Hi all,
You can disregard my message about Tomcat -- it's not a Tomcat
issue. It's a subtle serialization issue....
Thnaks
----- Original Message -----
From: "Tony LaPaso" <[EMAIL PROTECTED]>
To: "Tomcat User" <[EMAIL PROTECTED]>
Sent: Wednesday, July 17, 2002 7:53 PM
Subject: ??? Tomcat Bug? -- Throws NullPointerException ???
> Hello,
>
> I was hoping somebody could run this on a non-Tomcat server.
I've
> used TC v4.0.4 and v4.1.7 and both result in NPEs being thrown
> when I call getServletContext() from within the readObject()
> method of an inner class. Below is a very simple servlet that
> shows the problem.
>
> As you can see, the init() method is able to call
> getServletContext() with no problem. BUT, when init() tries to
> de-serialize an object which is an inner class, the object's
> readObject() method cannot call getServletContext().
>
> I'm not looking for "work-arounds" -- I just want to know if
this
> is a Tomcat bug.
>
>
>
>
>
>
> import java.io.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
>
> public class HelloWorld extends HttpServlet {
> public void doGet(HttpServletRequest request,
> HttpServletResponse response)
> throws ServletException, IOException {
> response.setContentType("text/html");
> PrintWriter out = response.getWriter();
>
out.write("<html><head><title>Hello</title></head><body>");
> out.println("Hello there....</body</html>");
> } // doGet()
>
> private class Inner implements Serializable {
> private Inner() {}
>
> private void readObject(ObjectInputStream ois)
> throws Exception {
> System.out.println("In Inner.readObject()...");
> ois.defaultReadObject();
> System.out.println("defaultReadObject completed...");
> ServletContext sc = getServletContext(); // BOOM!!
> System.out.println("Got the servlet context!!!");
> } // readObject()
> } // Inner
>
> public void init() {
> try {
> System.out.println("The servlet context is: " +
> getServletContext());
> ByteArrayOutputStream baos = new
> ByteArrayOutputStream();
> ObjectOutputStream oos = new ObjectOutputStream(baos);
> oos.writeObject(new Inner());
> oos.close();
>
> // Now, deserialize it....
> ObjectInputStream ois = new ObjectInputStream(new
> ByteArrayInputStream(baos.toByteArray()));
> Inner inner = (Inner)ois.readObject();
> System.out.println("Got the inner object...");
> } catch(IOException e) {
> System.err.println("Got an exception in init()..." +
e);
> e.printStackTrace();
> } catch(ClassNotFoundException e) {
> System.err.println("Got an exception in init()..." +
e);
> e.printStackTrace();
> }
> } // init()
> } // HelloWorld
>
>
>
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