| How to get you Extenal/Real IP (Router) |
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- 4
- sending raw data to a printer driverIn Windows I have some win32 code that I use in VC++ programs to send
raw data to the printer driver. I would like to do the same thing in
Java; does anyone know how to do this. Specifically, I need to send
printer codes or language commands to a printer. Specifically in the
case I am trying to write is to be a able to send command codes to an
Intermec barcode printer through a text file which has IPL (Intermec
Printer Language) code in it. It is just text, but it instructs the
printer what to do. Of course the printer code is not restricted to
just printer codes. If I could figure out how to send raw data to the
printer driver, this would help a lot.
Z.K.
- 5
- cannot call a paint function across classes?Just wondering if this is possible, as im having no luck working it out, no
matter what ive tried so far..
I have 2 classes, lets call them gP and kP. in gP ive got this function:
public void paint55(java.awt.Graphics graphics) {
Dimension d=getSize();
graphics.setColor(Color.RED);
graphics.fillRect(0, 0, (int)d.getWidth(), (int)d.getHeight());
graphics.setColor(Color.BLACK);
//call another function here
}
now, in the kP class, im using a jComboBox, the combo box works fine, but i
want to try and call that function from it
Ive tried
gP.paint55();
ive tried referencing it as gP paint55();
Just cant work it out, any ideas?
Thanks
- 5
- Refusing TCP connections - ServerSocketI want to create a ServerSocket.
I want it to accept one connection.
If another connection request comes in, I want it to be refused, not queued.
Even if I set backlog to 1, on the OS I'm testing on (Linux) I'm able to
queue up a bunch more connections (5 or 6).
I know the actual backlog size is OS dependent even if I explicitly set it
in the ServerSocket constructor.
So, how do I refuse all subsequent connections after I accept that first one?
--
Steve Sobol, Victorville, CA PGP:0xE3AE35ED www.SteveSobol.com
Geek-for-hire. Details: http://www.linkedin.com/in/stevesobol
- 7
- junit test in eclipse
code from some tutorial
---------
import junit.framework.TestCase;
public class SampleTest extends TestCase {
...
}
---------
code from another tutorial
---------
import org.junit.*;
import static org.junit.Assert.*;
public class SampleTest {
...
}
---------
Second one is working well. I think second one is simpler, so I like it.
But I can't use them with TestSuite.
"
The method addTest(Test) in the type TestSuite is not applicable for the
arguments
(Class<ArmorTypeWrapperTest>)
"
---------
import junit.framework.Test;
import junit.framework.TestSuite;
public class AllTests {
public static Test suite() {
TestSuite suite = new TestSuite("Test for vanguard.wardrobe");
//$JUnit-BEGIN$
suite.addTest(ArmorTypeTest.class);
suite.addTest(ArmorTypeWrapperTest.class);
//$JUnit-END$
return suite;
}
}
---------
Thank you
Sean
- 7
- OutOfMemoryError - Any Way to Exit JVM?Hi all,
We're having a major problem keeping Java calculators (that were
written by a third party vendor) alive. They leak memory and
eventually cause OutOfMemoryErrors. We cannot address the problem
directly until the vendor does, so we need to manage these dying
calculators.
Unfortunately, they are all started in separate processes and an
OutOfMemory error seems to kill *only* the thread, NOT the JVM. Is
there a way to ensure that the JVM dies as well?
My real hope is that some JVM has a command line option to kill the
whole thing when it has an allocation error. Otherwise, perhaps we can
add another thread to the process that watches it, but that's harder.
Any help would be greatly appreciated.
Thanks,
Steve Lieberman
- 10
- Any good GUI design/prototyper tools?I'm looking for a tool that will let me quickly design/prototype Swing
GUI layouts so I can get screenshots for review by end users. The
emphasis is on design, not building as such - I'm not interested in
*using* any generated code at this stage, although the tool needs to
be able to save and load layouts, and preview the layouts.
