Upgrading from Spring 2.5 to 3.1

I spent a couple hours yesterday upgrading my applications from Spring 2.5.5 to Spring 3.1.1.  As described in the Spring 3.1 documentation, I replaced my Spring 2.5.5 spring.jar with the appropriate org.springframework.<module>-3.1.1.RELEASE.jar files.

The only error I encountered was when starting up my application on Tomcat 6.0.35 was java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInterceptor.

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:JNDIProperty.xml]
Offending resource: ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [JNDIProperty.xml]; nested exception is java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInterceptor
 at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
 at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
 at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76)
 at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:245)
 at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:196)
 at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:181)
 at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
 at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
 at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
 at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
 at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
 at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
 at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
 at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
 at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
 at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
 at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
 at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
 at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
 at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385)
 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284)
 at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
 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.deployWAR(HostConfig.java:943)
 at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
 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 org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

I did a Google search and found that I needed to include aopalliance-1.0.jar on the classpath.  I should mention that this is mentioned in the link above but I had missed it.

Once I fixed that exception, I did not have any more problems.  It was very simple to upgrade to Spring 3.1.  Excellent work Spring team!