做一个SSH为基础框架的webapp小DEMO，复制了一把以前可以跑的代码，竟发现无法初始化数据源，报错如下：

[ERROR][org.springframework.web.context.ContextLoader][main] 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 java.lang.NullPointerException

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1482)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)

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:610)

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:4135)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)

at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)

at org.apache.catalina.startup.Embedded.start(Embedded.java:825)

at org.codehaus.mojo.tomcat.AbstractRunMojo.startContainer(AbstractRunMojo.java:558)

at org.codehaus.mojo.tomcat.AbstractRunMojo.execute(AbstractRunMojo.java:255)

at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)

at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)

at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)

at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)

at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)

at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)

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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)

at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

Caused by: java.lang.NullPointerException

at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:207)

at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:76)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:132)

at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1822)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1780)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1865)

at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:247)

at org.springframework.orm.hibernate4.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:373)

at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:358)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1541)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1479)

... 42 more

2015-2-1 16:45:08 org.apache.catalina.core.StandardContext listenerStart

由于其中部分有jar包更新版本，故以为是jar包更新所致，查了1个多小时，无果，一直报这个错。

于是将原来可以跑的DEMO给跑起来，发现确实是可以跑的。将jar包更新成新的小DEMO也是可以跑的。

最后查看lib目录，发现新jar包里面多了一个oralce14.jar数据库连接驱动包。一下子想起来了，在架构老DEMO的时候由于当时手动放过oralce14.jar到lib，之后又改用了oracle5.jar并且手动删除了对oralce14.jar的依赖，却没有删除lib下的oracle14.jar包。

由于自己贪一时之快，直接复制的。真是抄近路掉坑啊！以后长记性了，新项目一定要删干净lib包。

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