What is really required is something that works like a drawing program
but with Swing components. Ideally it would:
o Allow absolute positioning and sizing, because at this stage I'm
essentially doing graphic design and don't want to be worrying about
implementation of layout managers
o Allow easy moving and alignment of elements or groups of elements
o Have a Property Editor, but with configuration of defaults so that I
don't have to, for example, change the font on every element.
o Have a quick build/preview so I can get screenshots easily.
I have looked at a few IDEs and GUI builder tools, but so far nothing
seems really orientated towards making this particular task quick and
easy. Does anyone know of anything that's appropriate... or should I
be thinking about coding something myself?
- 11
- Finding path of running classFile currentDir = new File(System.getProperty("user.dir"));
I need to know the path to a class that is running and have had
partial success. The code shown above finds the folder where the JVM
is running.
If I start my app from a terminal window or a native executable IDE,
the JVM will run in the folder where my class is located and
currentDir points to the folder that I need. But if I start the app
from an IDE written in Java, I get the folder where the IDE is located
rather than the folder where the app that I was running is located.
My app will be used in a classroom setting by people who will NOT have
command prompt permissions. They will have to run it from an IDE.
I'd really like to stick with the one that we're currently using
(written in Java).
Apparently, both the IDE and my application are running in the same
JVM. Is there any way to get the application to run in its own JVM so
user.dir points to that folder?
If not, any other suggestions?
TIA
tom
- 11
- 11
- Positioning scrollable dataI have pasted a bare bones program below which demonstrates the
problem I am trying to solve.
I have a JTextArea on a JScrollPane, and the number of lines to be
displayed exceeds the display area. Thus scrolling is activated, and
the starting screen shows from line 1 onwards with the scrollbars
available for scrolling. So far so good.
Now I want to redisplay another screen. Once again the number of lines
exceeds the display area, This time around though, the END of the
lines are displayed. Instead of (for instance) lines 1 to 10 of 100
lines being displayed, lines 90 to 100 are being displayed.
I don't want this. Each time I want to data on the JTextArea to be
displayed from line 1 onwards.
Some research that I did indicated that getViewport().setViewPosition
would be my friend. However, as you can see in the code below, I DID
code this, but it would not work.
Does anybody have an idea how to change the code below so that I can
get the display that I want?
Thanks!
/*
* Example code to demonstrate the problem:
* The first time the data in the JTextArea is displayed,
* the data is positioned at the first line.
* Subsequently (after clicking the Next button), the data
* is positioned such that the last line is displayed.
* I want to reposition the data in the JTextArea such
* that each time after a refresh, the first line of the data
* should be displayed.
***********************************************/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Example extends JFrame implements ActionListener
{
JTextArea textArea;
JScrollPane js;
JButton nextButton = new JButton( "Next" );
JButton endButton = new JButton( "End" );
int counter = -1;
Example()
{
setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
textArea = new JTextArea( 15, 50);
textArea.append( " " );
js = new JScrollPane( textArea );
nextButton.addActionListener( this );
endButton.addActionListener( this );
JPanel pane = new JPanel();
pane.setLayout( new FlowLayout() );
pane.add( nextButton );
pane.add( endButton);
pane.add( js );
setContentPane( pane );
setLines();
setTitle("Example");
setSize(600,400);
setVisible(true);
} //end constructor
public void actionPerformed( ActionEvent evt )
{
Object source = evt.getSource();
if( source == nextButton )
{
setLines();
}
else if( source == endButton )
{
System.exit(0);
}
repaint();
}
void setLines()
{
textArea.setText( "" );
counter++;
for( int n=0; n<100; n++ )
{
textArea.append( counter + " " + n + "This line is filler
data to demonstrate problem\n" );
}
// Attempt to position to top of data... but it does not work :(
js.getViewport().setViewPosition( new Point( 0,0 ) );
}
public static void main( String[] args )
{
new Example();
}
}
- 13
- java.lang.NoClassDefFoundError when calling method from EJBI have a java app that runs on Websphere 6.0 and I needed a way to run
a scheduled task once a day that sends out emails. I used the
following link from IBM's site to develop a stateless EJB session bean
that ran the WAS task scheduler.
