尽管我正在使用SpringOpenEntityManagerInViewFilter，但是在获得一些结果之后我得到了LazyInitializationException。 这个谜是我为什么得到第一个结果（行）然后它累了，我没有得到更多的结果。 我已经尝试了我在这里阅读的所有内容，我几乎已经阅读了所有帖子，我仍然被困在这里。 我是Spring数据jpa的新手，我怀疑它可能是一个废话 这些是我的文件：
的web.xml
.....
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config/*.xml</param-value>
</context-param>
<filter>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
<init-param>
<param-name>entityManagerFactoryBeanName</param-name>
<param-value>entityManagerFactory</param-value>
</init-param>
<init-param>
<param-name>flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
的applicationContext.xml
<context:annotation-config />
<jpa:repositories base-package="com.previsionx.web.repositories" />
<!-- Scan for all of Spring components such as Spring Service -->
<context:component-scan base-package="com.previsionx.web"> </context:component-scan>
<!-- Necessary to get the entity manager injected into the factory bean -->
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<!-- Define Hibernate JPA Vendor Adapter -->
<bean id="jpaVendorAdapter"
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform"
value="org.hibernate.dialect.MySQLDialect" />
</bean>
<!-- Entity Manager Factory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="previsionx"></property>
<property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
</bean>
<!-- Transaction Manager -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- Detect @Transactional -->
<tx:annotation-driven transaction-manager="transactionManager" />
PoSrvc.java
@Transactional
public class PoSrvc implements IPoSrvc {
@Autowired
private IPoRepository poRepository;
@Autowired
private IPoBuRepository poBuRepository;
@Override
@Transactional
public List<Po> getAllByBu(long buId) {
Set<Po> poSet = new LinkedHashSet<Po>();
poSet.addAll(poBuRepository.findPoByBuId(buId));
poSet.addAll(poRepository.findByCreatorBuId(buId));
List<Po> list = new LinkedList<Po>();
list.addAll(poSet);
return list;
}
IPoRepository.java
public interface IPoRepository extends JpaRepository<Po,Long>{
List<Po> findByCreatorBuId(long buId);
Po findById(long id);
IPoBuRepository.java
public interface IPoBuRepository extends JpaRepository<PoBu, Long> {
@Query("SELECT p FROM PoBu pb INNER JOIN pb.po p WHERE pb.po.id = p.id AND pb.bu.id=:id ORDER BY pb.po.ref")
List<Po> findPoByBuId(@Param("id") long id);
ManagePo.java
@ManagedBean
@ViewScoped
public class ManagePO implements Serializable {
......
@ManagedProperty("#{poSrvc}")
@Autowired
private IPoSrvc poSrvc;
@ManagedProperty("#{buSrvc}")
@Autowired
private IBuSrvc buSrvc;
@PostConstruct
public void init(){
this.readOnly=false;
poList = poSrvc.getAllByBu(appcontext.getBuId());
........
}
任何建议都是受欢迎的，因为我不知道该做什么：（
非常感谢您提前
编辑： 异常跟踪
GRAVE: Error Rendering View[/secure/managepo.xhtml]
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.previsionx.entities.Po.PoBuList, could not initialize proxy - no Session
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:572)
at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:212)
at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:153)
at org.hibernate.collection.internal.PersistentBag.size(PersistentBag.java:278)
at javax.faces.model.ListDataModel.isRowAvailable(ListDataModel.java:109)
at javax.faces.model.ListDataModel.setRowIndex(ListDataModel.java:184)
at javax.faces.model.ListDataModel.setWrappedData(ListDataModel.java:219)
at javax.faces.model.ListDataModel.<init>(ListDataModel.java:78)
at com.sun.faces.facelets.component.UIRepeat.getDataModel(UIRepeat.java:263)
at com.sun.faces.facelets.component.UIRepeat.setIndex(UIRepeat.java:523)
at com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:577)
at com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:1110)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at org.primefaces.component.column.Column.renderChildren(Column.java:304)
at org.primefaces.component.datatable.DataTableRenderer.encodeCell(DataTableRenderer.java:963)
at org.primefaces.component.datatable.DataTableRenderer.encodeRow(DataTableRenderer.java:919)
at org.primefaces.component.datatable.DataTableRenderer.encodeRows(DataTableRenderer.java:830)
