嗨，我对Hibernate很新，我得到了LazyInitiationException。如果你能给我一个如何解决这个问题的例子，请。我已经计算了dervied字段，我正在添加@transient，但似乎没有工作。你能告诉我如何使用它并在Jsf中传递它。
此外，如果DTO是要走的路。你能给我一个如何做DTO的例子，因为这不是我可以从db获得并创建一个视图的东西。任何帮助将不胜感激？
这是我的jsf：
<pe:dynaFormControl type="EMPLOYEE_VALUE" for="employeeDyna#{tab.id}-#{subtab.id}">
<p:autoComplete id="employeeDyna#{tab.id}-#{subtab.id}" scrollHeight="250" value="#{data.entityValue.employee}" converter="#{entityConverter}" completeMethod="#{autoCompletionBean.employeeAutoCompleteList}"
var="emp" itemLabel="#{emp.getFullName()}" itemValue="#{emp}" maxResults="500" dropdown="true" forceSelection="true" minQueryLength="2" queryDelay="800" required="#{data.cf.derived}" requiredMessage="#{secondEmployeeBean.getRequiredMessage(data.cf.name)}"
disabled="#{empty bean_Data.selectedAccount and !PARAM_OPTIONAL}">
<f:attribute name="selectedAccount" value="#{bean_Data.selectedAccount}" />
</p:autoComplete>
</pe:dynaFormControl>
这是我的实体类：
import java.beans.Transient;
@Entity
@Table(name = "EMPLOYEE")
public class Employee extends AbstractIdentity {
@Enumerated(EnumType.ORDINAL)
@Column(name = "COMPANY_TYPE_CODE", insertable = false, updatable = false)
@Getter
private EEntityType companyTypeCode;
@Any(metaColumn = @Column(name = "COMPANY_TYPE_CODE"))
@AnyMetaDef(idType = "long", metaType = "long",
metaValues = {
@MetaValue(targetEntity = CLass1.class, value = EEntityType.CLass1_CODE),
@MetaValue(targetEntity = CLass2.class, value = EEntityType.CLass2_CODE),
@MetaValue(targetEntity = CLass3.class, value = EEntityType.CLass3_CODE),
@MetaValue(targetEntity = CLass4.class, value = EEntityType.CLass4_CODE),
})
@JoinColumn(name = "COMPANY_ID")
@BatchSize(size = AppConfig.BATCH_SIZE)
@Getter
@Setter
private AbstractCompany entityCompany;
@Transient
public String getFullName(boolean withCompany) {
StringBuffer stringBuffer = new StringBuffer(getName());
if (withCompany) {
if (null != getEntityCompany() && !getEntityCompany().getName().trim().equals("")) {
stringBuffer.append(" - ");
stringBuffer.append(getEntityCompany().getName());
}
}
return stringBuffer.toString();
}
}
这是错误：
javax.el.ELException: /includes/components/customFieldEditView.xhtml @76,70 itemLabel="#{emp.getFullName()}": org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at org.primefaces.component.autocomplete.AutoComplete.getItemLabel(AutoComplete.java:162)
at org.primefaces.component.autocomplete.AutoCompleteRenderer.encodeInput(AutoCompleteRenderer.java:212)
at org.primefaces.component.autocomplete.AutoCompleteRenderer.encodeSingleMarkup(AutoCompleteRenderer.java:154)
at org.primefaces.component.autocomplete.AutoCompleteRenderer.encodeMarkup(AutoCompleteRenderer.java:137)
at org.primefaces.component.autocomplete.AutoCompleteRenderer.encodeEnd(AutoCompleteRenderer.java:115)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at org.primefaces.extensions.component.dynaform.DynaFormRenderer.encodeBody(DynaFormRenderer.java:283)
at org.primefaces.extensions.component.dynaform.DynaFormRenderer.encodeMarkup(DynaFormRenderer.java:115)
at org.primefaces.extensions.component.dynaform.DynaFormRenderer.encodeEnd(DynaFormRenderer.java:80)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:89)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeContent(FieldsetRenderer.java:94)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeMarkup(FieldsetRenderer.java:76)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeEnd(FieldsetRenderer.java:47)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:89)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeContent(FieldsetRenderer.java:94)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeMarkup(FieldsetRenderer.java:76)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeEnd(FieldsetRenderer.java:47)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:89)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeRow(PanelGridRenderer.java:196)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeStaticBody(PanelGridRenderer.java:151)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableBody(PanelGridRenderer.java:104)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableLayout(PanelGridRenderer.java:65)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:37)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:85)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeContent(FieldsetRenderer.java:94)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeMarkup(FieldsetRenderer.java:76)
