问题1:WebLogic下Mybatis Error building SqlSession
工程在Tomcat下正常运行，放到weblogic下启动失败。后来发现是weblogic下jar与项目/lib下jar冲突。于是在WEB-INF/下添加weblogic.xml文件，优先使用WEB-INF/lib下jar包。文件内容如下：
但添加后，原本可以正常使用的mybatis初始化不了SqlSession。把上面的文件删除就可以启动，加上就报错。异常如下：
调试源码最后发现XPathPaser类下DocumentBuilderFactory.newInstance在FactoryFinder.find时候返回类型为：org.apache.xerces.jaxp.DocumentBuilderFactory类。而在Weblogic下正常运行项目返回：weblogic.xml.jaxp.RegistryDocumentBuilderFactory类，
删除工程下xercesImpl-2.9.1-1.0.0.jar、xercesImpl-2.9.1-1.0.jar、xml-apis-1.0.b2-1.0.0.jar 三个jar。再启动项目问题解决。
<weblogic-web-app xmlns="http://www.bea.com/ns/weblogic/90" xmlns:j2ee="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic-web-app.xsd"> <container-descriptor> <prefer-web-inf-classes>true</prefer-web-inf-classes> </container-descriptor> </weblogic-web-app>
但添加后，原本可以正常使用的mybatis初始化不了SqlSession。把上面的文件删除就可以启动，加上就报错。异常如下：
<BEA-101162> <User defined listener com.lhd.framework.core.web.listener.StartupListner failed: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRoleBiz': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSysUserService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSysUserDao' defined in URL [zip:D:/oracle/Middleware/user_projects/domains/base_domain/servers/AdminServer/tmp/_WL_user/FlexPlatform/g6k8k4/war/WEB-INF/lib/_wl_cls_gen.jar!/com/lhd/demo/dao/user/TestSysUserDao.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [conf/spring-application.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ### The error may exist in SQL Mapper Configuration ### Cause: org.apache.ibatis.builder.BuilderException: Error evaluating XPath. Cause: javax.xml.xpath.XPathExpressionException. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRoleBiz': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSysUserService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSysUserDao' defined in URL [zip:D:/oracle/Middleware/user_projects/domains/base_domain/servers/AdminServer/tmp/_WL_user/FlexPlatform/g6k8k4/war/WEB-INF/lib/_wl_cls_gen.jar!/com/lhd/demo/dao/user/TestSysUserDao.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [conf/spring-application.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ### The error may exist in SQL Mapper Configuration ### Cause: org.apache.ibatis.builder.BuilderException: Error evaluating XPath. Cause: javax.xml.xpath.XPathExpressionException at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:300) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1064) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:574) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47) at com.lhd.framework.core.web.listener.StartupListner.contextInitialized(StartupListner.java:36) at weblogic.servlet.internal.EventsManager$FireContextListenerAction.run(EventsManager.java:481) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.internal.EventsManager.notifyContextCreatedEvent(EventsManager.java:181) at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1868) at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3154) at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1518) at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:484) at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52) at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119) at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200) at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:247) at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52) at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119) at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:27) at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:671) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52) at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212) at weblogic.application.internal.SingleModuleDeployment.activate(SingleModuleDeployment.java:44) at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161) at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79) at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:569) at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:150) at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:116) at weblogic.deploy.internal.targetserver.operations.StartOperation.doCommit(StartOperation.java:149) at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323) at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:844) at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1253) at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:440) at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:195) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:13) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:68) at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:545) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256) at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
调试源码最后发现XPathPaser类下DocumentBuilderFactory.newInstance在FactoryFinder.find时候返回类型为：org.apache.xerces.jaxp.DocumentBuilderFactory类。而在Weblogic下正常运行项目返回：weblogic.xml.jaxp.RegistryDocumentBuilderFactory类，
删除工程下xercesImpl-2.9.1-1.0.0.jar、xercesImpl-2.9.1-1.0.jar、xml-apis-1.0.b2-1.0.0.jar 三个jar。再启动项目问题解决。