| Multiple thread handle problem |
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Index ‹ java-programmer
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- 1
- Special characters: how to read them into JTable?Hello everybody,
I would like to read String data from a file into a JTable (using Vectors).
These data contain special characters,
mainly Greek symbols. Ideally, I would also like to display subscripts as
well, if possible.
Does anybody knows how this can be done?
Thanks in advance,
Maria
- 1
- File creation in the web applications' rootHello all.
Is it possible to get the path at which my application root is placed
by means of either the ServletContext or the ServletConfig object?
What I am trying to do here is to dynamically create a Javascript file
on the fly and put in the script directory of my web application. But
since the working directory in a web applications case is the
directory which contains the app servers' executable, any new file
created would be created there and I don't want to hard code the path
to my script folder. I want everything to be relative to the
applications' root as far as possible.
Can it be done without any special configuration, the way I can get a
resource present in the application root by the getResource() method?
Any kind of help would be greatly appreciated.
Regards,
sasuke.
- 1
- Eclipse path problem while opening file.When ever I try to read/open '.properties' (for that matter any file)
inside my project(for example I try to open system.properties file in
HelloWorld class) it cannot open/find it.
For example if I have a project called project1 which has java source
files in
src folder then and in any of the class files I cant open any of the
files inside the
src folder. No matter where I place the file that has to be read
(inside project1 or src
or build folder) it simply gives me java.io.FileNotFoundException
Instead if I give the complete path it works. How can I read the files
relative to
my project folder without giving the complete path?
It seems that when I run my application in looks in ECLIPSE_HOME/bin
folder, for the
file being read, which of course I don't want to happen.
I am using Eclipse 3.2 (WTP), Windows XP SP2 JDK 1.5.03
Any pointers how to fix this?
- 2
- avi to swf conversionhi
i have certain avi format files which i hav to convert in swf(flash
media files) to use in a webapplication.
can we convert it using java?
also suggest source code.
Regards
NK
- 3
- LISTEN UP EVERYBODY. put your programming skills to use in this new MMORPG game. details listedRun Online is a new MMORPG( massive multiplayer online role playing
game) in progress. I wish for it to be devoloped completley in java,
making it platform independent( able to run on any platform). The game
is set in medivial time(not finalized yet). When i firsted dreamed up
this project i had a huge case of amatures syndrome, as in the game was
so magnificently filled with a 1000nd classes, over a million monsters,
billions of monsters, and large world(I even had planned on putting in
25 other outer space planets)!!!!!! and all of these looked realistic.
Yep, thats the amatures syndrome. I got over it slowly as i realized
the difficulty in creating even the smallest of worlds. I couldnt
possibly even do that on my own, so i desided to put togheter this
dream team of specilists.
1 Project Manager: The project managers job is to over look the project
and organize the events and keep the project rolling.
.
Meeee!!!!
5 java programmers: the game is created completley in java. Im not sure
that 5 people is even enough, but that should do for now. Their job is
to program different segments of the game( each can focus on a
different aspect of the game to program)
.
.
.
.
.
3 graphic designers/ animation experts with basic knowledge of java:
their job is to create teh textures, buildings, and animations of the
world and the character as well as all the items and monsters.
.
.
1 database expert: manages the database part of the job.He/She must
make 100ds of reliable databases for usename, passwords. Items of a
character. Skills and many more. Its a key part of the game to get this
right.
.
1 Network administrator, security monitor: Must create an simple
encryption to code the graphics send over by the graphic people as
well as text written in the forum. This will prevent those outside of
"The Team" from getting into the game files and misusing it. The
network administrator part requires for knowledge in that field. This
person will the one responsible for having the game work smoothly on
the web, and sequerly.
.
3 Researchers/ advertisers: The reserchers must reserch and find
suitable programs, and information relating to the game of aspects of
the game. The advertisers will be responsible for advertising the game
to the public once it's finished. They will have to create cool
banners, and catchy phraces to help make drive the traffic to the game.