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic=/com.ibm.websphere.zseries.doc/info/zseries/scheduler/tasks/tsch_schedulebtask.html
I placed a call in the implemented process method (just like the
example says) to a non-EJB method and I get a
java.lang.NoClassDefFoundError error on the method I am tryign to call.
I'm new to EJB so I'm not sure if you can even make a call from an EJB
to a normal (non-EJB) method. Any help would be appreciated.
- 14
- How to determine the PID of your Java programHi
I was unable to find a decent How-To for finding the PID of a Java
program running on Windows, that did not use JNI. Here is a solution
that uses netstat.
Hope this is useful. If you have a better strategy, let me know!
Thanks
Andrew
package pid;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.SocketTimeoutException;
/**
* Program to obtain the Process Identifier (PID) of the running Java
program
* Assumes the Windows program
* @author Andrew Ward
*/
public class GetPID {
public static void main(String[] args) {
getPid();
}
/**
* Obtain the PID, by listening on a port, then using netstat -ano
* to find the PID of the processing listening on the port
* @return the pid of this process
*/
public static int getPid() {
// Select a port between 50000 and 51000
final int port = 50000 + (int) (Math.round(Math.random() * 1000));
// Windows specific command line
// Netstat -ano will return many lines, one of which will match
// TCP 0.0.0.0:<port> 0.0.0.0:0 LISTENING
<pid>
final String cmd = "netstat -ano";
final String criteria = "0.0.0.0:" + port;
// Listen on the port for 5 seconds
new SocketListener(port, 5 * 1000).start();
int pid = -1;
try {
// Run netstat
Process process = Runtime.getRuntime().exec(cmd);
InputStream istr = process.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(istr));
String str;
while ((str = br.readLine()) != null) {
if (str.indexOf(criteria) > 0) {
String match = str.substring(1+str.lastIndexOf(" "));
pid = Integer.valueOf(match);
System.out.println("PID: " + pid + " {" + str + "}");
}
}
} catch (Exception e) {
e.printStackTrace(System.err);
}
return pid;
}
/** listen on a socket */
public static class SocketListener extends Thread {
int port;
int wait;
public SocketListener(int port, int wait) {
this.port = port;
this.wait = wait;
}
public void run() {
try {
ServerSocket server = new ServerSocket(this.port);
server.setSoTimeout(this.wait);
server.accept();
server.close();
}
catch(SocketTimeoutException e)
{
// We are expecting the accept() call to timeout
// so ignore this exception
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
}
}
- 14
- JBoss e eccezioni...Ciao a tutti, ho un problema con JBoss! Ogni volta che entra in errore
la mia applicazione, JBoss s'impalla e rimango in pending 10 minuti
prima che mi lanci fuori un eccezione. Avete idea se ci sono variabili
da settare perch?non rimanga cos?tanto in attesa? Grazie.
- 15
- How to add a button next to title at the JTabbedPaneHi,
I want to add a small button next to the title of each tabbed pane and
receive user's mouse click event at the small button.
And finally, the selected pane will be removed.
How to add other object, button, into Title part of JTabbedPane ?
Any ideas?
- 15
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| Author |
Message |
Homer
|
 Posted: 2006-4-18 2:37:00 |
Top |
java-programmer, How to get you Extenal/Real IP (Router)
Hi All,
I am writing a code as a Java Application (not Applet or Servlet) and I
am trying to find out what is my real IP address (not 192.168. one). I
am behind my LinkSys router and everything I try I still get 192.168.
I have tried:
- InetAddress: Always returns 192.168 address (unless I am missing
something).
- Open Socket to www.cnn.com,80 and read local address (still 192.168).
- I am reading about Upnp but not sure if that's the way I can ask my
Router about my real IP.
- Calling http://www.whatismyip.com and parse the result seems too
strange.
