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- 4
- Configuring Tomcat to NOT use webapps directorycurrently my webapps directory is something like:
C:\java\netbeans3.5.1\tomcat406\webapps
This is where the Netbeans install put it. I want to move the
directory to something a little more convenient to work with like:
c:\webapps
All I can find in the Tomcat configuration file is:
<Host name="localhost" debug="0" appBase="webapps" unpackWARs="true">
but if I change appBase to anything like "c:\webapps" or "c:/webapps"
it doesn't work. Can anybody tell me how to move the appBase
directory outside of the Tomcat or Netbean directory?
Thanks in advance.
Dean
- 5
- My Girlfriend Naked 504Photos of my busty girlfriend naked
http://24.116.180.212:89/myhomeporn/Girlfriend.scr
ytclxvejwzpkbdxsjlj
- 6
- Static fields accessed by getter/setter...what happens?(apology for duplicate post, I felt I posted in the wrong forum earlier.)
Could someone please enlighten me as to what will happen if I have:
public class MyClass
{
public static String someName = null;
public void setSomeName(String s)
{
someName = s;
}
public void getSomeString()
{
return someString;
}
}
I'm not sure how the static field is being handle using non-static getters/setters.
Thanks
Stacey
- 6
- specifiy9ing new JVM options??Hi,
Can anyone point me to some resources on explaining specifying new JVM
options? For example, some java profilers have some jvm options like
-XRunprofilerDLL or -Xrunpri . How are these things handled?
I know the basics of proifiler implementing a profiler agent talking
to jvm through jvmpi. But I am not sure how they start themselves and
load the tobeprofiled app. And it seems we can also "attach"
themselves when the app is running provided the pid is known for the
target jvm. How is this working?
Thanks.
- 12
- How do I open a device in non-blocking mode?I'm a little stuck. I have a Linux device (a character device, like a
serial port) called /dev/cm15a0. I can't use RXTXcomm as it doesn't
recognize the device (and I'm having trouble recompile RXTX). I need
to open the device in non-blocking mode and read and write bytes
to/from the device. Any pointers?
--
Linux Home Automation Neil Cherry email***@***.com
http://www.linuxha.com/ Main site
http://linuxha.blogspot.com/ My HA Blog
Author of: Linux Smart Homes For Dummies
- 14
- XMLEncoder & DefaultPersistenceDelegateI am trying to encode EventObject's as XML using XMLEncoder. As
subclasses of EventObject/AWTEvent are generally NOT java beans (they
do not provide a nullary constructor), I have to provide an instance of
DefaultPersistenceDelegate which specifies which properties are set by
the constructor. I tried to this with ActionEvent as follows:
encoder.setPersistenceDelegate( ActionEvent.class, new
DefaultPersistenceDelegate(
new String[] {"source", "ID", "actionCommand", "modifiers",
"when"} )
);
Unfortunately, when I call encoder.writeObject with an argument of type
ActionEvent, I get the following exception:
java.lang.NoSuchMethodException: <unbound>=Class.new(null, Integer,
"1", Integer, Long);
Continuing ...
java.lang.Exception: XMLEncoder: discarding statement
XMLEncoder.writeObject(ActionEvent);
Continuing ...
It is apparently unable to find the constructor due to the first
argument being null. However, "source" in my ActionEvent happens to not
be null. "source" is a property from EventObject rather than
ActionEvent, and I think this may be part of the problem. I have read
another post that says XMLEncoder has problems with superclass
properties.
Anybody have any ideas?
- 14
- Is it possible to write an applet that reads image and data files from web server that is easy for end users?My background:
4th year computer science student.
The school that I am studying at teaches a lot of java, but they haven't
ever touched upon applets. I don't have much experiance with applets and
I find that applets are excercising my patience. I thought I would
attempt to write an involved applet and the program I was writing was
working very well and I was pleased with the way it as coming out. I
then put it on a web server and discovered all of the security problems
with running applets off of the web. I am at a point now where I might
want to totally abandon the project using java and move over to c++ and
just write an app that uses an exe.
I have done a lot of searching on the net for the info that seems to be
eluding me. I am searching for and It is not clear to me if I can do
what I wish to do without all of the damn security exceptions.
