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说的很详细,结构是比较简单,好懂...
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写的太好了。
http协议和web本质
仿百度贴吧项目实战错误分析
项目开发错误分析
这个错误是我在项目开发中遇到的次数最多的一个bug
org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting foridle object
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at cn.csdn.clb.changliaoba.util.JdbcUtil.getConn(JdbcUtil.java:32)
at cn.csdn.clb.changliaoba.dao.ManagerDaoImpl.findCountRecord(ManagerDaoImpl.java:222)
at cn.csdn.clb.changliaoba.service.ManagerServiceImpl.findCountRecord(ManagerServiceImpl.java:53)
at cn.csdn.clb.changliaoba.servlet.ManagerListServlet.doGet(ManagerListServlet.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
atorg.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:825)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
... 23 more
org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting foridle object
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at cn.csdn.clb.changliaoba.util.JdbcUtil.getConn(JdbcUtil.java:32)
at cn.csdn.clb.changliaoba.dao.ManagerDaoImpl.findCountRecord(ManagerDaoImpl.java:222)
at cn.csdn.clb.changliaoba.dao.ManagerDaoImpl.findCountPage(ManagerDaoImpl.java:237)
at cn.csdn.clb.changliaoba.service.ManagerServiceImpl.findCountPage(ManagerServiceImpl.java:59)
at cn.csdn.clb.changliaoba.servlet.ManagerListServlet.doGet(ManagerListServlet.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
atorg.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:825)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
... 24 more
2011-12-1 11:08:35org.apache.catalina.core.StandardWrapperValve invoke
严重:Servlet.service() for servlet [ManagerListServlet] in context with path [/CLB]threw exception
java.lang.NullPointerException
at cn.csdn.clb.changliaoba.dao.ManagerDaoImpl.findCountPage(ManagerDaoImpl.java:238)
at cn.csdn.clb.changliaoba.service.ManagerServiceImpl.findCountPage(ManagerServiceImpl.java:59)
at cn.csdn.clb.changliaoba.servlet.ManagerListServlet.doGet(ManagerListServlet.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
atorg.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
连接池被占满了，解决这个问题可以增加连接池连接个数，但如果程序有问题，没有释放连接，那你增加多少最终还是会有这错。发现在释放资源的时候没有释放connection对象。
插入错误
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:Table 'changliaoba.book' doesn't exist
atsun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
atsun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
atsun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
atjava.lang.reflect.Constructor.newInstance(Unknown Source)
atcom.mysql.jdbc.Util.handleNewInstance(Util.java:411)
atcom.mysql.jdbc.Util.getInstance(Util.java:386)
atcom.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
atcom.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3597)
atcom.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3529)
atcom.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1990)
atcom.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2151)
atcom.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2625)
atcom.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2333)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2318)
atorg.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
atcn.csdn.clb.changliaoba.dao.ManagerDaoImpl.regeister(ManagerDaoImpl.java:37)
atcn.csdn.clb.changliaoba.junit.ManagerTest.register(ManagerTest.java:22)
atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
atjava.lang.reflect.Method.invoke(Unknown Source)
atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
atorg.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
atorg.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
atorg.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
atorg.junit.runners.ParentRunner.run(ParentRunner.java:236)
atorg.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
插入失败
Table 'changliaoba.book' doesn't exist
把changliaoba改成manager
java.lang.NullPointerException
atcn.csdn.clb.changliaoba.dao.TieziDaoImpl.findById(TieziDaoImpl.java:165)
atcn.csdn.clb.changliaoba.service.TieziServiceImpl.findById(TieziServiceImpl.java:34)
atcn.csdn.clb.changliaoba.junit.TieziTest.findById(TieziTest.java:38)
atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
atjava.lang.reflect.Method.invoke(Unknown Source)
atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
atorg.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
atorg.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
atorg.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
atorg.junit.runners.ParentRunner.run(ParentRunner.java:236)
atorg.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
java.lang.NullPointerException
atcn.csdn.clb.changliaoba.dao.TieziDaoImpl.findAll(TieziDaoImpl.java:125)
atcn.csdn.clb.changliaoba.service.TieziServiceImpl.findAll(TieziServiceImpl.java:28)
atcn.csdn.clb.changliaoba.junit.TieziTest.findAll(TieziTest.java:50)
atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
atjava.lang.reflect.Method.invoke(Unknown Source)
atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
atorg.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
atorg.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
atorg.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
atorg.junit.runners.ParentRunner.run(ParentRunner.java:236)
atorg.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
记录更新失败
获取连接对象
conn = pstmt.getConnection(); 改成 conn = JdbcUtil.getConn();
这个错误是数据库连接错误相信很多同学在插入向数据库中插入错误时，都会或多或少的出现这个问题，其实出现这个错误并不意味着你代码写的有问题，而是在你向这个表中插入数据时，外键关联的表中没有数据，所以解决方法很简单就是现在关联表中插入数据。
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:Cannot add or update a child row: a foreign key constraint fails(`changliaoba`.`baruser`, CONSTRAINT `baruser_ibfk_1` FOREIGN KEY (`barid`)REFERENCES `bar` (`id`))
atsun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
atsun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
atsun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(UnknownSource)
atcom.mysql.jdbc.Util.handleNewInstance(Util.java:411)
atcom.mysql.jdbc.Util.getInstance(Util.java:386)
atcom.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3597)
atcom.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3529)
atcom.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1990)
atcom.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2151)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2625)
atcom.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2333)
atcom.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2318)
atorg.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
atcn.csdn.clb.changliaoba.dao.BarUserDaoImpl.insert(BarUserDaoImpl.java:38)
atcn.csdn.clb.changliaoba.service.BarUserServiceImpl.insert(BarUserServiceImpl.java:15)
atcn.csdn.clb.changliaoba.junit.BarUserTest.insert(BarUserTest.java:26)
atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(UnknownSource)
atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
atorg.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
atorg.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
atorg.junit.runners.ParentRunner.run(ParentRunner.java:236)
atorg.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
空指针问题是最我们组在项目开发中经常遇到的问题，如下我们就出现了这种很简单的小问题，解决这种小问题就需要我们认真仔细的检查一下是不是拼写错误，因为拼写错误导致空指针的几率是最大的。
java.lang.NullPointerException
at cn.csdn.clb.changliaoba.junit.BarUserTest.findById(BarUserTest.java:38)
atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(UnknownSource)
atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
atorg.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
atorg.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
atorg.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
下面这种错误，如果你在启动tomcat未完成时，就又重启了，就很容易造成这种问题了，所以很简单重新启动一下tomcat吧~
Èý
¾¯¸æ:Error during context [/CLB] restart
org.apache.catalina.LifecycleException:Failed to start component[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/CLB]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
atorg.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1279)
atorg.apache.catalina.startup.HostConfig.check(HostConfig.java:1367)
atorg.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:294)
atorg.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
atorg.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
atorg.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1242)
atorg.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1400)
atorg.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1410)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1389)
at java.lang.Thread.run(Thread.java:662)
Causedby: java.lang.NoClassDefFoundError: javax/faces/webapp/FacesServlet
atcom.sun.faces.config.FacesInitializer.<clinit>(FacesInitializer.java:103)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
atorg.apache.catalina.startup.ContextConfig.getServletContainerInitializer(ContextConfig.java:1543)
at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1466)
atorg.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1285)
atorg.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:896)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:322)
atorg.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
atorg.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
atorg.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5103)
atorg.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:148)
... 10 more
Causedby: java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet
atorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
atorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
... 22 more
j
错误比较简单，仅供初学者参考。
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