at org.primefaces.component.fieldset.FieldsetRenderer.encodeEnd(FieldsetRenderer.java:47)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:89)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:206)
at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:123)
at org.primefaces.component.panel.PanelRenderer.encodeEnd(PanelRenderer.java:58)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:322)
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:57)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
at org.omnifaces.context.OmniPartialViewContext.processPartial(OmniPartialViewContext.java:143)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:432)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at org.springframework.faces.support.LifecycleWrapper.render(LifecycleWrapper.java:54)
at org.springframework.faces.webflow.JsfView.render(JsfView.java:87)
at org.springframework.webflow.engine.ViewState.render(ViewState.java:293)
at org.springframework.webflow.engine.ViewState.doEnter(ViewState.java:185)
at org.springframework.webflow.engine.State.enter(State.java:194)
at org.springframework.webflow.engine.Transition.execute(Transition.java:228)
at org.springframework.webflow.engine.DecisionState.doEnter(DecisionState.java:51)
at org.springframework.webflow.engine.State.enter(State.java:194)
at org.springframework.webflow.engine.Flow.start(Flow.java:527)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:368)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.start(RequestControlContextImpl.java:234)
at org.springframework.webflow.engine.SubflowState.doEnter(SubflowState.java:101)
at org.springframework.webflow.engine.State.enter(State.java:194)
at org.springframework.webflow.engine.Transition.execute(Transition.java:228)
at org.springframework.webflow.engine.DecisionState.doEnter(DecisionState.java:51)
at org.springframework.webflow.engine.State.enter(State.java:194)
at org.springframework.webflow.engine.Transition.execute(Transition.java:228)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:395)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:552)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:390)
at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:231)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:195)
at org.springframework.webflow.engine.Flow.resume(Flow.java:537)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:253)
at org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:57)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:100)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at com.abc.web.filter.abcWebAppFilter.doFilter(abcWebAppFilter.java:64)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:155)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:82)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:178)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: javax.el.ELException: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at javax.el.BeanELResolver.invoke(BeanELResolver.java:164)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:79)
at org.apache.el.parser.AstValue.getValue(AstValue.java:159)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
... 182 more
答案 0 :(得分：1)
我的问题是：您的Employee实体与AbstractCompany的关系是什么？作为一个单值对象（不是集合类型），我假设它可以是一对一或多对一。
根据堆栈跟踪判断，您有延迟加载问题。默认情况下，无论关联映射如何，Hibernate都会执行延迟加载。
默认情况下，Hibernate使用延迟选择提取集合和 延迟代理获取单值关联。这些默认值 对大多数应用程序中的大多数关联都有意义。
我认为代码中的问题是这样的：
getEntityCompany().getName()方法中的getFullName。您试图访问延迟加载的实体（AbstractCompany）的属性。一旦你在Hibernate会话/事务之外就不能这样做。
您有两个选择：
1）EAGER加载关系
@ManyToOne(fetch=FetchType.EAGER)
private AbstractCompany entityCompany;
或者如果您使用一对一（这就是为什么我首先询问Employee和AbstractCompany之间的关系类型）
@OneToOne(fetch=FetchType.EAGER)
private AbstractCompany entityCompany;
2）在Hibernate会话中加载关系
Hibernate.initialize(employee.getEntityCompany());
答案 1 :(得分：0)
您收到此异常是因为您尝试加载用于检索数据的事务之外的字段。
当hibernate检索数据时，它将为字段创建代理实体。当第一次访问其中一个代理时，hibernate将发送一个新请求来获取这个特定的数据。问题是，一旦事务关闭，hibernate就无法做到这一点。
您需要确保您的数据库请求也加载您感兴趣的字段（渴望注释或加入查询），或者您需要事先检索此数据（在事务中访问它或初始化代理，仍然在交易中）。
由于您要将此数据发送到视图，我建议使用外观。 外观将包含您的页面需要构建的所有数据。因此，在您的服务中，您可以将交易结果转换为您的网页可以使用的外观。
Facade几乎只是一个存储数据的POJO。