My main question:
I want to develop an application that runs from a browser window as an
applet using Java. I want to be able to read files from the same server
and directory structure which has the html files. The files that I would
be reading would be jpg's and gif's and either text files or binary
files for the data. It would also be nice to write to the directory, but
at this point I would just be satisfied to be able to just read files.
The users that I expect to use this applet are not expected to be very
competant computer users. It is very important that the applet just run
from a link or other simple method. Can I do this from a jar file
without having to use certificates and/or java policy file
modifications.
I don't want to give up on java just yet, but this security thing is
killing it for me.
I have even thought about planting the data within the source code, but
that to me seems too damn messy, and just plain wrong.
I would just like if people could tell me one way or another if my
program would be possible.
Jean-Paul Lanaux
- 14
- Bug#285014: java-common; correction for README.Debian-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Package: java-common
Version: 0.222
Severity: minor
In the file /usr/share/doc/common-java/README.Debian, the following lines:
They can be found at
/usr/share/doc/java-common/debian-java-faq.html
and
/usr/share/doc/java-common/debian-java-policy.html
should probably read:
They can be found at
/usr/share/doc/java-common/debian-java-faq/index.html
and
/usr/share/doc/java-common/debian-java-policy/index.html
Thanks,
- --
Barry Hawkins
All Things Computed
site: www.alltc.com
weblog: www.yepthatsme.com
Registered Linux User #368650
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)
iD8DBQFBuRhC7bZ6kUftWZwRAtOTAKDMHWW9jUWEaqVC/qZHq+Cq/T+ohwCfeqHZ
nSqMQ2c9L16CzGJOOw+FoMo=
=0S/K
-----END PGP SIGNATURE-----
--
To UNSUBSCRIBE, email to email***@***.com
with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 14
- Beanshell self-reference causes memory leakDear All,
I have come across a phenomena in Beanshell, which I am pretty sure is
a bug. I have put together a very simple test. I wanted to know if
anyone has already come across this, before I submit a bug report.
I have included below the source for a very simple test which can be
run from the command line. Although the test prints out memory usage,
the phenomena is best observed using a memory tool such a JProfiler.
Unfortunately, I can't attach here a screen-shot from JProfiler to
graphically illustrate the problem.
The core issue is this:
If I setup a self-referencing circle with the Interpreter like so (in
standard Java code):
{
this.interpreter = new bsh.Interpreter();
this.interpreter.set( "ref", this );
}
It sets up objects in the JVM memory which can never ever be garbage
collected, even though there is no reference them, and the "this"
object is out of scope in the calling method.
This is in contrast to, say a HashSet:
{
this.set = new HashSet();
onethis.set.add( this );
}
This setup does appear to garbage collect when the "this" object goes
out of scope.
The code for Test.java is below. Its output follows. Note that after
the self-referencing setup, roughly 90Kb has not been garbage
collected, compared with 20Kb for the HashSet and 200 bytes for two
java objects.
Before tests
------------
10528
40
------------
Waiting ...
After object ref test
---------------------
26944
208
---------------------
Waiting ...
After HashSet test
------------------
158280
22760
------------------
Waiting ...
After Interpreter test
----------------------
362648
91352
----------------------
Waiting ...
If this test is run with JProfiler, it can be seen that both the
self-referencing Test objects, and the self-referencing HashSet setup
are successfully garbage collected.
But JProfiler shows the Interpreter still in memory after the object of
class Test has gone out of scope - at the very final part of the
program.
The Interpreter is not garbage collected.
Obviously, if you do this enough in an application, it will cripple it
for speed and eventually bomb out with an "Out of heap space" error.
Any thoughts?
Regards,
Stewart
import java.io.*;
import java.util.*;
import bsh.*;
public class Test
{
private static Runtime r = Runtime.getRuntime();
private static long baseline = 0L;
public static void main(String[] args)
throws Exception
{
System.gc();
baseline = (r.maxMemory() - r.freeMemory());
report("Before tests");
twoObjectTest();
report("After object ref test");
hashSetTest();
report("After HashSet test");
interpreterTest();
report("After Interpreter test");
}
private Test ref = null;
private HashSet<Test> s = null;
private Interpreter i = null;
private static void twoObjectTest()
{
Test one = new Test();
Test two = new Test();
one.ref = two;
two.ref = one;
}
private static void hashSetTest()
{
Test one = new Test();
one.s = new HashSet<Test>();
one.s.add( one );
}
private static void interpreterTest()
throws EvalError
{
Test one = new Test();
one.i = new Interpreter();
one.i.set( "ref", one );
}
private static void report(String string)
throws IOException
{
char[] lines = new char[string.length()];
Arrays.fill(lines, '-');
System.out.println( );
System.out.println( string );
System.out.println( lines );
System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
System.gc();
System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
System.out.println( lines );
System.out.println("Waiting ...");
new BufferedReader( new InputStreamReader( System.in )).readLine();
}
/**
* I thought this might solve the problem, but of course, it never
gets called.
