在eclipse中启动tomcat出错,单独启动tomcat能正常启动，程序也能跑起来，错误信息如下，有人遇到过这种错误嘛？
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:260)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:412)
Caused by: javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl could not be instantiated: java.lang.NullPointerException
at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:113)
at org.apache.tomcat.util.digester.Digester.getFactory(Digester.java:500)
at org.apache.tomcat.util.digester.Digester.getParser(Digester.java:705)
at org.apache.tomcat.util.digester.Digester.getXMLReader(Digester.java:979)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
at org.apache.catalina.startup.Catalina.load(Catalina.java:516)
at org.apache.catalina.startup.Catalina.load(Catalina.java:550)
... 6 more
[b]问题补充：[/b]
原本是好用的，变成这样是因为原来电脑里面要配同时能跑ASP和JAVA程序的服务，IIS和TOMCAT结果没配成功，把那些配置去掉后就在ECLIPSE里面启动TOMCAT就变成这样儿了
[b]问题补充：[/b]
不好意思，我没说明白，是要在外网服务器上配，两个都只能用80端口，所以在我本地找了个插件试，结果没试成功，我的eclipse还不好用了!-_-
