不知道为什么,接口加载不进去!

错误信息:严重: Error initializing XFireServlet.
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.codehaus.xfire.spring.ServiceBean' defined in class path resource [META-INF/xfire/services.xml]: Initialization of bean failed; nested exception is org.codehaus.xfire.XFireRuntimeException: Cannot create mapping for java.util.List, unspecified component type for return type of method SelectBook in interface lg.dao.BookDao
org.codehaus.xfire.XFireRuntimeException: Cannot create mapping for java.util.List, unspecified component type for return type of method SelectBook in interface lg.dao.BookDao
at org.codehaus.xfire.aegis.type.DefaultTypeCreator.createCollectionType(DefaultTypeCreator.java:43)
at org.codehaus.xfire.aegis.type.java5.Java5TypeCreator.createCollectionType(Java5TypeCreator.java:139)
at org.codehaus.xfire.aegis.type.XMLTypeCreator.createCollectionType(XMLTypeCreator.java:116)
at org.codehaus.xfire.aegis.type.AbstractTypeCreator.createTypeForClass(AbstractTypeCreator.java:113)
at org.codehaus.xfire.aegis.type.AbstractTypeCreator.createType(AbstractTypeCreator.java:356)
at org.codehaus.xfire.aegis.AegisBindingProvider.getSuggestedName(AegisBindingProvider.java:255)
at org.codehaus.xfire.service.binding.DefaultServiceConfiguration.getOutParameterName(DefaultServiceConfiguration.java:176)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.getOutParameterName(ObjectServiceFactory.java:1078)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.addOperation(ObjectServiceFactory.java:836)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.initializeOperations(ObjectServiceFactory.java:761)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.create(ObjectServiceFactory.java:444)
at org.codehaus.xfire.spring.ServiceBean.afterPropertiesSet(ServiceBean.java:176)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1059)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:363)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:275)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:320)
at org.codehaus.xfire.spring.XFireConfigLoader.getXFireApplicationContext(XFireConfigLoader.java:107)
at org.codehaus.xfire.spring.XFireConfigLoader.loadContext(XFireConfigLoader.java:41)
at org.codehaus.xfire.transport.http.XFireConfigurableServlet.loadConfig(XFireConfigurableServlet.java:86)
at org.codehaus.xfire.transport.http.XFireConfigurableServlet.createXFire(XFireConfigurableServlet.java:54)
at org.codehaus.xfire.transport.http.XFireServlet.init(XFireServlet.java:45)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:809)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
at java.lang.Thread.run(Thread.java:619)
2010-7-23 0:27:29 org.apache.catalina.core.StandardWrapperValve invoke
严重: Allocate exception for servlet XFireServlet
org.codehaus.xfire.XFireRuntimeException: Cannot create mapping for java.util.List, unspecified component type for return type of method SelectBook in interface lg.dao.BookDao
at org.codehaus.xfire.aegis.type.DefaultTypeCreator.createCollectionType(DefaultTypeCreator.java:43)
at org.codehaus.xfire.aegis.type.java5.Java5TypeCreator.createCollectionType(Java5TypeCreator.java:139)
at org.codehaus.xfire.aegis.type.XMLTypeCreator.createCollectionType(XMLTypeCreator.java:116)
at org.codehaus.xfire.aegis.type.AbstractTypeCreator.createTypeForClass(AbstractTypeCreator.java:113)
at org.codehaus.xfire.aegis.type.AbstractTypeCreator.createType(AbstractTypeCreator.java:356)
at org.codehaus.xfire.aegis.AegisBindingProvider.getSuggestedName(AegisBindingProvider.java:255)
at org.codehaus.xfire.service.binding.DefaultServiceConfiguration.getOutParameterName(DefaultServiceConfiguration.java:176)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.getOutParameterName(ObjectServiceFactory.java:1078)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.addOperation(ObjectServiceFactory.java:836)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.initializeOperations(ObjectServiceFactory.java:761)
at org.codehaus.xfire.service.binding.ObjectServiceFactory.create(ObjectServiceFactory.java:444)
at org.codehaus.xfire.spring.ServiceBean.afterPropertiesSet(ServiceBean.java:176)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1059)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:363)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:275)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:320)
at org.codehaus.xfire.spring.XFireConfigLoader.getXFireApplicationContext(XFireConfigLoader.java:107)
at org.codehaus.xfire.spring.XFireConfigLoader.loadContext(XFireConfigLoader.java:41)
at org.codehaus.xfire.transport.http.XFireConfigurableServlet.loadConfig(XFireConfigurableServlet.java:86)
at org.codehaus.xfire.transport.http.XFireConfigurableServlet.createXFire(XFireConfigurableServlet.java:54)
at org.codehaus.xfire.transport.http.XFireServlet.init(XFireServlet.java:45)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:809)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
at java.lang.Thread.run(Thread.java:619)