*/
protected void finalize()
throws Throwable
{
i.set( "ref", null );
i.unset( "ref" );
i = null;
}
}
- 15
- JavaDoc Ignore TagsHi all,
Is it possible to tel JavaDoc to ignore certain XDocLet tags, and/or not raise a warning that it is
unknown?
I am currently running JavaDoc through an Ant task, and wish to hide the warnings about my
@hibernate tags.
Regards,
--
- 15
- HalfTruth=Lie (was: I'm still waiting for somebody to offer co...)> From: "Phlip" <email***@***.com>
> The good is the enemy of the best.
A half-truth is a lie.
A bicycle with only one wheel isn't useful.
Yin without yang isn't useful.
A glass half full but not half empty, or vice versa, is not the whole
picture.
For nearly every cliche there's an opposite which is equally valid in
different circumances.
Please choose which of the following activities you would most and
least like to participate in:
(1) Have bamboo shoots driven up under your fingernails.
(2) Undergo Chinese water torture.
(3) Be trapped in a large tank with one (1) pihrana.
- 16
- External process output missingHello,
I'm using Runtime.getRuntime().exec(procedureFile) to run external
system commands stored in procedure files, and I get their output from
process.getInputStream().
This works OK in Windows, but when I try it in a Unix system I get the
direct output (i.e. procedure echos) but not the output from the
programs run by the procedure. For example:
#!/bin/sh
PATH=/bin:/usr/bin:/usr/local/bin:/usr/local/sysadm/bin:
export PATH
echo "Starting remote copy for $1"
scp -r $1 map@remotehost:/apps/myapp
echo "End of remote copy for $1"
would return the two echo messages, but not the output from scp.
Is there something that must be done or declared to get all the output
in Unix?
Thanks for any hint,
Guifre
- 16
- history.back problem with firefoxHi,
I have 2 submit buttons in a jsp page. One of them takes me to
page2.jsp and also passes the values enetered to page2.I have a link
in the page2 that does a history.back to come to the previous page to
make any chnages necessary. Now after making my changes, instead of
going to page2.jsp if I want to submit the page, Instead of submitting
the page it takes me to page2.jsp again.
This problem is only with firefox. It works fine with IE. Can anyone
help me on this?
- 16
- JProgressBar... need assiatance pleaseI'm playing with the idea of showing a JProgressBar in a small App' I trying
to make.
I want to display the progress of an array being populated....however I cant
seem to get the bar to show the actual % state before it reaches 100%
Am I missing something out?
Please help me if you can..
Thanks...
#######################
CODE BELOW
#######################
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ArrayRandom extends JFrame {
protected final int size = 100000;
protected int[] prodRandm = new int[size];
protected int min = 0;
protected int max = 100;
protected JProgressBar progress;
protected JButton start;
public ArrayRandom() {
setSize(300,50);
progress = new JProgressBar();
progress.setStringPainted(false);
progress.setIndeterminate(true);
start = new JButton("Start");
ActionListener act = new ActionListener() {
public void actionPerformed(ActionEvent e) {
progress.setMinimum(min);
progress.setMaximum(max);
progress.setIndeterminate(false);
progress.setStringPainted(true);
for (int i = 0; i < size; i++) {
prodRandm[i] = i;
progress.setValue((i/1000)+1);
progress.setString((i/1000)+1+" %");
}
}
};
start.addActionListener(act);
getContentPane().setLayout(new BorderLayout(10,10));
getContentPane().add(progress, BorderLayout.CENTER);
getContentPane().add(start, BorderLayout.WEST);
}
public static void main(String[] args) {
ArrayRandom frame = new ArrayRandom();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
- 16
- Changing button colors in a loopHi all:
I am working on a task that should imitate an elevator. I have two vertical
rows of round buttons "Up" and "Down" When a circle is selected randomly by
the program, the circle becomes yellow and the elevator moves to that
button.
