ConfigurationHelper leaks SessionFactories about jadira HOT 3 CLOSED

import java.lang.reflect.Field;
import java.util.HashMap;

import javax.annotation.PreDestroy;

import org.jadira.usertype.spi.shared.ConfigurationHelper;
import org.springframework.context.annotation.Configuration;

@Configuration
public class HibernateConfiguration {

   /**
    * Jadira's shared configuration helper records the "JDBC 4.2" compatibility for each
    * session manager that it's registered with.
    * <p>
    * Unfortunately, the configuration stores the SessionManager as the key in a static hash map,
    * which retains it indefinitely.
    * <p>
    * This is generally not a huge issue when running a web app, but during unit tests where context
    * are often created and destroyed, we leak a significant amount of memory (approx. 20mb/test execution),
    * resulting in the JVM running out of memory and slowly grinding to a hold
    */
   @PreDestroy
   public void clearOutJadiraConfigurationMap() {
      try {
         final Field map = ConfigurationHelper.class.getDeclaredField("DEFAULT_USEJDBC42");
         map.setAccessible(true);
         Object value = map.get(null);

         ((HashMap) value).clear();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}