Any idea?
Thanks in advance,
Homer
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Thomas Hawtin
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| Posted: 2006-4-18 1:59:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
Homer wrote:
>
> I am writing a code as a Java Application (not Applet or Servlet) and I
> am trying to find out what is my real IP address (not 192.168. one). I
> am behind my LinkSys router and everything I try I still get 192.168.
The 192.168.. address is the real IP address of your machine. To get the
IP address of the other side of your NAT router will be router
dependent. For my D-Link router, I'd have to login to the administration
pages and find the IP address amongst the JavaScript.
Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/
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James McGill
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| Posted: 2006-4-18 2:52:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
On Mon, 2006-04-17 at 11:36 -0700, Homer wrote:
>
> - Calling http://www.whatismyip.com and parse the result seems too
> strange.
You can't do it reliably without querying some service that can see the
remote address of the connection, and that means something outside your
gateway. That's why webservices like that are needed, otherwise the
browser would be able to give you the info.
Why do you need the "real" address? If it's not something you can put
in DNS (and reverse DNS), how do you know it won't change between calls
to your function?
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Philipp Leitner
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| Posted: 2006-4-18 3:36:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
> - Calling http://www.whatismyip.com and parse the result seems too
> strange.
Why's that so bad? Using a Web Service seems to be a good way to solve
your problem - just make sure that you can exchange the service easily
if it is removed for one reason or another.
/philipp
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Martin Gregorie
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| Posted: 2006-4-18 3:45:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
Homer wrote:
> Hi All,
>
> I am writing a code as a Java Application (not Applet or Servlet) and I
> am trying to find out what is my real IP address (not 192.168. one). I
> am behind my LinkSys router and everything I try I still get 192.168.
>
Visit grc.com or crypto.yashy.com/nmap.php - both are web sites and will
report your firewall's external IP.
--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |
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Homer
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| Posted: 2006-4-18 3:57:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
To answer to question "why do I need external IP address?":
I have a website hosted somewhere for a little bit of money. The
problem is that hosting company doesn't support PHP, MySql,.... (that
I need for my FamilyTree software)
I have DSL connection as home and I put some small html pages on
hosting site to forward all Not-Supported requests to my home web
server.
Inside those small-html-files I have my dynamic home ip address and I
need to change it whenever my ip address changes.
Now I wrote some code (working great): It runs as service
(wrapper.tanukisoftware.org) and checks my external IP address every 5
second (I am sending httpRequest to http://www.whatismyip.com and parse
the response until I find a better solution). Then it pulls (ftp) my
html files from hosting site, put the new IP and push them back into
the site.
I know that it looks a bit ugly, but it's free and it's working
(with up to 5 sec delay).
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Oliver Wong
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| Posted: 2006-4-18 4:00:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
"Homer" <email***@***.com> wrote in message
news:email***@***.com...
> To answer to question "why do I need external IP address?":
>
> I have a website hosted somewhere for a little bit of money. The
> problem is that hosting company doesn't support PHP, MySql,.... (that
> I need for my FamilyTree software)
> I have DSL connection as home and I put some small html pages on
> hosting site to forward all Not-Supported requests to my home web
> server.
> Inside those small-html-files I have my dynamic home ip address and I
> need to change it whenever my ip address changes.
>
> Now I wrote some code (working great): It runs as service
> (wrapper.tanukisoftware.org) and checks my external IP address every 5
> second (I am sending httpRequest to http://www.whatismyip.com and parse
> the response until I find a better solution). Then it pulls (ftp) my
> html files from hosting site, put the new IP and push them back into
> the site.
>
> I know that it looks a bit ugly, but it's free and it's working
> (with up to 5 sec delay).
>
Have you considered using a service like no-ip.com?
- Oliver
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Homer
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| Posted: 2006-4-18 4:27:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
Nope. I know it's cheap but is not free.
And my code is working. I just want to make it better. I can even put
some code in my Hosting server to return my IP address instead of using
whatismyip.com.