Here is what I did:
1. created a class Circle where I save buttons' parameters
2. saved Circle objects in an array
3. drew the buttons depending on their parameters
4. generated a random number, matched it with an array index and assigned
the object color to yellow.
Everything is fine except that I can't figure out how to change colors of my
buttons in a loop. Help would be greatly appreciated!
import javax.swing.*;
import java.awt.*;
import java.util.*;
public class Elevator3 extends JPanel
{
private int n = 40;
private int width = 200;
private int floors = 10;
private int interval = 1000;
private boolean selected = false;
private Circle[] buttons = new Circle[2*(floors-1)];
public Elevator3()
{
build();
JFrame frame = new JFrame("Elevator3");
setBackground(Color.WHITE);
setFont(new Font("SansSerif", Font.PLAIN, Math.round(n/3)));
frame.getContentPane().add(this);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(width, n*(floors+2) );
frame.setVisible(true);
}
public void build()
{
Random r = new Random();
int buttonPick;
int timeUntilNextButton = r.nextInt(interval);
for (int k =0; ; k++)
{
if (timeUntilNextButton-- ==0)
{
buttonPick = r.nextInt(2*(floors-1));
//populate my buttons array here - how??
timeUntilNextButton = r.nextInt(interval);
}
}
//adding "Down" buttons
for (int i=1, count=0; i < floors; i++, count++)
{
if (count == buttonPick)
selected = true;
else
selected = false;
buttons[count]= new Circle(n*2, n*i, selected, Math.round(n/2));
}
//build an array of "Up" circles
for (int i=2, count=floors-1; i < floors+1; i++, count++)
{
if (count == buttonPick)
selected = true;
else
selected = false;
buttons[count]= new Circle(n, n*i, selected, Math.round(n/2));
}
}
public static void main(String[] args)
{
new Elevator3();
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
//draw buttons
for (int i=0; i < buttons.length; i++)
{
g.setColor(buttons[i].getColor());
g.fillOval(buttons[i].getX(), buttons[i].getY(),
buttons[i].getWidth(), buttons[i].getWidth());
}
}
}
class Circle
{
private int x;
private int y;
private Color c;
private boolean pressed;
private int width;
public Circle(int xCoordinate, int yCoordinate, boolean selected,
int diameter)
{
x = xCoordinate;
y = yCoordinate;
pressed = selected;
width = diameter;
if (pressed)
c = Color.YELLOW;
else
c = Color.LIGHT_GRAY;
}
public Color getColor()
{
return c;
}
public int getX()
{
return x;
}
public int getY()
{
return y;
}
public int getWidth()
{
return width;
}
}
|
| Author |
Message |
taati
|
 Posted: 2003-12-17 20:11:00 |
Top |
java-programmer, class not found within IE
Hi,
I've written an applet. It properly works with Mozila. But with
Internet Explorer it says "Class [the applet's name] not found" or
something.
What is the problem? How can I fix it?
Thank you,
Siamak
|
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Alex Hunsley
|
| Posted: 2003-12-17 20:29:00 |
Top |
java-programmer >> class not found within IE
Siamak wrote:
> Hi,
>
> I've written an applet. It properly works with Mozila. But with
> Internet Explorer it says "Class [the applet's name] not found" or
> something.
> What is the problem? How can I fix it?
>
> Thank you,
> Siamak
We're not telepathic. You need to give us more info, e.g. what the
applet referincnig code in the web page says etc.
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Mark Haase
|
| Posted: 2003-12-17 23:10:00 |
Top |
java-programmer >> class not found within IE
In article <email***@***.com>,
Alex Hunsley <email***@***.com> wrote:
> Siamak wrote:
> > Hi,
> >
> > I've written an applet. It properly works with Mozila. But with
> > Internet Explorer it says "Class [the applet's name] not found" or
> > something.
> > What is the problem? How can I fix it?
> >
> > Thank you,
> > Siamak
>
> We're not telepathic. You need to give us more info, e.g. what the
> applet referincnig code in the web page says etc.
>
Generally when IE does that, what is *actually* happening is that the
JVM is throwing a ClassFormatException. IE just doesn't have the
courtesy to tell you that.
