Why I can't open my file?

Thu, 23 May 2002 22:41:45 -0700 

  I have a question about open file at same directory.I have some files,like follows:
D:\Apache Tomcat 4.0\webapps\login\WEB-INF\classes\GetUserIdentity.class
D:\Apache Tomcat 4.0\webapps\login\WEB-INF\classes\error.txt
The role of GetUserIdentity.class is read data from the file "error.txt",The file 
"GetUserIdentity.java" like:
...
try
 {
   input=new BufferedReader(new FileReader("error.txt"));
   ...
  }
catch(IOException e)
  {
    e.printStackTrace();
   }

But when I start Apache Tomcat 4.0,and I visit index.html which locate 
http://localhost:8080/login/servlets/index.html

index.html is follows:
<html>
   <head>
       <title>Check Identity</title>
       <STYLE>.red {background-color:red;}</STYLE>
   </head>
   <body>
     <center>
     <br><br>
      <form action="http://localhost:8080/login/servlet/GetUserIdentity"; method="POST">
      <table align="center" width="%100" cellspacing="2" cellpadding="2">
        <tr>
           <td align="right">Input ID </td>
           <td><input type="Text" name="ID" align="left" size=15></td>
        </tr>
        <br><br><br>
        <tr>
          <td align="right">Input Password </td>
          <td><input type="password" name="password" align="left" size=15 
color="red"></td>
       </tr>
      </table>
      <br><br>
      <input type="Submit" name="okbutton"     value="      OK      " >
      <input type="button" name="cancelbutton" value="    Cancel    " 
onclick="window.close()">
      </form>
     </center>
    </body>
<html>

Then I click OK button,I got errors:

Starting service Tomcat-Standalone
Apache Tomcat/4.0.1
Starting service Tomcat-Apache
Apache Tomcat/4.0.1
java.io.FileNotFoundException: error.txt
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(Unknown Source)
        at java.io.FileReader.<init>(Unknown Source)
        at PreReadError.<init>(PreReadError.java:22)
        at GetUserIdentity.<init>(GetUserIdentity.java:20)
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Unknown Source)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:82
0)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.jav
a:615)
        at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServl
et.java:396)
        at org.apache.catalina.servlets.InvokerServlet.doPost(InvokerServlet.jav
a:216)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:243)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)

        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:201)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)

        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2344)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:164)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:170)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:170)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
462)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)

        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:163)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)

        at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso
r.java:1011)
        at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja
va:1106)
        at java.lang.Thread.run(Unknown Source)

I have put GetUserIdentity.class and error.txt in same dictionary,but why can't find 
it?
Any idea will be appreciated!
Edward

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