I am a newbie to hibernate and ORM concepts. I just want to make sure
whether my understanding is correct or not.
Consider a client-server scenario. I am mapping an object with a table
from the database at the server. So hibernate makes this object

I am looking to use the java.util.concurrent package in my application
because it provides exactly what I need to handle my threading.  Only
problem is that I cannot use the latest JDK (1.5).  Instead I am stuck
using 1.4.2_06.  I found out that the package is JSR-166, and found the

Anyone of you knows why executing a java program using
standard options and Xdebug option memory usage are different ?
For example, using this command to execute java (141):
java -Xmx${JAVA_MEM}m -Xms${JAVA_MEM}m -cp $CLASSPATH ${COMMAND}

I have an applet which takes XML document and with help of SAX it finds
values.
Structure of XML looks in shortcut like this:
< category >

Hi, there.
Many sources talk about setting/updating PATH, JAVA_HOME, CLASSPATH
environmental variables after JDK installation. PATH is easy to
understand. CLASSPATH is actually not recommended by SUN:

I think I have a fairly common problem, any advice would be greatly
helpful.
I have written a JApplet with NetBeans 4.1 (the entire program - only
about 50 lines - consists of only one class). When I click the START

I have created an applet using netbeans IDE.  When I run the project in
the IDE it does what it is supposed to do but when I open the HTML
page, the one the IDE created, I get nothing.  I see where the applet
should be but the content isn't there and there is no idication of an

I'm developing my first web application with Java technololgies. I have
a FrontController class (a Serverlet) that accept every request from
the browser. After checking the URI requested is right I use the method
request.getRequestDispatcher in this way

  from
http://www.onjava.com/pub/a/onjava/2002/10/02/javanio.html?page=4
Author said "The JVM thread-management machinery is designed to handle
a few tens of threads, not hundreds or thousands", true?

I'm trying to read a png image file, change some colors, and write it back
out to a file.
My code so far is below.  Can anyone tell me (specifically - details please)
how to write the modified pixels out to a new file or change the existing

I am looking for Java Base Ping Utility. Is Java support ICMP protocol.
Is there any API's provided for it?

I'm looking for a plugin in EClipse who can scan all of my pages
(.java, .jsp) and make a graph with the links between them
Thanks

I'm using JSP,Java and Javascript to code my web page. I am having a
form in the page. On clicking the submit button, the values are getting
inserted into the database. But the problem is, i can click the button
more than once. if i click it 5 times, the same data is getting

    So the idea is to use WeakReferences to objects.  When the GC
    decides to GC said objects, I'd like a thread to be notified
    via a ReferenceQueue that the objects are about to be GC'd.  The
    thread can then write them out to disk.  The upshot of all this

  socket.setReuseAddress(true); doesn't release the socket after
socket.close(). Why?
 Here is my testing code:
for (int i = 0; i < 10000; i++) {