Object streaming from applet to servlet - bad read from ajp13

[Wigzell, Cathy]

I'm running Catalina (TC4) as a servlet engine with IIS and I'm having
problems with object streaming. On the client side I have multiple threads
sending POST messages to the server, and on the server side I have a servlet
with a doPost catching the messages - all very standard. However, I often
get IOExceptions thrown on the client at out.close() and the message
'[Ajp13] bad read: -103' appears in the Catalina command window. I can't
find any information on the ajp bad read in the Tomcat documentation nor on
the web. The servlet doesn't implement SingleThreadModel so, theoretically,
a new servlet instance should be loaded for each doPost.

What is causing the bad read and why should out.close() throw an
IOException?

Many thanks for your help,
Cathy

Client:
private InputStream sendPostMessage(URL i_url) throws IOException
{
    URLConnection con = i_url.openConnection();

    // Prepare for both input and output
    con.setDoInput(true);
    con.setDoOutput(true);

    // Turn off caching
    con.setUseCaches(false);

    // Set the content type to be java-internal/classname
    con.setRequestProperty("Content-Type", "java-internal/" +
getClass().getName());

    // Write the serialized object as post data
    ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream());
    out.writeObject(this);
    out.flush();
    out.close();
        
    return con.getInputStream();
}

Server:
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
    ObjectInputStream in = new ObjectInputStream(request.getInputStream());
    ObjectOutputStream out = new
ObjectOutputStream(response.getOutputStream());
    MyObject obj = (APICall)in.readObject();
    // do stuff with obj
}

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