.
.
.
2 web designers: The web designers will design the website in which the
game will be hosted. The website must be trendy as well as easy to
navigate and quickly loadable.
.
.
2 Gamers/test players: They test out the game, find bugs, give
suggestions. They will be among the first in line to get a moderator
role.
.
.
If you would like to know more about any of these, or wish to join The
Project Team, plz email me at email***@***.com with your
qualifications and comments. You definetly have a good chance of
getting into the project if you sign up early. I will personaly read
all the applications and put my sincear thoughts into it.
Youc can also view the forum at http://runonline.aceboard.com
( it has no topics at the moment)
- 3
- list box values to be allignedhi,
my list box in the html page contains list box with values. these
values inturn have subvalues and I have to allign the child values to
right so that i can know the parent of the values. how can I do that.
list values should look something like this...
(suppose u have a list box with the state names in usa. the cities of
the states would be the child elements and the state names would be the
parent values)
ALABAMA
Abbeville
Huntsville
Birmingham
Montgomery
......
ALASKA
Anchorage
Tucson
.....
.......
........
........
Urgent can someone help pls. I can use java script or any java
technology
thanks..
- 6
- java web host - servlet jsp databaseHi everyone,
Could anyone recommend a good java web host? I need to run Servlet,
jsp and database. My budget is less than $20/Month
Thanks
John from CA
- 6
- Pls advice: Best OpenSource Java Framework/Portal for this requirements?Hi all,
I'm looking at different frameworks like JBoss Portal, GridSphere,
etc. but some opinion of any of you who has an experience with
frameworks would be helpful.
The most important requirement for the final system that will be
built on the framework is an easy way that the end-user can create his
own 'sub-portal' with predefined pages and an access to the predefined
'components' he can embed on those 'sub-portal' pages. Both - pages
(i.e. home, guestbook, history) and 'components' are predefined by the
system (portal, framework) but the user can fully customize their look
and feel even by replacing the default HTML code with his own.
The idea is similar to the way the blog platforms work: you can create
your own blog, once you do it, you get a list of predefined pages like
main, new comment, guest book, archive, etc.
The important thing is that you can completely change the HTML code of
those predefined pages within your blog.
You also get a set of 'components' or 'tags' like {blog}, {nick},
{guestbook}, etc. and you may embed them in your predefined pages
using HTML - as you wish. The content provided by these 'components'
is of course predefined by the blog platform so you can change only
look and feel of them.
So - which of the available opensource java-based frameworks/portals
could be the best to implement the functionality described above?
Thanks in advance for your opinions,
Tomasz
- 7
- Azureus ... forced to use Windows Version ...
The other day, I posted about download issues with Azureus ... today,
figuring to see if it was my network, or FreeBSD, I installed it on one of
my Windows boxes, and am currently downloading at ~85kb/s ;(
Please note that this Windows box is sitting *behind* the same FreeBSD box
that I'm lucky to get 1kb/s on ... the FreeBSD is the router ...
I don't know if this is a java issue, or freebsd issue ... but I really
don't have any ideas on how to debug why ...
Other then the machine its running on, I have Azureus setup the same,
including using java 1.5.0 ... but, of course, the version on the FreeBSD
is the new diablo binary ...
thoughts?
----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: email***@***.com Yahoo!: yscrappy ICQ: 7615664
- 8
- Java 5.0 released
http://news.com.com/New+Java+looks+to+shake+up+desktop/2100-1007_3-5389888.html
- 9
- Great time in FranceHello
I had a fantastic time in France, hope to visit again soon.
I found a holiday cottage from these guys www.looktogo.co.uk
Regards,
Dancer: ).
- 9
- date formathello
i am begining to working againt one postgresql database with java.
i must to put into the database some dates.
i must to configure the date fields into the database. which will be the
date format? timestamp?
if in java i have the String d="03/03/2003" how can i to format, convert,
this String to date timestamp?
which will be the idoneous field format for storing the dates and for
working with java?
