eclipse+myeclipse 配置tomcat后,但无法启动？

Question

我是按这样网址http://www.delphibbs.com/keylife/iblog_show.asp?xid=4727一步一步做的，为什么不行的？

Answer 1

出现的错误信息是这样的：
Bootstrap: Class loader creation threw exception
java.lang.ExceptionInInitializerError
at org.apache.catalina.startup.ClassLoaderFactory.<clinit>(ClassLoaderFactory.java:63)
at org.apache.catalina.startup.Bootstrap.initClassLoaders(Bootstrap.java:103)
at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:196)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:402)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.apache.tomcat.util.compat.JdkCompat.<clinit>(JdkCompat.java:55)
... 4 more
Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 8 more
Caused by: java.lang.NullPointerException
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:374)
... 9 more
请指教！

Answer 2

还是提示：找不到org.apache.catalina.startup.ClassLoaderFactory的源
这是什么原因？