Hibernate LazyInitializationException in web application Struts as MVC, Spring as IOC and Hibernate as ORM layer

From:
Amit Jain <amitatgroups@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 23 Apr 2009 22:33:26 -0700 (PDT)
Message-ID:
<879c5af0-20c4-4ab9-963f-0a38553d49c7@x31g2000prc.googlegroups.com>
I am attempting to create a web application using Struts MVC, Spring
IOC and with Hibernate as its ORM layer.

Exception raised when I try to get memberVO object. Problem with
Hibernate Lazy initialization.

stack trace:
-------------------------------------------------------------
javax.servlet.ServletException:
org.hibernate.LazyInitializationException: failed to lazily initialize
a collection of role: com.yashbinary.crtracker.vo.MemberVO.apsses, no
session or session was closed
    org.apache.struts.action.RequestProcessor.processException
(RequestProcessor.java:535)
    org.apache.struts.action.RequestProcessor.processActionPerform
(RequestProcessor.java:433)

com.yashbinary.crtracker.struts.controller.XRequestProcessor.processActionPerform
(XRequestProcessor.java:45)
    org.apache.struts.action.RequestProcessor.process
(RequestProcessor.java:236)
    com.yashbinary.crtracker.struts.controller.XRequestProcessor.process
(XRequestProcessor.java:32)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1196)
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter
(MonitorFilter.java:390)

org.hibernate.LazyInitializationException: failed to lazily initialize
a collection of role: com.yashbinary.crtracker.vo.MemberVO.apsses, no
session or session was closed
        at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException
(AbstractPersistentCollection.java:358)
        at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected
(AbstractPersistentCollection.java:350)
        at
org.hibernate.collection.AbstractPersistentCollection.initialize
(AbstractPersistentCollection.java:343)
        at org.hibernate.collection.AbstractPersistentCollection.read
(AbstractPersistentCollection.java:86)
        at org.hibernate.collection.PersistentSet.hashCode
(PersistentSet.java:411)
        at java.util.HashMap.containsKey(HashMap.java:377)
        at java.util.HashSet.contains(HashSet.java:182)
        at
org.apache.commons.lang.builder.ReflectionToStringBuilder.isRegistered
(ReflectionToStringBuilder.java:133)
        at
org.apache.commons.lang.builder.ReflectionToStringBuilder.appendFieldsIn
(ReflectionToStringBuilder.java:629)
        at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString
(ReflectionToStringBuilder.java:789)
        at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString
(ReflectionToStringBuilder.java:355)
        at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString
(ReflectionToStringBuilder.java:173)
        at com.yashbinary.crtracker.common.ValueObject.toString
(ValueObject.java:23)
        at java.lang.String.valueOf(String.java:2615)
        at java.lang.StringBuilder.append(StringBuilder.java:116)
        at com.yashbinary.crtracker.struts.login.LoginAction.execute
(LoginAction.java:52)
        at org.springframework.web.struts.DelegatingActionProxy.execute
(DelegatingActionProxy.java:106)
        at
org.apache.struts.action.RequestProcessor.processActionPerform
(RequestProcessor.java:431)
        at
com.yashbinary.crtracker.struts.controller.XRequestProcessor.processActionPerform
(XRequestProcessor.java:45)
        at org.apache.struts.action.RequestProcessor.process
(RequestProcessor.java:236)
        at
com.yashbinary.crtracker.struts.controller.XRequestProcessor.process
(XRequestProcessor.java:32)
        at org.apache.struts.action.ActionServlet.process
(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doPost
(ActionServlet.java:432)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:
637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:
717)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
        at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter
(MonitorFilter.java:390)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol
$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run
(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:595)
-----------------------------------------------------------------------------------

Here is a code:
---------------------------------------

hibernate.cfg.xml
---------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate
Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-
configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property
name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property
name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</
property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:
3306/crtracker</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">root</property>
    <mapping resource="com/yashbinary/crtracker/vo/h_mapping/
Apss.hbm.xml"/>
    <mapping resource="com/yashbinary/crtracker/vo/h_mapping/
Member.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

