关于spring事务的问题，高手请进啊。。。急。。。。
我是第一次使用spring+ibatis结果出现如下提示:(jpetstore项目）请高手分析一下是怎么回事啊。。。急啊。。。
javax.servlet.ServletException: Servlet.init() for servlet petstore threw exception
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
java.lang.Thread.run(Unknown Source)

root cause

org.springframework.beans.factory.BeanDefinitionStoreException: Error registering bean with name 'baseTransactionProxy' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: <property> element for property 'transactionAttributes' must specify a ref or value
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parsePropertyValue(DefaultXmlBeanDefinitionParser.java:780)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parsePropertyElement(DefaultXmlBeanDefinitionParser.java:722)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parsePropertyElements(DefaultXmlBeanDefinitionParser.java:621)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parseBeanDefinitionElement(DefaultXmlBeanDefinitionParser.java:464)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parseBeanDefinitionElement(DefaultXmlBeanDefinitionParser.java:432)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parseBeanDefinitions(DefaultXmlBeanDefinitionParser.java:347)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.registerBeanDefinitions(DefaultXmlBeanDefinitionParser.java:197)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:295)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:223)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:173)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:148)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.importBeanDefinitionResource(DefaultXmlBeanDefinitionParser.java:374)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.parseBeanDefinitions(DefaultXmlBeanDefinitionParser.java:338)
org.springframework.beans.factory.xml.DefaultXmlBeanDefinitionParser.registerBeanDefinitions(DefaultXmlBeanDefinitionParser.java:197)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:295)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:223)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:173)
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:148)
org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:129)
org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:145)
org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:126)
org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:89)