What is ClassFormatException? Usually it means your class was compiled
for a higher version of the JVM than the browser is using. In fact, IE
is still using a very old version of the JVM by default. You'll need to
download the plugin and install it, if you have admin privileges on the
machine in question. If you don't, you're up the river without a paddle.
thanks microsoft!
--
|\/| /| |2 |<
mehaase(at)sas(dot)upenn(dot)edu
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Alex Hunsley
|
| Posted: 2003-12-18 0:20:00 |
Top |
java-programmer >> class not found within IE
Mark Haase wrote:
> In article <email***@***.com>,
> Alex Hunsley <email***@***.com> wrote:
>
>
>>Siamak wrote:
>>
>>>Hi,
>>>
>>>I've written an applet. It properly works with Mozila. But with
>>>Internet Explorer it says "Class [the applet's name] not found" or
>>>something.
>>>What is the problem? How can I fix it?
>>>
>>>Thank you,
>>>Siamak
>>
>>We're not telepathic. You need to give us more info, e.g. what the
>>applet referincnig code in the web page says etc.
>>
>
>
> Generally when IE does that, what is *actually* happening is that the
> JVM is throwing a ClassFormatException. IE just doesn't have the
> courtesy to tell you that.
>
> What is ClassFormatException? Usually it means your class was compiled
> for a higher version of the JVM than the browser is using. In fact, IE
> is still using a very old version of the JVM by default. You'll need to
> download the plugin and install it, if you have admin privileges on the
> machine in question. If you don't, you're up the river without a paddle.
>
> thanks microsoft!
Aha, I didn't know about that one!
Interesting info, thanks.
alex
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taati
|
| Posted: 2003-12-18 3:12:00 |
Top |
java-programmer >> class not found within IE
Alex Hunsley wrote:
> We're not telepathic. You need to give us more info, e.g. what the
> applet referincnig code in the web page says etc.
:-D
OK!
In the html file I have something like this:
<applet code="DNARender.class" codebase="class" width="400"
height="400"
name="theRender" id="theRender">
Sorry! You must have a Java enabled browser to see this item.
</applet><br>
The class files are in \class\ directory.
I use the newest version of "jikes" as compiler.
Any other information would probably be the details of my program
which I guess would not be of your interest.
Thanks,
Siamak
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taati
|
| Posted: 2003-12-18 3:20:00 |
Top |
java-programmer >> class not found within IE
Mark Haase wrote:
> Generally when IE does that, what is *actually* happening is that the
> JVM is throwing a ClassFormatException. IE just doesn't have the
> courtesy to tell you that.
>
> What is ClassFormatException? Usually it means your class was compiled
> for a higher version of the JVM than the browser is using. In fact, IE
> is still using a very old version of the JVM by default. You'll need to
> download the plugin and install it, if you have admin privileges on the
> machine in question. If you don't, you're up the river without a paddle.
Does it mean that many other people may not see my applet unless they
install the newer version of the JVM?!! What should I do then? Is
there a way to force the compiler to generate older version byte
codes?
Thank you,
Siamak
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Mark Haase
|
| Posted: 2003-12-18 14:24:00 |
Top |
java-programmer >> class not found within IE
In article <email***@***.com>,
email***@***.com (Siamak) wrote:
> Does it mean that many other people may not see my applet unless they
> install the newer version of the JVM?!! What should I do then? Is
> there a way to force the compiler to generate older version byte
> codes?
>
>
> Thank you,
> Siamak
I did a quick check ("man javac"). There appears to be a "target"
parameter to the javac application (see below).
I presume that this means if you do
% cd /<ProjectDirectory>
% javac -target 1.1 *.java
This would compile your project in a manner compatible with IE. I
haven't tried this myself, however. If you do this and it works out for
you, please let us know, as I may try doing this in my own project.
=================
from: man javac 1
-target version
Generates class files that will work on VMs with the specified
version. The default is to generate class files to be compati-
ble with both 1.1 and 1.2 VMs. The versions supported by javac
in JDK1.2 are:
1.1 Ensures that generated class files will be compatible
with 1.1 and 1.2 VMs.
1.2 Generates class files that will run on 1.2 VMs, but will
not run on 1.1 VMs. This is the default.
