SEVERE: Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: youkan.model.Orders

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1488)

	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$1.getObject(AbstractBeanFactory.java:295)

	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)

	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)

	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)

	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:608)

	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)

	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)

	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:389)

	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:294)

	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)

	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)

	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)

	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)

	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)

	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)

	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079)

	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002)

	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506)

	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)

	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)

	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)

	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)

	at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)

	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)

	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)

	at org.apache.catalina.core.StandardService.start(StandardService.java:525)

	at&n