Hi Edward,

I believe the compiler error is due to the fact that it can't determine 
the
class of the errorfile object at compile time.

Try this syntax :
str=3D(String )(((PreReadError)errorfile).getTable("Error0"));

Cheers,

JeanLuc
-----Message d'origine-----
De?: Edward [mailto:zhangsc@n...]
Envoy=A8=A6?: mercredi 29 mai 2002 08:20
=A8=A4?: Java 2 Enterprise Edition
Objet?: [j2ee] How to create context in servlet?
Importance?: Haute


 
  I have a question about create context in servlet,I have a Hash 
table,I
want to place it into context of a servlet,so this Hash table can be 
called
by any users.My Hash table file named "PreReadError.java",it is 
follows:
 public class PreReadError
{
   public PreReadError()
  { 
     Hashtable table=3Dnew Hashtable();
      table.put("Error0","Error");
      table.put("Error1","Redirect");
  }

  public String getTable(String str)
 {
  String result=3D(String) table.get(str);
  return result;
 }
}


My servlet file named "GetUserIdentity.java" is follows:

import javax.servlet.ServletContext;
public class GetUserIdentity extends HttpServlet
{
  PreReadError readfile;
  String errorfile;
  String str;
  ServletContext context;

  public GetUserIdentity()
 {
    context=3DgetServletContext();
 }

 public void doPost(HttpServletRequest request,HttpServletResponse 
response)

     throws ServletException,IOException
 {
    //Here,I want to create a context if it is not exist,else call it's
method directly
    if(context.getAttribute("errorfile")=3D=3Dnull)
    {
       readfile=3Dnew PreReadError();
       context.setAttribute(errorfile,readfile);
    }
    str=3D(String )errorfile.getTable("Error0");
    System.out.println("Message is:"+str);
  }
 }      
}

When I compile it,it raise a error,it follows:

F:\login\ejb>javac -classpath .;f:\j2sdkee1.3.1\lib\j2ee.jar
GetUserIdentity.java

GetUserIdentity.java:55: cannot resolve symbol
symbol  : method getTable  (java.lang.String)
location: class java.lang.String
                        str=3D(String )errorfile.getTable("Error0");
                                              ^
1 error

I don't know how to put my Hashtable into a servlet and how to call 
it's
methods?
Any idea will be appreciated!
Thanks in advance.
Edward