Hibernate collection is not associated with any session

Question

I have found several questions and answers with regard to this issue on SO, but they all seem to cover one major cause of the problem: fetching a collection outside of a transaction or within another transaction. But in my case, I am fetching within the same transaction when fetching a parent object and collection.

@Service
@Transactional
public class IntegrationServiceImpl implements IntegrationService {
@Override
    public Integration getIntegrationByIdFetchBackendParameters(Long integrationId) {
        Integration integration = integrationDao.get(integrationId);
        //not all integrations have to have backend.
        if (integration.getBackend() != null) {
            Hibernate.initialize(integration.getBackend().getBackendParameters());
        }
        return integration;
    }
...

But when it comes to Hibernate.initialize this branch in org.hibernate.collection.internal.AbstractPersistentCollection is executed

if ( session == null ) {
                throw new HibernateException( "collection is not associated with any session" );
            }

I cant see why session is null. Would someone explain this and suggest a solution?

EDIT 1 - Full stack trace

org.hibernate.HibernateException: collection is not associated with any session
        at org.hibernate.collection.internal.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:676)
        at org.hibernate.Hibernate.initialize(Hibernate.java:77)
        at com.dhl.finFw.service.IntegrationServiceImpl.getIntegrationByIdFetchBackendParameters(IntegrationServiceImpl.java:169)
        at com.dhl.finFw.web.integration.IntegrationOverviewManagedBean.loadIntegration(IntegrationOverviewManagedBean.java:59)
        at com.dhl.finFw.web.integration.AbstractIntegrationManagedBean.initCommonFields(AbstractIntegrationManagedBean.java:69)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:344)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:295)
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:130)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:399)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1481)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
        at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:333)
        at com.dhl.finFw.spring.scope.ViewScope.get(ViewScope.java:30)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:329)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117)
        at org.springframework.beans.factory.access.el.SpringBeanELResolver.getValue(SpringBeanELResolver.java:56)
        at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
        at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
        at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72)
        at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
        at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
        at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:68)
        at org.apache.el.parser.AstValue.getValue(AstValue.java:161)
        at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
        at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
        at com.sun.faces.facelets.tag.jstl.core.ForEachHandler.apply(ForEachHandler.java:161)
        at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
        at com.sun.faces.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:166)
        at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
        at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:87)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:320)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:379)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:358)
        at com.sun.faces.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:199)
        at com.sun.faces.facelets.tag.ui.IncludeHandler.apply(IncludeHandler.java:120)
        at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
        at com.sun.faces.facelets.tag.ui.DefineHandler.applyDefinition(DefineHandler.java:106)
        at com.sun.faces.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:178)
        at com.sun.faces.facelets.impl.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:395)
        at com.sun.faces.facelets.impl.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:366)
        at com.sun.faces.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:111)
        at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
        at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
        at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:187)
        at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
        at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
        at com.sun.faces.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:179)
        at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
        at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
        at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:87)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:320)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:379)
        at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:358)
        at com.sun.faces.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:199)
        at com.sun.faces.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:155)
        at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
        at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:87)
        at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:164)
        at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:870)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:99)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.dhl.finFw.web.filter.FileNotFoundFilter.doFilter(FileNotFoundFilter.java:40)
        at com.dhl.finFw.web.filter.FileNotFoundFilter.doFilter(FileNotFoundFilter.java:35)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:64)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
        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:99)
        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:1023)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)

Edit 2 - configuration

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

    <bean id="environmentVariablesConfiguration"
          class="org.jasypt.encryption.pbe.config.EnvironmentStringPBEConfig">
        <property name="algorithm" value="PBEWithMD5AndDES" />
        <property name="passwordSysPropertyName" value="APP_ENCRYPTION" />
    </bean>

    <bean id="configurationEncryptor"
          class="org.jasypt.encryption.pbe.StandardPBEStringEncryptor">
        <property name="config" ref="environmentVariablesConfiguration" />
    </bean>


