Tomcat启动报 End event threw exception等异常，改怎么解决

Tomcat启动报 End event threw exception等错误，改如何解决？

我在一个工程的web.xml中加入如下初始化参数，启动Tomcat会报错，我用的Tomcat版本为Tomcat6.0.20

web.xml:（引起错误的代码，因为只有删掉这些代码才不会报错了，仅把其中<init-param>部分删掉也

能解决问题）；

XML code

  <servlet>
        <servlet-name>CreateDBServlet</servlet-name>
        <servlet-class>org.sunxin.cho4.servlet.CreateDBServlet</servlet-class>
        <init-param>  
            <param-name>driverClass</param-name>
            <param-value>com.mysql.jdbc.Driver</param-value>
        </init-param>
        <init-param>
            <param-name>url</param-name>
            <param-value>jdbc:mysql://localhost:3306</param-value>
        </init-param>
        <init-param>
            <param-name>user</param-name>
            <param-value>root</param-value>
        </init-param>
        <init-param>
            <param-name>password</param-name>
            <param-value>123</param-value>
        </init-param>
    
    </servlet>
    <servlet-mapping>
        <servlet-name>CreateDBServlet</servlet-name>
        <servlet-pattern>/CreateDB</servlet-pattern>
    </servlet-mapping>

Tomcat报的错误：

第一个错误；

2010-1-23 20:14:03 org.apache.tomcat.util.digester.Digester endElement

严重: End event threw exception

java.lang.reflect.InvocationTargetException

  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)

  at java.lang.reflect.Method.invoke(Method.java:597)

  at org.apache.tomcat.util.IntrospectionUtils.callMethodN(IntrospectionUt

ils.java:956)

  at org.apache.catalina.startup.CallMethodMultiRule.end(WebRuleSet.java:7

75)

  at org.apache.tomcat.util.digester.Rule.end(Rule.java:229)

  at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:114

0)

  at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endEleme

nt(AbstractSAXParser.java:601)

  at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp

l.scanEndElement(XMLDocumentFragmentScannerImpl.java:1774)

  at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp

l$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2930)

  at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(X

MLDocumentScannerImpl.java:648)

  at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp

l.scanDocument(XMLDocumentFragmentScannerImpl.java:510)

  at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X

ML11Configuration.java:807)

  at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X

ML11Configuration.java:737)

  at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.

java:107)

  at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Ab

stractSAXParser.java:1205)

  at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p

arse(SAXParserImpl.java:522)

  at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)

  at org.apache.catalina.startup.ContextConfig.applicationWebConfig(Contex

tConfig.java:365)

  at org.apache.catalina.startu