为什么我的tomcat一般情况下都可以启动,在eclipse里面也可以直接点击小猫的图象启动,但是如果是建立项目以后,在lomboz j2ee view里面,启动tomcat就会出现这样的错误! 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