at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:777)
at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:740)
at org.primefaces.component.datatable.feature.PageFeature.encode(PageFeature.java:36)
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:78)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)
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 org.primefaces.component.api.UIData.visitTree(UIData.java:692)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIForm.visitTree(UIForm.java:371)
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:60)
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:430)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
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 javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.previsionx.web.utils.NoCacheFilter.doFilter(NoCacheFilter.java:33)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:177)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分：0)
我使用Primefaces Lazy数据表解决了
问题似乎是，一旦呈现页面，hibernate会话就会被关闭。
服务，存储库和manageBean有点琐碎
服务：
@Component
public class PoSrvc implements IPoSrvc {
@Autowired
private IPoBuRepository poBuRepository;
@Override
@Transactional
public List<Po> getAllByBu(long buId, int page, int results, String sort, SortOrder sortOrder) {
Pageable pageable = new PageRequest(
page, results,new Sort(new Order(SortOrder.ASCENDING.equals(sortOrder)? Direction.ASC: Direction.DESC, "po."+sort))
);
return poBuRepository.findPoByBuId(buId,pageable);
}
@Override
public int getCountAllByBu(long buId) {
return poBuRepository.findCountAllByBuId(buId);
}
存储库：
public interface IPoBuRepository extends JpaRepository<PoBu, Long> {
@Query("SELECT DISTINCT po FROM PoBu pb WHERE (pb.bu.id=:id OR pb.po.creatorBu.id=:id) AND pb.po.deleted=false")
List<Po> findPoByBuId(@Param("id") long id,Pageable pageable);
@Query("SELECT COUNT (DISTINCT pb.po) FROM PoBu pb WHERE (pb.bu.id=:id OR pb.po.creatorBu.id=:id) AND pb.po.deleted=false")
int findCountAllByBuId(@Param("id") long id);
我的managedBean：
@ManagedBean
@ViewScoped
public class ManagePO implements Serializable {
private static final long serialVersionUID = 8947292155668339391L;
@ManagedProperty(value="#{appContext}")
private AppContext appcontext;
@ManagedProperty("#{poSrvc}")
private IPoSrvc poSrvc;
private LazyDataModel<Po> lazyModel;
@PostConstruct
public void init(){
this.readOnly=false;
this.lazyModel = new LazyPoDataModel(appcontext.getBuId(), poSrvc);
最后这是Lazy表模型：
public class LazyPoDataModel extends LazyDataModel<Po> {
private static final long serialVersionUID = 1L;
private long buId;
private IPoSrvc poSrvc;
public LazyPoDataModel(long buId, IPoSrvc poSrvc) {
super();
this.buId = buId;
this.poSrvc = poSrvc;
this.setRowCount(this.poSrvc.getCountAllByBu(buId));
}
@Override
public List<Po> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,Object> filters) {
List<Po> data = new LinkedList<Po>();
int page = first/pageSize;
if(sortField==null){
sortField = "ref";
}
data=poSrvc.getAllByBu(buId, page, pageSize, sortField, sortOrder);
return data;
}
现在不再抛出LazyInitializationException了！ 谢谢你的线索！
编辑： XHTML：
<p:dataTable id="po_tbl" value="#{managePO.lazyModel}" styleClass="order-table" headerClass="order-table-header" rowClasses="order-table-odd-row,order-table-even-row" var="po" style="width:1000px;"
resizableColumns="true" paginator="true"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
rowsPerPageTemplate="10,20,30,50" rows="10" lazy="true">
<p:column sortBy="#{po.ref}">
<!-- column header -->
<f:facet name="header">#{msg['tbl_hdr_po.manage_po']}</f:facet>
<!-- row record -->
<h:outputText value="#{po.ref}" />
</p:column>
<p:column styleClass="text-right">
<f:facet name="header">#{msg['tbl_hdr_total.manage_po']}</f:facet>
<h:outputText value="#{po.weight} #{po.weightUnit}" />
</p:column>
<p:column sortBy="#{po.product}">
<f:facet name="header">#{msg['tbl_hdr_product.manage_po']}</f:facet>
#{po.product}
</p:column>
<p:column sortBy="#{po.creatorBu.ref}">
<f:facet name="header">#{msg['tbl_hdr_creator.manage_po']}</f:facet>
#{po.creatorBu.ref}
</p:column>