Thanks
- 9
- 12
- JAI rotate problem (change of brightness)hi!
I'm developing small image processing software, I would like to rotate a
grayscale image.
I have a delcaration of the image inside class CMyImage:
public BufferedImage workImage;
int width, height;
Having source code:
public void process(CMyImage image, int angle)
{
float radiansAngle = (float)Math.toRadians(angle);
// rotation center
float centerX = (float)image.width / 2;
float centerY = (float)image.height / 2;
ParameterBlock pb = new ParameterBlock();
pb.addSource(image.workImage);
pb.add(centerX);
pb.add(centerY);
pb.add(radiansAngle);
pb.add(new javax.media.jai.InterpolationBicubic(10));
// create a new, rotated image
PlanarImage rotatedImage = JAI.create("rotate", pb);
// display the rotated image
...
}
image is rotated, I can see the result but... it has changed brightness!
when I rotate 0', 90', 180' or 360' - this problem doesn't occur, image
has the same intensity, but for other angles, like 1' image is just more
bright, histogram also shows this change.
what do you think about this problem? I'm not sure how rotation in JAI
is implemented - maybe this is just some problem of the ATI Radeon
driver? my system: WindowsXP, Eclipse 3.2... I can provide images if
it's required. Waiting for your help!
greetings, Marcin
- 13
- Connection's Close method, should it be called?Hi,
I am unsure whether it is good Java practise to use Close() to close a
database Connection.
EG:
dbConnection = DriverManager.getConnection(url, user, pass);
Statement sqlStatement = dbConnection.createStatement...
String sql = "SELECT ...
ResultSet results = sqlStatement.executeQuery(sql);
...do stuff with results...
Now that I've finished should I call close() or not?
dbConnection.close();
The API documentation makes it clear it will be closed automatically when
the garbage is collected -- but is it good practise to close it 'manually'
when you've finished with it?
Thanks,
MS
API Doc:
void close()
throws SQLException
Releases this Connection object's database and JDBC resources immediately
instead of waiting for them to be automatically released.
Calling the method close on a Connection object that is already closed is
a no-op.
Note: A Connection object is automatically closed when it is garbage
collected. Certain fatal errors also close a Connection object.
Throws: SQLException - if a database access error occurs
|
| Author |
Message |
ankur
|
 Posted: 2003-12-14 21:46:00 |
Top |
java-programmer, Multiple thread handle problem
hi
I am starting a no.of threads(500) from my application. i want to
start a new thread as soon as one of these threads dies.Any of the
thread could die at any particular time.Currently i am using a loop
to check which of the threads is alive and i can use join() for
others.I don't want to use a loop as that is eating a lot of memory.
Using synchronization method is it possible to block (creation of new
thread) untill one of the current thread dies.
Please help...
Anks
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HGA03630
|
| Posted: 2003-12-15 8:50:00 |
Top |
java-programmer >> Multiple thread handle problem
email***@***.com (anks) wrote in message news:<email***@***.com>...
> hi
>
> I am starting a no.of threads(500) from my application. i want to
> start a new thread as soon as one of these threads dies.Any of the
> thread could die at any particular time.Currently i am using a loop
> to check which of the threads is alive and i can use join() for
> others.I don't want to use a loop as that is eating a lot of memory.
>
> Using synchronization method is it possible to block (creation of new
> thread) untill one of the current thread dies.
>
> Please help...
>
> Anks
Don't create thread directly. Make a thread pool as a singleton and
let user who need new thread retrieve his thread from the pool.
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Index ‹ java-programmer |
- Next
- 1
- Calling own-constructors inside another constructorHi all,
Inspecting some pieces of code from someone I found things like this:
class A {
private String id = "";
public A() {
super();
}
public A(String id) {
this.id = id;
}
}
class B extends A {
public B() {
this(""); <-------------------- HERE!
