I learn newly Java and Java3D programming and I have short questions
on it.
Because of this I search after fast help with it.
I hope to get help here.

Hello to all programmers out there.
I am currently developing a Java web application using Servlets / JSP.
I was just wondering how I would go about implementing complete commit
or complete rollback. For eg. I have a controller which depending on

I write a sample code to get some information via JVMTI, but error
JVMTI_ERROR_INVALID_ENVIRONMENT is always here.
HelloWorld.java,
class HelloWorld {

I encountered a problem not sure how to solve it. please help if
possible.
in oracle9 I do a simple encryption (using DES) that gives me the
following RAW:

I'm tryint to display the rows of a table usign JSF framework, but I
receive the following error
javax.faces.el.EvaluationException: javax.faces.FacesException:
javax.faces.FacesException: Can't instantiate class:

Why ?
Precisely I proceede as follows:
float e = 1.0f;
e -= 0.05f;

I would like to bind a JTextField with a String in such a way that an
update of JTextField content results in a modification of the String.
Actually it's no more no less than ui-model relation. I searched
around JTextField(Document) constructor, PlainDocument...

a basic question:
i have a memory consuming encoding process which runs in its own
thread.
To preseve OutOfMemory errors when a lot of those treads are running,

Does anyone have the source code for the RC2 algorithm written in
Java?
Thanks,
Marc

I've created a small application that allows the user to draw things
and put things on the screen (polygons, circles, arcs, etc.). Now I
want to implement an undo operation. The question is: does Java offer
any facility for this? Or there is any design pattern that I am

I came across a demo yesterday,which use System.out.println(cla) to
print a sentence on screen.But "cla" here is a class name.There is only
one method in this class definede as:public String toString().
Here is my question:If a mehod like "public String to String()" defined

Could someone explain why there is no destructor in Java classes?
There are many times you need to be called WHEN an object goes out of scope
and not when it will eventally be freed.

Is there any way to set the request focus of an object in a jsp page
dynamically when the page refreshed.
Let me explain more in detail. Assume a form having two text fields
txt1 and txt2. On first load of this form, the focus should be in

I have a method which takes a list of beans as parameter and does some
insertions into the database. I have something like this inside the
for loop:
for(int i=0;i<list.size();i++){

I'm declaring a constant object in my class definition, whose
constructor throws an exception. Note that the exception never actually
gets thrown - my argument ensures that.
Apparently, I can't use try-catch blocks outside a method, so I can't