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tcnguyen
 Post subject: ElementCollection: failed to lazily initialize a collection
PostPosted: Tue Jul 17, 2012 6:40 am 
Newbie

Joined: Tue Jul 17, 2012 5:41 am
Posts: 2
Hi,

I have a field with a set of String to save and edit the value of selectManyCheckbox. I use the annotation @ElementCollection as described in
http://docs.oracle.com/javaee/6/tutorial/doc/bnbqa.html
I can save at the first time but by editing I got the following exception:

Quote:
Caused by: javax.servlet.ServletException: failed to lazily initialize a collection, no session or session was closed
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:606) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.10.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.10.Final.jar:]
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79) [primefaces-3.3.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.10.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.10.Final.jar:]
at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.10.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.10.Final.jar:]
at org.jboss.solder.servlet.exception.CatchExceptionFilter.doFilter(CatchExceptionFilter.java:65) [solder-impl-3.1.0.Final.jar:3.1.0.Final]
... 29 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:385) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:378) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.collection.internal.PersistentSet.add(PersistentSet.java:206) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValuesForModel(MenuRenderer.java:382) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValue(MenuRenderer.java:129) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:315) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIInput.validate(UIInput.java:960) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIInput.processValidators(UIInput.java:698) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIForm.processValidators(UIForm.java:253) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
at org.apache.myfaces.extensions.cdi.jsf2.impl.listener.phase.CodiLifecycleWrapper.execute(CodiLifecycleWrapper.java:95) [myfaces-extcdi-jsf20-module-impl-1.0.5.jar:1.0.5]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
... 38 more


I use JBOSS 7.1.0-Final, Hibernate 4.0.1.Final and JSF 2.0

Following are my codes:

Test.java

Code:
@Entity
@Table(name = "TEST")
@NamedQueries({
   @NamedQuery(name = Test.FIND_BY_ID, query = "select test from Test test where test.id = :id")
})
public class Test implements Serializable {

   private static final long serialVersionUID = -7294677843656741933L;

   public static final String FIND_BY_ID = "test.by.id";
   
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private Long id;
   
   @ElementCollection(fetch=FetchType.EAGER)
   private Set<String> textes;
   
   public Test() {
   }

   public Long getId() {
      return id;
   }

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

   public Set<String> getTextes() {
      return textes;
   }

   public void setTextes(Set<String> textes) {
      this.textes = textes;
   }
}


test.xhtml

Code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core"
   xmlns:c="http://java.sun.com/jsp/jstl/core">

<body>
   <h:form id="form">
      <h:selectManyCheckbox value="#{formBean.test.textes}">
         <f:selectItem itemLabel="Option 1" itemValue="Option 1" /> 
            <f:selectItem itemLabel="Option 2" itemValue="Option 2" /> 
            <f:selectItem itemLabel="Option 3" itemValue="Option 3" /> 
      </h:selectManyCheckbox>

      <h:commandButton value="Save" action="#{formBean.saveTest}" />
   </h:form>
</body>
</html>

Following are the related sources:

FormBean.java

Code:
@Named
@SessionScoped
public class FormBean implements Serializable {

   private static final long serialVersionUID = 6484233109393875203L;
   
   @EJB
   private ServiceBean serviceBean;
   
   private Test test;

   public String saveTest() {
      serviceBean.save(test);
      return "test";
   }
   
   public String createTest() {
      test = new Test();
      return "test";
   }
   
   public Test getTest() {
      return test;
   }

   public void setTest(Test test) {
      this.test = test;
   }
   
}


ServiceBean.java

Code:
@Stateless
@LocalBean
public class ServiceBean {

   @PersistenceContext
   private EntityManager entityManager;

   public boolean save(Test test) {
      Test dbTest = findTestById(test.getId());
      if (dbTest == null) {
         entityManager.persist(test);
      }
      else {
         entityManager.merge(test);
      }
      
      return true;
   }
   
   public Test findTestById(Long id) {
      if (id == null)
         return null;