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Oliver Wong
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| Posted: 2006-4-18 5:14:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
"Homer" <email***@***.com> wrote in message
news:email***@***.com...
> Nope. I know it's cheap but is not free.
> And my code is working. I just want to make it better. I can even put
> some code in my Hosting server to return my IP address instead of using
> whatismyip.com.
no-ip.com provides different services. The so called "Free" service is
free. See http://www.no-ip.com/services/managed_dns/free_dynamic_dns.html
On the other hand, the "Free" service is intended for "personal use
only". Not sure how that fits in with your site (which I believe you
mentioned makes a bit of money). You might want to read the contract
carefully to see what is or isn't allowed.
I used to use the free service, but eventually I just bought a domain
name and a static IP.
- Oliver
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Alex Hunsley
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| Posted: 2006-4-18 6:55:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
Homer wrote:
> Nope. I know it's cheap but is not free.
No-ip.com is free, I've been using it at work for ages and it's still free.
Also dyndns.org is free. I actually recommend dyndns.org, because they
provide you with a free download called noipDuc (or similar) that runs
on your machine and updates their DNS servers whenever your external IP
changes.
Also, my wireless router (Linksys WRT54G) has a feature in the admin web
pages to allow auto updating of your dyndns address, so I don't even
have to run noipDuc on my desktop machine any more.
> And my code is working. I just want to make it better. I can even put
> some code in my Hosting server to return my IP address instead of using
> whatismyip.com.
I'd seriously avoid doing this in your own code - I appreciate it works,
but it seems inelegant, when dyndns.org works so well and is free.
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Amfur Kilnem
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| Posted: 2006-4-18 7:17:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
"Homer" <email***@***.com> wrote in message
news:email***@***.com...
> Nope. I know it's cheap but is not free.
> And my code is working. I just want to make it better. I can even put
> some code in my Hosting server to return my IP address instead of using
> whatismyip.com.
>
I have created another solution that works pretty well, and it is entirely
self-contained (ie, no third-party software or fees).
I have a small program running on my home server (Sun Netra). It's actually
two threads: one is a mini-server, which listens on a local port; the other
will access that port every few minutes, at my last known IP address, asking
for a magic number. If the magic number is wrong, or there's no response
from the mini-server, then the IP must have changed, so the program will
then access a CGI script on my remote (paid-for) website. That CGI script
will extract my home IP from the request header, and save it to a file. It
will also return the IP address back to my home server, where it will be
saved to my "last known IP" file. So now my home IP is saved at both ends.
It gets better. I have another CGI script on my remote web-site, which acts
as another mini-server. When this one is accessed, it will open a
connection to my home server (it has the IP address, remember!), and will
pass the query portion of the request to the home server, where it will be
passed to Tomcat, which creates HTML from a mixture of JSP and Servlets.
And because the home server also knows the home IP, it can plug that IP
address into the newly-created pages. What this means in practice is that I
can create content which contains references to images (for example) that
are on my home machine. The address bar in the browser still points at my
remote website, while some (or all) of the content is here at home. And
even if my IP changes, the generated pages will always contain the correct
IP.
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Roedy Green
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| Posted: 2006-4-18 7:24:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
On Mon, 17 Apr 2006 18:59:22 +0100, Thomas Hawtin
<email***@***.com> wrote, quoted or indirectly quoted someone
who said :
> IP address of the other side of your NAT router will be router
>dependent.
