请各位看下这是什么错？

HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Error creating bean with name 'exporter' defined in ServletContext resource [/WEB-INF/qa/applicationContext-management.xml]: Initialization of bean failed; nested exception is javax.management.InstanceAlreadyExistsException: Hibernate:name=Statistics
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:471)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'exporter' defined in ServletContext resource [/WEB-INF/qa/applicationContext-management.xml]: Initialization of bean failed; nested exception is javax.management.InstanceAlreadyExistsException: Hibernate:name=Statistics
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:365)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:223)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:277)
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:312)
org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:134)
org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:230)
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:156)
org.springframework.web.context.ContextLoaderServlet.init(ContextLoaderServlet.java:81)
javax.servlet.GenericServlet.init(GenericServlet.java:212)
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:634)
org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:561)
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:496)
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203)
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
org.apache.catalina.startup.Catalina.start(Catalina.java:552)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
root cause javax.management.InstanceAlreadyExistsException: Hibernate:name=Statistics
com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
org.springframework.jmx.export.MBeanExporter.registerMBean(MBeanExporter.java:389)
org.springframework.jmx.export.MBeanExporter.registerBeanInstance(MBeanExporter.java:365)
org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:345)
org.springframework.jmx.export.MBeanExporter.registerBeans(MBeanExporter.java:274)
org.springframework.jmx.export.MBeanExporter.afterPropertiesSet(MBeanExporter.java:217)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:966)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:358)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:223)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:277)
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:312)
org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:134)
org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:230)
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:156)
org.springframework.web.context.ContextLoaderServlet.init(ContextLoaderServlet.java:81)
javax.servlet.GenericServlet.init(GenericServlet.java:212)
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:634)
org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:561)
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:496)
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203)
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
org.apache.catalina.startup.Catalina.start(Catalina.java:552)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.33 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.5.33   这是什么原因导致的错误请指教？