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  • dpHibernate problem

    I'm hoping someone can point out what I'm doing wrong. I'm exposing a service via BlazeDS and am trying to get dpHibernate to lazy load the entities for me but can't figure out why dpHibernate is unable to access the hibernate session - I get a 'No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here' error every time I invoke the method to retreive the list of parents.

    My web.xml is :
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
    <web-app>

    <display-name>dptest</display-name>

    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/config/applicationConfig.xml</param-value>
    </context-param>

    <listener>
    <listener-class>org.springframework.web.context.ContextLoade rListener</listener-class>
    </listener>

    <!-- The front controller of this Spring Web application, responsible for handling all application requests -->
    <servlet>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherSe rvlet</servlet-class>
    <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/config/web-application-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Mapp all /messagebroker reequests to the DispatcherServlet for handling -->
    <servlet-mapping>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <url-pattern>/messagebroker/*</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    </welcome-file-list>


    </web-app>


    my applicationContext.xml is:
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans http://www.springframework.org/schem...ring-beans.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <!-- Database related stuff here -->
    <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="org.gjt.mm.mysql.Driver"/>
    <property name="url" value="jdbc:mysql://localhost/dp"/>
    <property name="username" value="root"/>
    <property name="password" value=""/>
    </bean>
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotati on.AnnotationSessionFactoryBean">
    <property name="dataSource">
    <ref bean="dataSource"/>
    </property>
    <property name="hibernateProperties">
    <props>
    <prop key="hibernate.dialect">org.hibernate.dialect.MySQ LInnoDBDialect</prop>
    <!-- <prop key="hibernate.hbm2ddl.auto">create</prop> -->
    <prop key="hibernate.cache.use_query_cache">false</prop>
    <prop key="hibernate.cache.use_second_level_cache">false </prop>
    </props>
    </property>
    <property name="annotatedClasses">
    <list>
    <value>test.entity.Parent</value>
    <value>test.entity.Child</value>
    </list>
    </property>
    </bean>

    <tx:annotation-driven transaction-manager="txManager"/>

    <bean id="txManager" class="org.springframework.orm.hibernate3.Hibernat eTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    </beans>


    my web-application-context.xml is:
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:flex="http://www.springframework.org/schema/flex"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans http://www.springframework.org/schem...-beans-2.5.xsd
    http://www.springframework.org/schema/flex http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">

    <bean id="hibernate-lazy-adapter" class="org.springframework.flex.core.ManageableCom ponentFactoryBean">
    <constructor-arg value="net.digitalprimates.persistence.hibernate.H ibernateAdapter"/>
    <property name="properties">
    <value>
    {"hibernate" :
    {"sessionFactory" :
    { "class" : "net.digitalprimates.persistence.hibernate.utils.S pringSessionUtil",
    "getCurrentSessionMethod" : "getCurrentSession"
    }
    }
    }
    </value>
    </property>
    </bean>

    <!-- Flex stuff -->
    <flex:message-broker>
    </flex:message-broker>

    <!-- Beans -->
    <bean id="testService" class="test.service.TestServiceImpl">
    <property name="sessionFactory" ref="sessionFactory" />
    <flex:remoting-destination service-adapter="hibernate-lazy-adapter"/>
    </bean>
    </beans>


    My parent class:
    package test.entity;

    import java.util.HashSet;
    import java.util.Set;

    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.OneToMany;

    @Entity
    public class Parent {

    @Id @GeneratedValue
    private int id;

    private String name;

    @OneToMany(mappedBy="parent")
    private Set<Child> kids = new HashSet<Child>();

    public int getId() {
    return id;
    }

    public void setId(int id) {
    this.id = id;
    }

    public String getName() {
    return name;
    }

    public void setName(String name) {
    this.name = name;
    }

    public Set<Child> getKids() {
    return kids;
    }

    public void setKids(Set<Child> kids) {
    this.kids = kids;
    }
    }


    My child class:
    package test.entity;

    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.JoinColumn;
    import javax.persistence.ManyToOne;

    @Entity
    public class Child {

    @Id @GeneratedValue
    private int id;

    private String name;

    @ManyToOne
    @JoinColumn(name="parent_id")
    private Parent parent;

    public Parent getParent() {
    return parent;
    }

    public void setParent(Parent parent) {
    this.parent = parent;
    }

    public int getId() {
    return id;
    }

    public void setId(int id) {
    this.id = id;
    }

    public String getName() {
    return name;
    }

    public void setName(String name) {
    this.name = name;
    }
    }


    TestService interface:
    package test.service;

    import java.util.List;

    import test.entity.Parent;

    public interface TestService {

    List<Parent> getParents();

    }


    and finally the implementation:
    package test.service;

    import java.util.List;

    import org.hibernate.SessionFactory;
    import org.springframework.transaction.annotation.Transac tional;

    import test.entity.Parent;

    @Transactional
    public class TestServiceImpl implements TestService {
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<Parent> getParents() {
    List l = sessionFactory.getCurrentSession().createQuery("fr om Parent p").list();
    return l;
    }

    }


    I expect it'll be something obvious but I just can't see the mistake!

  • #2
    Mattman -

    You need to create an openSessionInViewFilter in your web.xml. I was unsuccessful getting dpHibernate to work any other way


    <filter>
    <filter-name>openSessionInViewFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.O penSessionInViewFilter</filter-class>
    <init-param>
    <param-name>flushMode</param-name>
    <param-value>ALWAYS</param-value>
    </init-param>
    </filter>

    <filter-mapping>
    <filter-name>openSessionInViewFilter</filter-name>
    <url-pattern>/messagebroker/*</url-pattern>
    </filter-mapping>


    Also, in your app-context.xml, make sure you define a "load" method in the HibernateAdapter:

    <bean id="hibernate-lazy-adapter" class="org.springframework.flex.core.ManageableCom ponentFactoryBean">
    <constructor-arg value="net.digitalprimates.persistence.hibernate.H ibernateAdapter"/>
    <property name="properties">
    <value>
    {
    "hibernate":
    {
    "sessionFactory":
    {
    "class":"net.digitalprimates.persistence.hibernate .utils.SpringSessionUtil",
    "getCurrentSessionMethod":"getCurrentSession"
    },
    "loadMethod":"load"
    }
    }
    </value>
    </property>
    </bean>

    In this case, "load" will be called on your DAOs -- this method is used just for the purpose of loading lazy objects when they are accessed -- not other service calls.

    Hope this helps.
    -Ryan

    Comment


    • #3
      Ryan - great advice. That works just fine.

      Many thanks,
      Matt

      Comment

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