I call that the FACE IP. To determine it, see
http://mindprod.com/jgloss/ip.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
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Roedy Green
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| Posted: 2006-4-18 7:24:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
On Mon, 17 Apr 2006 21:13:38 GMT, "Oliver Wong" <email***@***.com>
wrote, quoted or indirectly quoted someone who said :
> On the other hand, the "Free" service is intended for "personal use
>only". Not sure how that fits in with your site (which I believe you
>mentioned makes a bit of money). You might want to read the contract
>carefully to see what is or isn't allowed.
there are a number of other such services. Check them out via
http://mindprod.com/jgloss/dyndns.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
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David Segall
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| Posted: 2006-4-18 14:33:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
"Homer" <email***@***.com> wrote:
>Now I wrote some code (working great): It runs as service
>(wrapper.tanukisoftware.org) and checks my external IP address every 5
>second (I am sending httpRequest to http://www.whatismyip.com and parse
>the response until I find a better solution). Then it pulls (ftp) my
>html files from hosting site, put the new IP and push them back into
>the site.
I like it! I do it the other way round by using my Dlink 624-S to
monitor the IP address and let ZoneEdit know if it changes. That part
is free but I pay an insignificant $11.00/year to have ZoneEdit
monitor my web site and switch over to my free ISP site if my server
is unreachable. I think your method is better because I could direct
all the plain HTML requests to my ISP making them faster and more
reliable and only redirect the stuff I cannot host there.
Would you mind sharing your code? If that's OK, perhaps you could send
it to david at segall dot net. The "Reply To" address is invalid.
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Homer
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| Posted: 2006-4-18 20:42:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
Very cool. nice work (what do you think about my solution?).
I beleive those free services (like noip, dynip,..) are a bit slow
since it will take some time to update DNS servers everywhere.
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Homer
|
| Posted: 2006-4-18 20:55:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
BTW. I can use this to return my IP: (just save it to something.cgi and
call it)
#!/usr/bin/perl
use warnings;
use strict;
use CGI qw/:standard/;
my $remote_ip = $ENV{'REMOTE_ADDR'};
print header;
print "Your IP is: $remote_ip\n";
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Homer
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| Posted: 2006-4-18 22:03:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
As an update: I put a small thread inside my code (I didn't want to run
another code) to listen to some port (socket accept) and also I added a
open socket line to my code (as a client). So I am checking everything
inside one peace of code. Everything is cool now. Thanks to Amfur for
his idea.
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Amfur Kilnem
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| Posted: 2006-4-18 22:06:00 |
Top |
java-programmer >> How to get you Extenal/Real IP (Router)
"Homer" <email***@***.com> wrote in message
news:email***@***.com...
> Very cool. nice work (what do you think about my solution?).
I had tried the same thing, but accessing my remote server every few seconds
was generating huge log files.
My method generates no log files, and no internet traffic, until the IP
changes.
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Index ‹ java-programmer |
- Next
- 1
- JTextArea.setLineWrap(true); not working properly with JSplitPane ??Hi,
I have a very strange behavior ...
Placing a JTextArea which is set to: setLineWrap(true); in a JPanel and
the JPanel in a JSplitPane causes the JSplitPane to get stuck (it can't
be moved ...).
It happens with all the layouts that I've tried: BorderLayout,
BoxLayout, with the GridBagLayout it happens when setting the
GridBagConstraints.fill to GridBagConstraints.HORIZONTAL or
GridBagConstraints.BOTH (it doesn't happen when setting it to
GridBagConstraints.NONE or GridBagConstraints.VERTICAL).
However, placing the JTextArea in a JScrollPane works fine (but it's
not a good solution for me).
Does anyone have any idea why it happens and how it can be solved?
Thanks.
- 2
- 3
- Using firePropertyChangeIf I have x number of properties, all of which have public getters and
setters methods, is it a good idea to have a
firePropertyChange(fieldName, oldValue, newValue) method inside those
individual setters?
I understand that it only applies to "bound property". What constitute
a "bound"?
- 4
- close() of active socket does not work on FreeBSD 6On Wednesday 13 December 2006 04:49, Daniel Eischen wrote:
> On Tue, 12 Dec 2006, Poul-Henning Kamp wrote:
> > In message <email***@***.com>, Bruce Evans writes:
> >> On Mon, 11 Dec 2006, Daniel Eischen wrote:
> >>
> >> It's probably a nightmare in the kernel too. close() starts looking
> >> like revoke(), and revoke() has large problems and bugs in this area.
