Hello good fellas! in my journey of learning hibernate i came across an article on hibernate site. i' learning spring too and wanted to do certain things to discover
the flexibility of spring by letting you implement you own session.yes i don't want to use
the hibernateTemplate(for experiment). and i'm now having a problem and even
the test class.I followed
the article on
the hibernate site especially
the section an "implementation with hibernate"
so we have
the generic dao interface :
public interface GenericDAO<T, ID extends Serializable> {
T findById(ID id, boolean lock);
List<T> findAll();
List<T> findByExample(T exampleInstance);
T makePersistent(T entity);
void makeTransient(T entity);
}
it's implementation in an abstract class that is
the same as
the one on
the web site.Please refer to it from
the link i provide.i'll like to save this post to be too long
now come my dao's messagedao interface
package com.project.core.dao;
import com.project.core.model.MessageDetails;
import java.util.List;
public interface MessageDAO extends GenericDAO<MessageDetails, Long>{
//Message class is on of my pojo
public List<Message> GetAllByStatus(String status);
}
its implementation is messagedaoimpl:
public class MessageDAOImpl extends GenericDAOImpl <Message, Long> implements MessageDAO {
// mySContainer is an interface which my HibernateUtils implement
mySContainer sessionManager;
/**
*
*/
public MessageDAOImpl(){}
/**
*
* @param sessionManager
*/
public MessageDAOImpl(HibernateUtils sessionManager){
this.sessionManager = sessionManager;
}
//........ plus other methods
}
here is my HibernatUtils
public class HibernateUtils implements SessionContainer {
private final SessionFactory sessionFactory;
private Session session;
public HibernateUtils() {
this.sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
}
public HibernateUtils(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
/**
*
* this is
the function that return a session.So i'm free to implements any type of session in here.
*/
public Session requestSession() {
// if (session != null || session.isOpen()) {
// return session;
// } else {
session = sessionFactory.openSession();
// }
return session;
}
}
So in my understanding while using spring(will provide
the conf), i'ld wire sessionFactory to my HiberbernateUtils and then wire its method RequestSession to
the Session Property of
the GenericDAOImpl (the one from
the link provided).
here is my spring config core.xml
<bean id="sessionManager" class="com.project.core.dao.hibernate.HibernateUtils">
<constructor-arg ref="sessionFactory" />
</bean>
<bean id="messageDao" class="com.project.core.dao.hibernate.MessageDAOImpl">
<constructor-arg ref="sessionManager"/>
</bean>
<bean id="genericDAOimpl" class="com.project.core.dao.GenericDAO">
<property name="session" ref="mySession"/>
</bean>
<bean id="mySession" factory-bean="com.project.core.dao.SessionContainer" factory-method="requestSession"/>
now my test is this
public class MessageDetailsDAOImplTest extends AbstractDependencyInjectionSpringContextTests{
HibernateUtils sessionManager = (HibernateUtils) applicationContext.getBean("sessionManager");
MessageDAO messagedao =(MessageDAO) applicationContext.getBean("messageDao");
static Message[] message = new Message[]
{
new Message("text",1,"test for dummies 1","1234567890","Pending",new Date()),
new Message("text",2,"test for dummies 2","334455669990","Delivered",new Date())
};
public MessageDAOImplTest() {
}
@Override
protected String[] getConfigLocations(){
return new String[]{"file:src/main/resources/core.xml"};
}
@Test
public void testMakePersistent() {
System.out.println("MakePersistent");
messagedao.makePersistent(message[0]);
Session session = sessionManager.RequestSession();
session.beginTransaction();
MessageDetails fromdb = ( Message) session.load(Message.class, message[0].getMessageId());
assertEquals(fromdb.getMessageId(), message[0].getMessageId());
assertEquals(fromdb.getDateSent(),message.getDateSent());
assertEquals(fromdb.getGlobalStatus(),message.getGlobalStatus());
assertEquals(fromdb.getNumberOfPages(),message.getNumberOfPages());
}
i'm having this error
exception in constructor testMakePersistent(java.lang.NullPointerException at com.project.core.dao.hibernate.MessageDAOImplTest)
with this stack : at com.project.core.dao.hibernate.MessageDAOImplTest.(MessageDAOImplTest.java:28)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at junit.framework.TestSuite.createTest(TestSuite.java:61)
at junit.framework.TestSuite.addTestMethod(TestSuite.java:283)
at junit.framework.TestSuite.(TestSuite.java:146)
at org.apache.tools.
ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:481)
at org.apache.tools.
ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1031)
at org.apache.tools.
ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:888)
))
How to actually make this one work.I know this is a lot to stuffs and i'm thanking you for reading it.Please give me a solution.How would you do this? thanks
