deprecated in favor of {@link org.hibernate.bytecode.enhance}
 */
package org.hibernate.bytecode.instrumentation.spi;