启动 tomcat 出现：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [springcontext-config.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: org.logicalcobwebs.proxool.ConnectionPoolDefinition.setJmx(Z)V
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:187)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1213)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1053)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1018)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:566)
... 39 more
Caused by: java.lang.NoSuchMethodError: org.logicalcobwebs.proxool.ConnectionPoolDefinition.setJmx(Z)V
at org.logicalcobwebs.proxool.ProxoolDataSource.registerPool(ProxoolDataSource.java:133)
at org.logicalcobwebs.proxool.ProxoolDataSource.getConnection(ProxoolDataSource.java:94)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcServicesImpl.java:279)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:124)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1930)
at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:372)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:454)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:439)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
... 50 more
开始只有0.8.3， 出现ClassNotFound: ProxoolDataSource xxx
后面 去掉了0.8.3，加上了 0.9.0RC3，那个错误没有了，又出现了新的错误。。。
真是奇怪啊！ 难道需要换回0.8 ？ 。。 可是， 我查找 这个方法也是存在的啊！
重新部署了， 还是一样的啊！
D:codewsspring.metadata.me_tcatwebappsktb2WEB-INFlib 一看， 竟然有多个 proxool 的jar ， 那个0.8 的还在！ 我明白了！
找那个的时候， 系统找到了0.9， 但是找那个方法的时候， 加载到了 0.8 的那个， 于是。。。
把D:codewsspring.metadata.me_tcatwebappsktb2WEB-INFlib 下的 0.8 的jar 删除就好了！
myeclipse 真是 坑爹！
为什么会这样！！
其实之前也有研究过， myeclipse 的 redeploy 有三种方式， 分别是
默认就是 不删除， 即使是没用的jar —— classpath 中不存在的， 也有保留。 于是就发生这样的悲剧。。。