java.lang.IllegalArgumentException错误，请指教

Question

总共三个文件：
ListServlet.java文件，tomcat\conf\Standalone\localhost\ch08.xml文件，E:\JSPLesson\ch08\WEB-INF\web.xml文件。
异常如下：
----------------------------------------------------------------------------------------------
严重: Parse error in application web.xml file at jndi:/localhost/ch08/WEB-INF/we
b.xml
java.lang.IllegalArgumentException: Can't convert argument: null
        at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.
java:2725)
        at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.
java:2751)
        at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:106
0)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source
)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(
Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
        at org.apache.catalina.startup.ContextConfig.applicationWebConfig(Contex
tConfig.java:351)
        at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:10
34)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfi
g.java:260)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:119)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
119)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:759)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:73
9)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.ja
va:608)
        at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.j
ava:535)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470
)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:310)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442
)
        at org.apache.catalina.core.StandardService.start(StandardService.java:4
50)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:709
)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
        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:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
2008-8-22 12:42:00 org.apache.catalina.startup.ContextConfig applicationWebConfi
g
严重: Occurred at line 55 column 19
2008-8-22 12:42:00 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2008-8-22 12:42:00 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2008-8-22 12:42:00 org.apache.catalina.core.StandardContext start
严重: Context [/ch08] startup failed due to previous errors
2008-8-22 12:42:00 org.apache.catalina.startup.HostConfig deployDescriptor
警告: A docBase D:\public\tomcat\webapps\fengye inside the host appBase has been
 specified, and will be ignored
Using properties file: D:\public\tomcat\webapps\fengye\WEB-INF/log4j.properties
Watch is set to: null
2008-8-22 12:42:01 org.apache.catalina.startup.HostConfig deployDescriptor
警告: A docBase D:\public\tomcat\webapps\manager inside the host appBase has bee
n specified, and will be ignored
2078 INFO  [cn.usa.manager.persistence.HibernateFilter] - Servlet filter init, n
ow opening/closing a Session for each request.
Using properties file: D:\public\tomcat\webapps\manager\WEB-INF/log4j.propertiesWatch is set to: null
2008-8-22 12:42:01 org.apache.catalina.startup.HostConfig deployWAR
信息: Deploying web application archive ch06.war
log4j:WARN No appenders could be found for logger (org.apache.commons.digester.D
igester.sax).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN No appenders could be found for logger (org.apache.commons.digester.D
igester.sax).
log4j:WARN Please initialize the log4j system properly.
5891 INFO  [cn.usa.manager.persistence.HibernateFilter] - Servlet filter init, n
ow opening/closing a Session for each request.
Using properties file: D:\public\tomcat\webapps\manager备份\WEB-INF/log4j.proper
ties
Watch is set to: null
log4j:WARN No appenders could be found for logger (org.apache.commons.digester.D
igester.sax).
log4j:WARN Please initialize the log4j system properly.
2008-8-22 12:42:07 org.apache.coyote.http11.Http11BaseProtocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2008-8-22 12:42:07 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:10009
2008-8-22 12:42:07 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/31  config=null
2008-8-22 12:42:07 org.apache.catalina.storeconfig.StoreLoader load
信息: Find registry server-registry.xml at classpath resource
2008-8-22 12:42:08 org.apache.catalina.startup.Catalina start
信息: Server startup in 9391 ms
--------------------------------------------------------------------------------------------

Answer 1

ListServlet.java源码如下：
------------------------------------------------------------------------------------------------
package org.sunxin.lesson.jsp.bookstore;import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;public class ListServlet extends HttpServlet{
private String url1;
private String user;
private String password;

public void init() throws ServletException{
ServletContext sc = getServletContext();
String driverClass = sc.getInitParameter("driverClass");
url1 = sc.getInitParameter("url1");
user = sc.getInitParameter("user");
password = sc.getInitParameter("password");

try{
Class.forName(driverClass);
}
catch(ClassNotFoundException ce){
throw new UnavailableException("加载数据库驱动失败！");
}
}
public void doGet(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
Connection conn= null;
Statement stmt = null;
ResultSet rs = null;
req.setCharacterEncoding("gbk");
String condition = req.getParameter("cond");

if(null == condition || condition.equals("")){
resp.sendRedirect("search.html");
return;
}
resp.setContentType("text/html;charset=gbk");
PrintWriter out = resp.getWriter();
try{
conn = DriverManager.getConnection(url1,user,password);
stmt = conn.createStatement();
if(condition.equals("all")){
rs = stmt.executeQuery("select * from bookinfo");
printBookInfo(out,rs);
out.close(); 
}
else if(condition.equals("precision")){
String title = req.getParameter("title");
String author = req.getParameter("author");
String bookconcern = req.getParameter("bookconcern");