    <bean id="propertyConfigurer"
          class="org.jasypt.spring31.properties.EncryptablePropertyPlaceholderConfigurer">
        <constructor-arg ref="configurationEncryptor" />
        <property name="locations">
            <list>
                <value>${finFw.config.location}finFwUI.properties</value>
                <value>classpath:application.properties</value>
                <value>classpath:dateTime.properties</value>
            </list>
        </property>
        <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
    </bean>

    <context:component-scan base-package="com.dhl.finFw"/>

    <context:annotation-config/>

    <tx:annotation-driven/>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="persistenceUnitName" value="FINFW"/>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="generateDdl" value="${finFwUI.orm.generateDdl:false}"/>
                <property name="showSql" value="${finFwUI.orm.showSql:false}"/>
                <property name="databasePlatform" value="${finFwUI.orm.dialect}"/>
            </bean>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

    <aop:aspectj-autoproxy/>

    <bean class="org.springframework.beans.factory.config.CustomScopeConfigurer">
        <property name="scopes">
            <map>
                <entry key="view">
                    <bean class="com.dhl.finFw.spring.scope.ViewScope"/>
                </entry>
            </map>
        </property>
    </bean>

    <bean class="org.springframework.web.context.support.ServletContextAttributeExporter">
        <property name="attributes">
            <map>
                <entry key="finFwUIEnvironment" value="${finFwUI.environment}" />
            </map>
        </property>
    </bean>

    <bean id="eventListenerBean" class="com.dhl.finFw.spring.FinFwApplicationListener" />

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name>FinFwUI</display-name>
    <description>Financial Framework Configuration</description>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet>
        <servlet-name>fileServlet</servlet-name>
        <servlet-class>com.dhl.finFw.web.FileServlet</servlet-class>
    </servlet>
    <!-- Location of the Log4J config file, for initialization and refresh checks.
        Applied by Log4jConfigListener. The variable is replaced with System property 
        at runtime. -->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>${finFw.config.location}log4j-finFwUI.properties</param-value>
    </context-param>
    <!-- Application version. The variable is replaced during Maven build. -->
    <context-param>
        <param-name>applicationVersion</param-name>
        <param-value>${applicationVersion}</param-value>
    </context-param>
    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>dhl</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.FACELETS_SKIP_COMMENTS</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
        <param-value>/WEB-INF/springsecurity.taglib.xml</param-value>
    </context-param>

    <!-- possible values: Development, Production, SystemTest, UnitTest The 
        variable is replaced during Maven build or set as System property during 
        development. -->
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>${finFwUI.jsf.stage}</param-value>
    </context-param>
    <!-- Spring application context config locations -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:com/dhl/finFw/finFwUI-core.xml
            classpath:com/dhl/finFw/finFwUI-dataSource.xml
            classpath:com/dhl/finFw/finFwUI-security.xml
            classpath:com/dhl/finFw/finFwUI-forms.xml
            classpath:com/dhl/finFw/finFwUI-audit.xml
        </param-value>
    </context-
    <context-param>
        <param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
        <param-value>true</param-value>
    </context-param>
    <session-config>
        <session-timeout>60</session-timeout>
    </session-config>
    <!-- Configures Log4J for this web app. As this context specifies a context-param
        "log4jConfigLocation", its file path is used to load the Log4J configuration. -->
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>
    <!-- Starts Spring application context. The parent one. The web context 
        is started by Dispatcher servlet. -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class>
    </listener>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>fileServlet</servlet-name>
        <url-pattern>/file/*</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>/pages/protected/index.xhtml</welcome-file>
    </welcome-file-list>
    <filter>
        <filter-name>encoding-filter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter>
        <filter-name>fileNotFoundFilter</filter-name>
        <filter-class>com.dhl.finFw.web.filter.FileNotFoundFilter</filter-class>
    </filter>

    <filter>
        <filter-name>browserCacheControlFilter</filter-name>
        <filter-class>com.dhl.finFw.web.filter.BrowserCacheControlFilter</filter-class>
    </filter>
    <filter>
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
    </filter-mapping>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>encoding-filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>fileNotFoundFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>browserCacheControlFilter</filter-name>
        <url-pattern>/pages/protected/integration/subscriptionScheduler.xhtml</url-pattern>
    </filter-mapping>