> >
> > There is the distinctive difference that revoke() operates on a name
> > and close() on a filedescriptor, but otherwise I agree.
>
> Well, if threads waiting on IO are interruptable by signals,
> can't we make a new signal that's only used by the kernel
> and send it to all threads waiting on IO for that descriptor?
> When it gets out to actually setup the signal handler, it
> just resumes like it is returning from an SA_RESTART signal
> handler (which according to another posting would reissue
> the IO command and get EBADF).
Stop using signal, it is slow for threaded process, first you don't
know which threads are using the descriptor, second, you have
to run long code path in kernel signal code to find and deliver
the signals to all interested threads, that is too expensive for
benchmark like apache benchmark.
David Xu
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To unsubscribe, send any mail to "email***@***.com"
- 5
- toString() or Renderer(s) for BizObjects shown in GUI ComponentsHi There,
What do people prefer for populating GUI Components (Swing) with
Business Objects ?
overriding the toString() method of those Business Objects ? or
creating renderers for each type of component ? (or something else ?)
overriding the toString() method seems easiest, and seems to work --
even seems like thats how the Swing designers intended it (since
components like JComboBox, JList, etc take Objects to populate the
model),
but of course - it may be that in one instance you want your Person
BusinessObject to show up as LastName, FirstName, and in another
component you want to see FirstName, LastName - so a single toString()
method won't cut it.
using renderers instead of toString seems to work too -- but means
potentially writing renderers for almost every component and business
object combination (assuming no use of the toString() method on the
business objects).
Does anybody have any thoughts on this ? a better approach ?
Many Thanks
T
- 6
- Struts: How do I validate data from an edit form?Hello!
In my Struts app - after submit - I want to validate fields that were
filled with values from a database beforehand. To fill the fields with
the old values I write the existing data into a bean and use it in my
JSP as follows:
<jsp:useBean id="formData" scope="request" class="com.xyz"/>
<html:text name="formData" property="test"/>
So far so good.
When a validation error occurs the user is redirected to the same JSP.
The problem now is that the fields are empty because the bean defined
in the JSP doesn't exist anymore. In fact I actually don't want this
bean to be used. The form-bean which is containing the new data should
be used.
How can I acchieve that?
Regards,
Stefan
- 7
- doubts regarding j2meI am new in j2me...I have some doubts...
1. How to insert an image into a servlet?
2. How to access it from a mobile using j2me?
3. How to send an image file from a mobile to a servlet?
Please help me...
- 8
- Bug#297574: upstream test case
Similar problem (jar to native compilation) reported in
http://gcc.gnu.org/PR18931
(closed)
the _exact_ bug is reported in
http://gcc.gnu.org/PR19505
(open)
test case PR19505.class still fails with gcj-snapshot (20050227)
GNU Java version 4.1.0 20050227 (experimental) (i486-linux-gnu)
compiled by GNU C version 4.1.0 20050227 (experimental).
GGC heuristics: --param ggc-min-expand=47 --param ggc-min-heapsize=32066
...
Note comment #2 on http://gcc.gnu.org/PR19505 : gcj fails to compile
bytecode produced by Sun's javac, but not when compiling bytecode
produced by gcj (with -C) or ecj.
comment #2 is posted in 2005-01-25 (same as the failing gcj I am
using), but I am compiling a .jar produced by gcj (I guess bug was
introduced some time between 2004-12-28 and 2005-01-25)
I am testing again:
gcj-snapshot -O2 -Wl,-Bsymbolic -shared -fPIC -fjni -findirect-dispatch -o /tmp/jdt.jar.so /usr/share/eclipse/plugins/org.eclipse.jdt.ui_3.0.1/jdt.jar
now. It take long time, but problem with gcj 4.0 20050125 happen soon,
I still do not see problem, by now. The jar is compiled with gcj 4.0
20050125
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- 9
- Potentially dumb questionCould anyone tell me where I might download the latest version of the
Java Development Kit? I have an old Java book and I thought I might
play with it but I need a kit that works with Win XP.