if((null==title || title.equals(""))&&(null==author || author.equals(""))&&(null==bookconcern || bookconcern.equals(""))){
resp.sendRedirect("search.html");
return;
}
StringBuffer sb=new StringBuffer("select * from bookinfo where");
boolean bFlag = false;

if(!author.equals("")){
if(bFlag)
sb.append("and author = "+"'"+author+"'");
else{
sb.append("author="+"'"+author+"'");
bFlag = true;
}
}
if(!bookconcern.equals("")){
if(bFlag)
   sb.append("and bookconcern = "+"'"+bookconcern+"'");
else
   sb.append("bookconcern = "+"'"+bookconcern+"'");
}
else if(condition.equals("keyword")){
String keyword = req.getParameter("keyword");
if(null==keyword||keyword.equals("")){
resp.sendRedirect("search.html");
return;
}
String strSQL = "select * from bookinfo where title like '%"+keyword+"%'";

rs = stmt.executeQuery(strSQL);
printBookInfo(out,rs);
out.close();
}
else{
resp.sendRedirect("search.html");
return;
}
}
}
catch(SQLException se){
se.printStackTrace();
}
finally{
if(rs!=null){
try{
rs.close();
}
catch(SQLException se){
se.printStackTrace();
}
rs = null;
}
if(stmt!= null){
try{
stmt.close();
}
catch(SQLException se){
se.printStackTrace();
}
stmt = null;
}
if(conn!=null){
try{
conn.close();
}
catch(SQLException se){
se.printStackTrace();
}
conn = null;
}
}
}
public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
doGet(req,resp);
}
private void printBookInfo(PrintWriter out,ResultSet rs)throws SQLException{
out.println("<html><head>");
out.println("<title>图书信息</title>");
out.println("</head><body>");
out.println("<table border=1><caption>图书信息</caption>");
out.println("<tr><th>书名</th><th>作者</th><th>出版社</th><th>价格</th><th>发行日期</th>");
while(rs.next()){
out.println("<tr>");
out.println("<td>"+rs.getString("title")+"</td>");
out.println("<td>"+rs.getString("author"+"</td>"));
out.println("<td>"+rs.getString("bookconcern")+"</td>");
out.println("<td>"+rs.getDate("pbulish_date")+"</td>");
out.println("</tr>");
}
out.println("</table></body></html>");
}
}
---------------------------------------------------------------------------------------------------------------
web.xml源码如下：
------------------------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="gbk"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>SetCharacterEncodingFilter</filter-class>
</filter><filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping><servlet>
<servlet-name>CreateDBServlet</servlet-name>
<servlet-class>org.sunxin.lesson.jsp.bookstore.CreateDBServlet</servlet-class>
<init-param>
<param-name>driverClass</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</init-param>

<init-param>
<param-name>url1</param-name>
<param-value>jdbc:mysql://localhost:3306/mysql</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>root</param-value>
</init-param>
</servlet><servlet-mapping>
<servlet-name>CreateDBServlet</servlet-name>
<url-pattern>/createdb</url-pattern>
</servlet-mapping><servlet>
<servlet-name>ListServlet</servlet-name>
<servlet-class>org.sunxin.lesson.jsp.bookstore.ListServlet</servlet-class>
</servlet><servlet-mapping>
<servlet-name>ListServlet</servlet-name>
<servlet-pattern>/list</servlet-pattern>
</servlet-mapping></web-app>
-----------------------------------------------------------------------------------------------------------
ch08.xml源码如下：
-------------------------------------------------------------------------------------------------------
<Context path="/ch08" docBase="E:\JSPLesson\ch08" reloadable="true" />

Answer 2

把所有取值的语句如
String driverClass = sc.getInitParameter("driverClass"); 
url1 = sc.getInitParameter("url1"); 
改成
String driverClass = (String)sc.getInitParameter("driverClass"); 
url1 = (String)sc.getInitParameter("url1"); 

Answer 3

不行啊，我怀疑可能是web.xml或者ch08.xml配置文件的错误。

Answer 4

ListServlet.java文件编译能通过，就是运行Tomcat的时候报的如上错误

Answer 5

大哥 三个文件，我都是用UltraEdit写的，没用工具

Answer 6

<servlet-mapping> 
<servlet-name>ListServlet </servlet-name> 
<servlet-pattern>/list </servlet-pattern> 
</servlet-mapping> 

Answer 7

public class IllegalArgumentExceptionextends RuntimeException抛出的异 常表明向方法传递了一个不合法或不正确的参数。