Spring, Hibernate and Lazy initialize - spring

Question

I read many post about this problem on SO and didn't find any solution for me.
So what I have
Error
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: ua.home.bla.entity.Question.answers, no session or session was closed
Entity
#Entity
#Table(name = "Question")
public class Question implements Serializable{
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String question;
#OneToMany(mappedBy="question")
private List<Answer> answers;
.....
DAO
#Repository
#Transactional
public class QuestionDAOImpl implements QuestionDAO {
#Autowired
private SessionFactory sessionFactory;
#SuppressWarnings("unchecked")
// #Transactional
public List<Question> getQuestion() {
// TODO Auto-generated method stub
return sessionFactory.getCurrentSession().createQuery("from Question").list();
}
}
Service
#Service
public class QuestionServiceImpl implements QuestionService {
#Autowired
private QuestionDAO questionDAO;
#Transactional
public List<Question> getQuestion() {
return questionDAO.getQuestion();
}
}
Controller
#Controller
public class QuestionController {
#Autowired
private QuestionService questionService;
#RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Model model){
List<Question> qu =questionService.getQuestion();
System.out.println(qu);
return "home";
}
}
I try use OpenSessionInViewFilter, with and without url-pattern
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
I try use annotation EAGER, other error
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.StackOverflowError
I don't know how use this solution in my code Hibernate.initialize
in data.xml add SessionFactoryUtils, from some answer in SO
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8" />
</bean>
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
p:location="/WEB-INF/jdbc.properties" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.databaseurl}"
p:username="${jdbc.username}"
p:password="${jdbc.password}" />
<bean name="hibernateSession" class="org.springframework.orm.hibernate3.SessionFactoryUtils" factory-method="getSession"
scope="prototype">
<constructor-arg index="0" ref="hibernateSessionFactory"/>
<constructor-arg index="1" value="false"/>
<aop:scoped-proxy/>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
<!-- <value>classpath*:**/hibernate.cfg.xml</value> -->
</property>
<property name="configurationClass">
<value>org.hibernate.cfg.AnnotationConfiguration</value>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.dialect">${jdbc.dialect}</prop>
<prop key="hibernate.connection.charSet">UTF-8</prop>
</props>
</property>
</bean>
</beans>
Any idea for solution of my problem? Maybe somewhere I something missed?
hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<mapping class="ua.home.bla.entity.Answer" />
<mapping class="ua.home.bla.entity.Question" />
<mapping class="ua.home.bla.entity.Contact" />
</session-factory>
</hibernate-configuration>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring/root-context.xml
</param-value>
</context-param>
<!-- Container Spring -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter> -->
<!-- Base Servlet -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>charsetFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>charsetFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> -->
</web-app>
root-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<!-- (#Annotation-based configuration)-->
<context:annotation-config />
<!-- (#Component, #Service) -->
<context:component-scan base-package="ua.home.bla.dao" />
<context:component-scan base-package="ua.home.bla.service" />
<!-- (Data Access Resources) -->
<import resource="data.xml" />
</beans>
controllers.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- Dir with conrollers-->
<context:component-scan base-package="ua.home.bla.web" />
</beans>
servlet-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
xsi:schemaLocation="
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<!-- #Controller etc. -->
<annotation-driven />
<!-- css, javascript in dir webapp/resources -->
<resources mapping="/resources/**" location="/resources/" />
<!-- jsp /WEB-INF/views -->
<beans:bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<!-- controllers settings -->
<beans:import resource="controllers.xml" />
</beans:beans>
Thx!
----UPDATE-----
Question entity method toString
#Override
public String toString() {
return "Question [id=" + id + ", question=" + question + ", answers="
+ answers + "]";
}
Answer entity method toString
#Override
public String toString() {
return "Answer [id=" + id + ", answer=" + answer + ", isCorrect="
+ isCorrect + ", questions=" + question + "]";
}
if I delete
", questions=" + question
no error, but don't have information about question entity. Not full result.
Answer entity
#Entity
public class Answer implements Serializable {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String answer;
private byte isCorrect;
#ManyToOne
#JoinColumn(name="QuestionID")
private Question question;

Answer 1

Your configuration lacks a filter-mapping for the OpenSessionInViewFilter, without that it is going to do exactly nothing. Next to that your filter is commented out.
add
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<servlet-name>appServlet</servlet-name>
</filter-mapping>
and activate your filter.