}
public B(String id) {
super(id);
}
}
Inside constructor B() it's calling a constructor. Could this cause some collateral or strange problems?
I know it's nonsense because id attribute it's being initialized by default to "", but I'd like to know if
also is a problem.
- 2
- Release build in EclipseDoes anyone know how to make a lean release build with Eclipse,
binaries without debugging info ?
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- 4
- Problem with focus on JListHi!
I got 2 JLists . I doubleclick an item to display it's details.
This works fine so far, but:
When I select an item in JList1 and in JList2 the Mouselistener doesn't
know from which JList he should get the item.
So I had the idea that when you select an item in JList1 JList2 should
loose all selections.
But I just don't get it done.
any ideas?
- 5
- fixing image sizeI realise there have been several posting on this subject already.
However, despite these, I still can't quite work out how to do this.
I need to take the image from a file (.gif .jpg etc), ensure that the
entire image fits on a JPanel of some size, then put this JPanel onto
another Jpanel.
From what I could gather, it looked like I had to extend JPanel and
override paint(). The problem comes when I try to use drawImage().
Here's the code.
//relevent imports
public class Picture extends JPanel
{
private String fileName;
/** Creates a new instance of Picture */
public Picture(String file)
{
fileName=file;
}
public void paint(Graphics g)
{
super.paintComponent(g);
}
}
- 6
- Where Does the Code Go?I have a good programming practice question. Just for fun, Ive taken on a
side project that will help a teacher friend of mine work out grades. I
want a GUI interface that will store and retrieve grading info. So Im
hoping someonecan walk me through my class structure. My biggest question
regards whether or not it is good programming practice to have data objects
as members of my GUI class or if it should be done another way? I have my
main class which calls the GUI class. For now in my most basic skeleton, I
have a very simple student class, contains has a grade class. How should
these classes be arranged?
My first thought was have student a member of the GUI class. Say I have a
form with nothing more then two text fields for name and grade, and a
button. When I click the button, I want to store the the textfield data in
the student/grade classes. I can do that fine if student is a member of the
GUI class, but for some reason Im uncomfortable with this design. It seems
the GUI should be design only, no data access code in there. Eventually I
want to add database connection objects to this model for permanent student
data storage and would need to know where those would be called from as
well. So what do you guys think?
Classes:
Main
Gui
Student -> Grade
How to arrange?
Thanks
Rv5
- 7
- J2EE architecture questionHello.
Iv read a spec from a firm which wants to build a J2EE application,
but the application is not supposed to be web based. The reason for
this is mostly a very complex UI.
From what ive read about the J2EE architecture ,the presentation layer
has always been servlets or jsp.
Is it a posibility / option to build a J2EE application without the
web based presentation layer?
- 8
- help adding items to JComboBox on the flyAnyone happen to see what I might be doing wrong. I'm trying to add
items to my
JComboBox on the fly as nodes are added to the tree. It's like this ...
1. User adds tree nodes to a tree.
2. Then user can select on another node elsewhere in the tree which
renders a JComboBox
and the items just added from step 1 are listed in this box.
I have a few problems ...
- after I select my item in the combobox, the combobox stays there. If
I then select on another node, the item in the combobox doesn't get
selected. It doesn't work where I just select an item and it closes up
and that item is selected.
- sometimes I get a null pointer exception in action performed (because
getSelectedIndex() in getCellEditorValue() returns a -1) which seems to
get called while the program execution is still in the
getTreeCellEditorComponent. This confuses me. Why's it returning -1
when there are items in my combobox?
Any help much appreciated.
