我有一組字符串來保存和編輯selectManyCheckbox的值。我使用註釋@ElementCollection在 http://docs.oracle.com/javaee/6/tutorial/doc/bnbqa.html 描述我可以在第一時間通過,但在第二次節省時間節省,我得到了以下異常:ElementCollection:未能延遲初始化一個集合,沒有會話或
產生的原因:javax.servlet.ServletException:未能懶洋洋地初始化 集合,沒有會話或會話被關閉在 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.catali na.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:]在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.10.Final.jar:]在 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.internalDoFil ter(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 org.hibernate.LazyInitializationException:通過更造成無法懶洋洋地初始化 的集合,沒有會話或會話在 org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393) [休眠核心被關閉-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-im pl-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] 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更多
我使用JBoss 7.1.0決賽,休眠4.0.1.Final和JSF 2.0
以下是我的代碼:
Test.java
@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
<?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>
以下是相關來源:
FormBean.java
@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
@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
<?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>
感謝幫助 阮
拒絕編輯(這應該是一個評論)由[dc360(http://stackoverflow.com/users/1352408/dc360 ):你能否也請說出你改變了什麼?您發佈的鏈接雖然很好,但長達幾頁。 – Kapep 2012-07-21 23:23:13