I recently assisted in deploying applications that use Tomcat and
JBoss.  I am pretty new to all of this so I try to understand it all.
But one question I've been googling for already a long time while I did
not find a clear answer:  What is the purpose of EAR- and SAR files in

  I am using Sun's cacheRowSetImpl. When I try to serialize it, it
tells me that ResultSet is no serializable. I am using
populate(ResultSet, int) method to populate it.
The ResultSet is not stored as transient var, that is probably the

We have an application which keeps running in linux with DB2.
We found that in codes, if create and close preparestatement more than
like 800, then DB2 complains: DB2 SQL error: SQLCODE: -805, SQLSTATE:
51002, SQLERRMC: NULLID.SYSLH203 0X5359534C564C3031, etc.

Hey all,
I am writing a java program that is really a front-end to a handful of other
programs, each in a different location of a directory tree. Some of the
programs have data files that they look for w.r.t. their current directory.

I am using Eclipse profiler and have found that the following method,
getDate(), in a utility class was called more than 3000 times and cost 5
seconds of accumulative time.
public class Helper  //a utility class

I have just found this job recently. I really like my job and appreciate
my boss gave me the job offer, including a great salary. My main job is
to add some feature to an existing Java program, which is developed by
my boss in the past several years.

I am trying to render a page using the latest versions of
MyFaces/tomahawk. (1.1.4)
I had a question re a nested data structue. I have a structure that has
A list of categories, Each category may have items and subcategories,

I have a following doubts.
HTTP is based on TCP protocol.
But tcp is a stateful protocol then why HTTP is stateless?
Can't http inherit the statefulness property of tcp protocol?

I'm geting a strange error when I try and play a simple midi 1.0 file.
The file is definitely valid, and plays in every other midi enabled
application I have.
The error occurs when I try and realize() the player. After about 3

We are looking for a way to control the IP address we use for outgoing
HTTP requests so that we can choose between two IP addresses we will
have on a linux server.  We have a Linux server running Java/Tomcat
which is making HTTP GET requests to Web servers.  We want to be able

I've seen that in java the method is CellEditable of a JTable can be
overruled as follows:
       public boolean isCellEditable(int row, int column)
       {

hey everyone,
i'm looking for a pure java plugin for my Swing program which can do a
good job of rendering HTML and which has good support for JavaScript
and CSS.

I'm writing a program that needs a good mathematical expression parser.
I've found JEP, JEPLite, and Jbcparser. I'm still trying to figure out
what is the best one to use. Which note-worthy ones have I missed? It
seems that JEP has as of Nov 2006 closed its source. I'm concerned ...

How can I implement a non-blocking receive on a MulticastSocket object?
With socket objects it was simple:
                       socket = new Socket(hostIP, port);
                       in = new BufferedReader(new