(I hope I've got my code snippet here w/o any typos, I had to cut it
down)
----
public class TreeEditor extends AbstractCellEditor implements
TreeCellEditor
{
private JComboBox myComboBox;
public TreeEditor() {
myComboBox = new JComboBox();
myComboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
TreePath path = jTree.getSelectionPath();
stopCellEditing();
Integer val = (Integer) getCellEditorValue();
myComboBox.setSelectedItem(val.intValue());
((MyUserObjectInfo)nodeInfo).setName(
myComboBox.getSelectedItem().toString());
node.setUserObject(((MyUserObjectInfo) nodeInfo));
jTree.getModel().valueForPathChanged(path, nodeInfo);
}
});
}
public Object getCellEditorValue() {
return new Integer(myComboBox.getSelectedIndex());
}
public Component getTreeCellEditorComponent(JTree tree,
Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
// find the children of this node that were recently added ...
TreeModel tModel = jTree.getModel();
Object root = tModel.getRoot();
DefaultMutableTreeNode carRoot = (DefaultMutableTreeNode)
tModel.getChild(root, 0);
String nodeName = null;
if (myComboBox.getItemCount() > 0) {
myComboBox.removeAllItems();
}
// add children of another node into this combobox.
for (Enumeration e = carRoot.children(); e.hasMoreElements();)
{
DefaultMutableTreeNode carNode =
(DefaultMutableTreeNode)e.nextElement();
Object nodeInfo = carNode.getUserObject();
nodeName = ((MyUserObjectInfo)nodeInfo).getName();
myComboBox.addItem(nodeName);
}
if (myComboBox.getItemCount() > 0) {
myComboBox.setSelectedIndex(0);
}
return myComboBox;
}
}
- 9
- stdout and stderr don't occur sequentially in Eclipse and NetbeansZelluX wrote:
> But System.err is unbuffered, so I don't think it will have any effect
> to flush after every write.
There is nothing in the Javadocs to indicate that System.err is unbuffered.
Like System.out, System.err is a java.io.PrintStream. The docs for
PrintStream imply that instances are buffered, else the flush() method would
be meaningless. So it is not accurate, or at least not safe to say that
System.err is unbuffered.
That leaves auto-flushing. Nothing in the Javadocs for System.err indicates
that it's created with autoFlush on. Did you check the source for your
particular flavor of Java to see if it is?
In my installation, the source shows:
setErr0(new PrintStream(new BufferedOutputStream(fdErr, 128), true));
Whaddaya know? System.err is buffered in my installation.
Sun Java JDK 1.6.0_10b25, 64 bit, Linux.
Are you quite certain that System.err is unbuffered in your Java installation?
--
Lew
- 10
- best struts-jsp-servlet development tool?Hello,
We are going to develop a web based application that uses Oracle 9i
database at the beckend. We started with Oracle JDeveloper 10g. It
seems fine but it fails to meet our needs at some points. Can you
recommend another tool for us?
Thanks in advance
- 11
- How to prevent the filechooser resolving symblic linksHello everybody
I am using a filechooser object to select files.
JFileChooser _fileChooser = new JFileChooser();
File[] selectedfiles = _fileChooser.getSelectedFiles();
for (int i =0 ; i < selectedfiles.length; i++) {
//path = selectedfiles[i].getCanonicalPath();
path = selectedfiles[i].getPath();
}
The _fileChooser.getSelectedFiles() returns already absolute path
names. So no matter if I call getPath or getCanocialPath I get the
abosolute path names.
But I want to display symbolic links as relative pathnames.
Is there a way to accomplish this?
Any help I will welcome.
Thanks in advance,
Zoran
- 12
- 13
- You don't know anything ...Hello John Bailo , You wrote ,
" I know when someone is bilking his customers
for c++ code whose functionality should be written in
OpenCalc macros "
You comment re-proves :
1 _ You don't know anything about
programming for the desktop .
2_ You don't know anything about my customers ,
even thought I've explained them to you
a million times .
- 14
- how to fire JTree child node eventI have a JTree where each node displays a specific view when selected.
I'd like to somehow fire an event to default the app which view to
display when opened.
How do I fire an event for a JTree as if the user clicked on a specific
child node?
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