    <error-page>
        <exception-type>org.springframework.security.access.AccessDeniedException</exception-type>
        <location>/pages/public/error/accessDenied.xhtml</location>
    </error-page>
    <error-page>
        <exception-type>java.lang.Throwable</exception-type>
        <location>/pages/public/error/internal.xhtml</location>
    </error-page>
    <error-page>
        <error-code>500</error-code>
        <location>/pages/public/error/internal.xhtml</location>
    </error-page>
    <error-page>
        <error-code>404</error-code>
        <location>/pages/public/error/notFound.xhtml</location>
    </error-page>
    <error-page>
        <error-code>403</error-code>
        <location>/pages/public/error/accessDenied.xhtml</location>
    </error-page>
</web-app>

ViewScope.java

public class ViewScope implements Scope {

    private Logger logger = LoggerFactory.getLogger(getClass());

    public static final String VIEW_SCOPE_CALLBACKS = "viewScope.callbacks";

    @Override
    public Object get(String name, ObjectFactory<?> objectFactory) {
        Map<String, Object> viewMap = getViewMap();
        Object instance = viewMap.get(name);
        if (instance == null) {
            instance = objectFactory.getObject();
            synchronized (viewMap) {
                viewMap.put(name, instance);
                logger.debug("Bean '{}' has been put to ViewScope.", instance);
            }
        } else {
            logger.debug("Going to return an existing bean '{}'", instance);
        }
        return instance;
    }


    @Override
    public Object remove(String name) {
        Object instance = getViewMap().remove(name);
        if (instance != null) {
            Map<String, Runnable> callbacks = (Map<String, Runnable>) getViewMap().get(VIEW_SCOPE_CALLBACKS);
            if (callbacks != null) {
                callbacks.remove(name);
                logger.debug("Bean '{}' has been removed.", instance);
            }
        }
        return instance;
    }

    @Override
    public void registerDestructionCallback(String name, Runnable runnable) {
        Map<String, Runnable> callbacks = (Map<String, Runnable>) getViewMap().get(VIEW_SCOPE_CALLBACKS);
        if (callbacks != null) {
            callbacks.put(name, runnable);
            logger.debug("Registered callback for '{}'", name);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Object resolveContextualObject(String name) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        FacesRequestAttributes facesRequestAttributes = new FacesRequestAttributes(facesContext);
        return facesRequestAttributes.resolveReference(name);
    }

    @Override
    public String getConversationId() {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        FacesRequestAttributes facesRequestAttributes = new FacesRequestAttributes(facesContext);
        return facesRequestAttributes.getSessionId() + "-" + facesContext.getViewRoot().getViewId();
    }

    private Map<String, Object> getViewMap() {
        return FacesContext.getCurrentInstance().getViewRoot().getViewMap();
    }

}

Answer 1

I fixed this issue just putting @Transactional at top of the method.

Answer 2

To prevent a LazyLoadingException in my application, I use a helper method that first merges the entity back to the session and then initializes the requested collections. It recently turned out, that sometimes it still suffers from the "collection is not associated with any session" issue despite the session seems to be open and looks fine overall. It's hard for me to say what is the cause of such behavior, but still I found a remedy against it. Try to refresh the entity state before fetching the lazy collection using session.refresh(entity). This will cause Hibernate to reload your entity from the DB. After doing this, your current session will let you to load your collections smoothly with Hibernate.initialize().

Answer 3

As @Zmicier Zaleznicenka has pointed out, this exception message may have nothing to do with the Session. We have also encountered this problem, but the root cause was the entity primary key setting defined in the mapping file was incorrect. For example, in the following code, the database column "Foo_SK" is not the unique identifier of the table.

Id(x => x.Id, "Foo_SK").GeneratedBy.Assigned();

In our case, we have no control over the database schema. Therefore, we fixed the problem by using composite key mapping.

Please check the other post for the same issue.