Member.hbm.xml
--------------------------------
<hibernate-mapping>
    <class name="com.yashbinary.crtracker.vo.MemberVO" table="member"
catalog="crtracker">
        <id name="empId" type="int">
            <column name="emp_id" />
            <generator class="assigned" />
        </id>
        <property name="firstName" type="string">
            <column name="first_name" length="50" />
        </property>
        <property name="lastName" type="string">
            <column name="last_name" length="50" />
        </property>
        <property name="emailId" type="string">
            <column name="email_id" length="20" />
        </property>
        <property name="password" type="string">
            <column name="password" length="10" />
        </property>
        <set name="apsses" inverse="true">
            <key>
                <column name="owner" not-null="true" unique="true" />
            </key>
            <one-to-many class="com.yashbinary.crtracker.vo.ApssVO" />
        </set>
    </class>
</hibernate-mapping>

applicationContext.xml
-------------------------------------------------
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource"><ref local="dataSource"/></property>
        <property name="mappingResources">
              <list> <value>com/yashbinary/crtracker/vo/h_mapping/
Member.hbm.xml</value>
                <value>com/yashbinary/crtracker/vo/h_mapping/
Apss.hbm.xml</value>
             </list>
        </property>
        <property name="hibernateProperties">
    <props>
         <prop key="hibernate.dialect">${hibernate.dialect}</prop>
         <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">create</prop>
    </props>
         </property>
</bean>

MemberVO.java
-----------------------------------------
package com.yashbinary.crtracker.vo;
import com.yashbinary.crtracker.common.ValueObject;
import java.util.HashSet;
import java.util.Set;
public class MemberVO extends ValueObject implements
java.io.Serializable {
     private int empId;
     private String firstName;
     private String lastName;
     private String emailId;
     private String password;
     private Set<ApssVO> apsses = new HashSet<ApssVO>(0);
    public MemberVO() {
    }
 public MemberVO(int empId) {
        this.empId = empId;
    }
 public MemberVO(int empId, String firstName, String lastName, String
emailId, String password, Set<ApssVO> apsses) {
       this.empId = empId;
       this.firstName = firstName;
       this.lastName = lastName;
       this.emailId = emailId;
       this.password = password;
       this.apsses = apsses;
    }

// setter n getter for empId, firstName, lastName, emailId,
password

    public Set<ApssVO> getApsses() {
        return this.apsses;
    }
    public void setApsses(Set<ApssVO> apsses) {
        this.apsses = apsses;
    }
}

MemberDAO.java
----------------------------------
package com.yashbinary.crtracker.member.dao;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
public class MemberDAO extends HibernateDaoSupport implements
DataAccessObject {

  public ValueObject findByCriteria(MemberVO memberVO) throws
DataAccessException{
        log.debug("findByCriteria() start");
        Session session = null;
        Criteria criteria = null;
        MemberVO returnVO = null;
        try{
            session = getHibernateTemplate().getSessionFactory
().openSession();
            criteria = session.createCriteria(MemberVO.class);

            criteria.add(Restrictions.eq("empId", memberVO.getEmpId
() ) );
            criteria.add(Restrictions.eq("password",
memberVO.getPassword() ) );

            //returnVO = (MemberVO) criteria.uniqueResult();
            List returnVOList = criteria.list();
            if(returnVOList!=null){
                returnVO = (MemberVO)returnVOList.get(0);
            }
        }catch(HibernateException e){
            log.error("HibernateException thrown in
MemberDAO.findByCriteria()", e);
        }catch(ServiceLocatorException e){
            log.error("ServiceLocatorException thrown in
MemberDAO.findByCriteria()", e);
        }finally{
            if(session!=null)
                session.close();
        }
        log.debug("findByCriteria() end");
        return returnVO;
    }
}

MemberManagerBD.java
-----------------------------------------------
public class MemberManagerBD {
   public MemberVO authenticate(String empId, String password) throws
ApplicationException{
       MemberDAO memberDAO = getMemberDAO();
       MemberVO memberVO = (MemberVO) memberDAO.findByCriteria
(memberVO);
       return memberVO;
  }

LoginAction.java
---------------------------------------
public class LoginAction extends org.apache.struts.action.Action {
   public ActionForward execute(){
       MemberManagerBD memManagerBD = getMemberMangerBD();
memberVO = memManagerBD.authenticate(((LoginForm)form).getEmpId(),
                             ((LoginForm)form).getPassword()
                      );
   }
}

Thanks in advance for your help

Amit Jain

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