what is a runtime polymorphism? thanks a lot in advance

I have a singleton class that operates on a Tomcat server.  When I
start Tomcat, everything is fine, I have only one instance of the
class.  But, if I modify the web.xml file, per example, and the context
is stopped then restarted, the instance I had in the first place isn't

Help me! Help me!! Help me!!! Can any body no about "Service
descriptors". Where to use that and how???

midp 2.0
J2ME Wireless Toolkit 2.2
JDK 5
I get an NullPointerException when running the code (copy of code added

Any idea how to tinker with the java.policy file to prevent a
particular thread from being allowed to  be a member of the main thread
group?
Regards,

    Is there a 64-bit JVM for Windows 2003 Server 64-bit running on Intel
Xeon?  I can only find the 64-JVM for Windows running on the Intel
Itanium2 processor.  I have looked high and low for a
64-bit/Windows/Xeon JVM.  I'm really just looking for confirmation

I've written a servlet that takes an XML request and responds with a
forward to a JSP.
This will essentially produce an HTML output for the response.
My question is how I can preserve the context file paths for the HTML

In dist folder, NetBeans  creates a JAD and the JAR file.
What is the meaning of JAD?
Is it usefull?

I am looking into getting a good Intermediate/Advanced Java book.  I
have been programming for quite a while and do not really need to learn
programming basics, or how to use OOP.  It seems every other book is
learn in 21 days, .. for dummies, .. for the complete beginner.

can any body help me, how i can copy all files from one directory to
another in java. suppose i have a source directory called abc/def in
which i have 20 files. i want to copy all the files from this direcory
to xxx/yyy directory. can any body suggest me by code sample.

Does anyone know whether there is an HTML site somewhere
that looks the same as:
http://java.sun.com/j2se/1.4.2/docs/api/index.html
but has the javax.microedition.* classes and their methods

How everyone is working when it comes to designing gui?
My experience is the big part of reasons, but I often generate
small bugs related to GUI. For example, you have tree view
when clicking on the specific item you update some other gui

hai
i am getting run time excepton  Stack overflow exceptin in mai n thread
for below code
class a{

I've recently moved a web application running under Tomcat4.0.6, and
java 4.0.2 to JBoss4.0.3 and java 5.0. The application works fine under
Tomcat with java 4.0.2. However, I'm getting the exception
"java.lang.ClassNotFoundException:

When I go to http://myserver:8080, I get the Apache Jakarta Project
page which says it's the default Tomcat homepage.
I click on Tomcat Manager and I get prompted for a user name and
password.