      TypedQuery<Test> query = entityManager.createNamedQuery(Test.FIND_BY_ID, Test.class);
      query.setParameter("id", id);
      List<Test> results = query.getResultList();

      if (results.isEmpty())
         return null;

      return results.get(0);
   }
}



test_index.xhtml

Code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core"
   xmlns:c="http://java.sun.com/jsp/jstl/core">

<body>
   <h:form>
      <h:commandLink value="Test" action="#{formBean.createTest()}" />
   </h:form>
</body>
</html>


Thanks for helps
Nguyen
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tcnguyen
 Post subject: Re: ElementCollection: failed to lazily initialize a collection
PostPosted: Thu Jul 19, 2012 6:07 am 
Newbie

Joined: Tue Jul 17, 2012 5:41 am
Posts: 2
I found the solution for this problem, which is already publiced in:
http://en.wikibooks.org/wiki/Java_Persistence/ElementCollection

Following is my solution:

Test.java

Code:
@Entity
@Table(name = "TEST")
@NamedQueries({
   @NamedQuery(name = Test.FIND_BY_ID, query = "select test from Test test where test.id = :id")
})
public class Test implements Serializable {

   private static final long serialVersionUID = -7294677843656741933L;

   public static final String FIND_BY_ID = "test.by.id";
   
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private Long id;
   
   @ElementCollection
   private Set<String> textes;
   
   public Test() {
   }

   public Long getId() {
      return id;
   }

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

   public Set<String> getTextes() {
      return textes;
   }

   public void setTextes(Set<String> textes) {
      this.textes = textes;
   }
}


test.xhtml

Code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core"
   xmlns:c="http://java.sun.com/jsp/jstl/core">

<body>
   <h:form id="form">
      <h:selectManyCheckbox value="#{formBean.selectedTextes}">
         <f:selectItem itemLabel="Option 1" itemValue="Option 1" /> 
            <f:selectItem itemLabel="Option 2" itemValue="Option 2" /> 
            <f:selectItem itemLabel="Option 3" itemValue="Option 3" /> 
      </h:selectManyCheckbox>

      <h:commandButton value="Save" action="#{formBean.saveTest}" />
   </h:form>
</body>
</html>



FormBean.java

Code:
@Named
@SessionScoped
public class FormBean implements Serializable {

   private static final long serialVersionUID = 6484233109393875203L;
   
   @EJB
   private ServiceBean serviceBean;
   
   private Test test;

   private Set<String> selectedTextes;

   public String saveTest() {
      serviceBean.save(test, selectedTextes);
      return "test";
   }
   
   public String createTest() {
      test = new Test();
      return "test";
   }
   
   // getters and setters
}


ServiceBean.java

Code:
@Stateless
@LocalBean
public class ServiceBean {

   @PersistenceContext
   private EntityManager entityManager;

   public boolean save(Test test, Set<String> selectedTextes) {
      Test dbTest = findTestById(test.getId());
      if (dbTest == null) {
         if (selectedTextes != null) {
            test.setTextes(selectedTextes);
         }
         entityManager.persist(test);
      }
      else {
         if (selectedTextes != null) {
            dbTest.setTextes(selectedTextes);
         }
         entityManager.merge(dbTest);
      }
      
      return true;
   }
   
   public Test findTestById(Long id) {
      if (id == null)
         return null;

      TypedQuery<Test> query = entityManager.createNamedQuery(Test.FIND_BY_ID, Test.class);
      query.setParameter("id", id);
      List<Test> results = query.getResultList();

      if (results.isEmpty())
         return null;

      return results.get(0);
   }
}


test_index.xhtml

Code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core"
   xmlns:c="http://java.sun.com/jsp/jstl/core">

<body>
   <h:form>
      <h:commandLink value="Test" action="#{formBean.createTest()}" />
   </h:form>
</body>
</html>


Nguyen
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