日记：tomcat中的各种异常汇总以及Eclipse使用

1.Server Tomcat v8.0 Server at localhost failed to start.

. A child container failed during start

具体：查看异常

信息: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [301] milliseconds.

九月 27, 2015 9:56:11 下午 org.apache.catalina.core.ContainerBase startInternal

严重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ch1]]

at java.util.concurrent.FutureTask.report(FutureTask.java:122)

at java.util.concurrent.FutureTask.get(FutureTask.java:192)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916)

at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:868)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

...

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> s/Login in servlet mapping

at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3150)

at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3125)

at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1372)

at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1176)

at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)

at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5120)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

... 6 more

注意关键错误提示：

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> s/Login in servlet mapping

原来是servlet配置错误

关联源码及说明文档：

1.下载相关源码(jar)

2.如果知道说明文档的在线地址可以不用下载，直接使用在线地址；如果不知道，下载说明文档（jar）

3.Eclipse操作

(1).选中工程中想要关联的包，右键build path：configure build path；或者project---》Java build path

(2).选择Libraries，这个时候，如果你是建的动态web工程，有两个地方，一个是直接能看到的你已经关联的包，一个是在web app libraries下也有同样的包

(3).源码关联两个地方随便你选择（两处都关联才能两处都嫩查看），不过为了方便，一般我们直接关联外面的包就可以了，但是说明文档必须关联在web app livraries下的包才能起作用

(4).打开对应包，下面有标签：Source attachment和Javadoc location，分别就是对应的源码关联和说明文档位置，选中，点击edit编辑；选择External location（源码）和

Java in archive的external file 的Archive path（上面的Javadoc URL 就是说明文档在线关联）