More information:
The code I'm using to get the response code always comes back with http
status 200. The very next line:
ObjectInputStream result = new ObjectInputStream (in);
Is the one that generates the exception of EOF on stream.
Makes perfect sense... I just wish I had a reliable way of detecting at
the applet level when the session has expired...
On the server side I get an exception as it is attempting to send the
client the login form, but of course the applet is trying to send an
object and the server chokes:
-----------
Feb 16, 2006 8:35:47 AM org.apache.catalina.connector.CoyoteAdapter
service
SEVERE: An exception or error occurred in the container during the
request processing
java.lang.NullPointerException
at
org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:324)
at
org.apache.catalina.authenticator.FormAuthenticator.saveRequest(FormAuth
enticator.java:487)
at
org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAut
henticator.java:236)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticator
Base.java:490)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541
)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:105)
at
org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:
419)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:1
48)
--------
Any ideas are greatly appreciated.
Thanks.
-Dennis
-----Original Message-----
From: Klotz Jr, Dennis [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 16, 2006 8:29 AM
To: Tomcat Users List
Subject: Best practice for detecting session expiration for applets?
This might be off topic but I am hoping someone has the time to help me
out.
I recently moved from basic to forms based authentication and I am
having some problems with session expiration and my applets.
I serialize plain old java objects back and forth from my client applet
to tomcat 5.5.15 and now I am trying to recognize at the client when a
session has expired, instead of simply getting a nasty exception about
EOF on stream etc.
I'm hoping someone can give me a couple of pointers on what I should do
to handle this from an applet.
Should I do a 'normal' GET or POST heartbeat before the serialization
attempt? (really don't like this idea)?
Should I try and use HttpURLConnections getResponseCode()? (it doesn't
seem to work as I would expect).
Should I use the jakarata commons http client project? (Seems like
overkill)
Here is an example of the code followed by the exception I get on the
client side:
--------------------------
HttpURLConnection con = (HttpURLConnection)servlet.openConnection
();
Object o = null;
// Prepare for both input and output
con.setDoInput (true);
con.setDoOutput (true);
// Turn off caching
con.setUseCaches (false);
// Set the content type to be application/x-java-serialized-object
con.setRequestProperty ("Content-Type",
"application/x-java-serialized-object");
// Send headers
sendHeaders (con);
// Write the serialized object as post data
ObjectOutputStream out = new ObjectOutputStream (con.getOutputStream
());
out.writeObject (obj);
out.flush ();
out.close ();
InputStream in = con.getInputStream ();
int status = con.getResponseCode ();
System.out.println (this.getClass ().getName () + " : INFO : " +
status);
if ((status == con.HTTP_UNAUTHORIZED) ||
(status == con.HTTP_NOT_AUTHORITATIVE) ||
(status == con.HTTP_FORBIDDEN))
{
System.out.println (this.getClass ().getName () + " : WARNING :
Session timed out !!?? " );
// TODO: do something useful here. Send custom exception up...
}
ObjectInputStream result = new ObjectInputStream (in);
try
{
o = result.readObject ();
}
catch
... (snip) ...
finally
{
in.close();
result.close();
}
return (o);
-------------------------
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown
Source)
at
java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at
com.empirix.hm.callq.client.common.HttpMessage.sendPostMessage(HttpMessa
ge.java:212)
at
com.empirix.hm.callq.client.common.CallQSerializeData.sendViaHttp(CallQS
erializeData.java:102)
----------------------
Regards,
Dennis Klotz
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