TIA
-Lex
- 10
- Bug#305847: ITP: libservlet2.4-java -- Servlet 2.4 and JSP 2.0 Java classes and documentationPackage: wnpp
Severity: wishlist
* Package name : libservlet2.4-java
Version : 2.4
Upstream Author : Apache Jakarta Group
* URL or Web page : http://jakarta.apache.org/tomcat/index.html
* License : Apache 2.0
Description : Servlet 2.4 and JSP 2.0 Java classes and documentation
For more information about Java servlets please take a look at the Tomcat
home page at http://jakarta.apache.org/tomcat/index.html.
.
The official Servlet 2.4 and JSP 2.0 specifications can be found at
http://java.sun.com/products/servlet/ and http://java.sun.com/products/jsp/.
This is a split of tomcat5 source package (this one will be package later)
--
Arnaud Vandyck
Java Trap: http://www.gnu.org/philosophy/java-trap.html
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with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 11
- customize JScrollBarHello,
I want to scroll up/down by pressing buttons
other than the standards of JScrollBar(These
simple up und down arrows).
Is it possible?
- 12
- java dont have #includes, it sucks !!!http://java.sun.com/docs/books/tutorial/java/concepts/class.html
how can i link diferent modules in one single .class in that lousy
object-wacko language ??? java sucks !!!!!
hahahahahahahahahahahahahahahahaha
either have pointers or #defines !!!! its a C abortion !!!! who
cares ???
C RUUUUUUUULEEEEEZZZZZZZZZ DAMMIT !!!!
- 13
- IllegalStateException...Writer being already used by this servletHi All,
I am faceing a problem (ofcourse thats what makes all of us come
here)..what I am trying to do is , create a image offscreen in a
servlet , then using PixelGrabber serialize the int[] and then the
applet reads it, ..so far fairly straight, now here...
...
...
ObjectOutputStream out = new
ObjectOutputStream(res.getOutputStream());
System.out.println("Inside isReq after out obj");
out.writeInt(w);
out.writeInt(h);
out.writeObject(pixels);
}
/**
try{
res.setContentType("text/html");
printer=res.getWriter();
printer.println("Object Writing done");
printer.close();
}catch(Exception ex){}
}
else{
printer.println("Object Writing <b>Not</b> done");
printer.close();
}**/
After Object writing is being done , I wish to display a html page
(with applet embedded) but using the above code it is giving me a
error "IllegalStateException: Writer being already used by the
servlet..."
Can anyone help me out...
Regards
Ray
- 14
- Which WebSphere productsHi,
I want to develop some portal application with WebSphere. There are
quite a few modules/plugins for WebSphere. I don't know which ones are
useful. I downloaded the following WebSphere related products:
- WebSphere Application Community Edition Version 2 (for Solaris 10)
- Eclipse SDK (3.3.1.1) for Windows
- RAD_V7.0_Part(1-10)
I don't know how useful is RAD_V7.0.
I also found IBM website also have a product called "WebSphere Portal
V6.0". I am confused which products I need to download? The
requirement of my development is shown as below:
Mandatory:
- Develop Portal and Portlets.
- Interact with MySQL database engine (3.0)
Optionally:
- UML (able to reverse engineering).
Can anyone please tell me what modules I need to download? and where
can I download it?
I may be need to give a call to IBM to get a trail version of CDs that
include these application. But I want to know how I need in this
development.
Thank you very much in advance.
- 15
- WHICH J2ME Development Tool?Hello,
After researching the J2ME development tools, I finally decided on NetBeans
and I downloaded it today, with the mobility pack. I found NetBeans be very
powerful, yet I am just starting with Java. NetBeans overwhelmed me, even
with the simple NetBeans-generated "Hello World" MIDLet. I need a simpler
and less powerful development tool. Which development tool do you use for
J2ME? Thank you very much.
Best Regards,
T.I.
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