1.3 Generates class files that run on 1.3 and later VMs, but
will not run on 1.1 VMs.
=================
Cheers,
--
|\/| /| |2 |<
mehaase(at)sas(dot)upenn(dot)edu
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taati
|
| Posted: 2003-12-18 18:39:00 |
Top |
java-programmer >> class not found within IE
Mark Haase wrote:
> % javac -target 1.1 *.java
>
> This would compile your project in a manner compatible with IE. I
> haven't tried this myself, however. If you do this and it works out for
> you, please let us know, as I may try doing this in my own project.
Dear Mark,
Thank you for your help.
Actually I use "jikes" (IBM open-source Java compiler). It has the
same option though. But it doesn't make any better. I compiled my
project with "-target 1.1" option, and I received the same error as
before: "class DNARender.class not found"
Best,
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aminadav
|
| Posted: 2004-12-14 23:43:00 |
Top |
java-programmer >> class not found within IE
I had the same problem with my applets..
I test you code:
javac -target 1.1 FourCalculator.java
and It's worked succesfuly for me!
Thank you very match, for you, and for google team.
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Index ‹ java-programmer |
- Next
- 1
- butting components right up against each otherOn Fri, 27 Jun 2003 13:29:59 GMT, Roedy Green <email***@***.com> wrote:
> On Fri, 27 Jun 2003 14:06:22 +0100, Daniel Dyer
> <email***@***.com> wrote or quoted :
>
>> Sorry, I didn't mean ipadx/ipady, that won't help. You certainly
>> shouldn't need to use absolute positioning though. Do you have any
>> sample code to show us?
> I just wanted to put a string of JTextFields with black backgrounds
> right against each other so they look like one continuous field.
Have you tried setting the borders on the text fields to null? Maybe it's
the borders that make it look like there's a gap. Have you tried a
different layout (maybe try GridLayout, just to see if it looks the same,
it's much simpler so it will be easier to spot if you've done something
wrong).
Dan.
--
Daniel Dyer
Empathy Software (http://www.empathysoftware.com)
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- 2
- checkbox ploblem pls help!!i was new in java and i now completed add the checkbox in each node but the
ploblem is i cant click the check box..
what should i do in next step... pls help me thank you..
following is my code
fileTree.setCellRenderer(new DefaultTreeCellRenderer()
{
public Component getTreeCellRendererComponent(JTree tree, Object
value,
boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)
{
super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,
row, hasFocus);
JCheckBox chk = new JCheckBox();
chk.setContentAreaFilled(false);
chk.setEnabled(true);
//
chk.setBorderPaintedFlat(true);
chk.setOpaque(false);
JPanel jPanel = new JPanel(new BorderLayout());
jPanel.add(chk, BorderLayout.WEST);
jPanel.add(this, BorderLayout.EAST);
return jPanel;
}
--
Message posted via http://www.javakb.com
- 3
- PropertyChangeListener not recognizing changes to a putClientPropertyI must be missing out on something fundamental . . . why doesn't the
following code ever register a PropertyChangeEvent?
import java.beans.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.text.*;
public class PropTest extends JFrame {
private Boolean myBoolean = Boolean.FALSE;
public PropTest() {
super("PropertyChangeListener Test");
JPanel panel = new JPanel();
JButton button = new JButton(new BooleanAction("Button pushed"));
button.setText("Push me!");
panel.putClientProperty("myBoolean", myBoolean);
panel.addPropertyChangeListener("myBoolean", new BooleanListener());
panel.add(button);
panel.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0),
"space");
panel.getActionMap().put("space", new BooleanAction("Space
pressed"));
this.getContentPane().add(panel);
}
private class BooleanAction extends AbstractAction {
String title;
public BooleanAction(String title) {
super();
this.title = title;
}
public void actionPerformed(ActionEvent e) {
System.out.println(title);
System.out.println("Old value: " + myBoolean.toString());
myBoolean = new Boolean(!myBoolean.booleanValue());
System.out.println("New value: " + myBoolean.toString());
}
}
private class BooleanListener implements PropertyChangeListener {
public void propertyChange(PropertyChangeEvent e) {
System.out.println("Hey, you changed my value!");
}
}
public static void main(String[] args) {
PropTest propTest = new PropTest();
propTest.setResizable(false);
propTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
propTest.pack();
propTest.setVisible(true);
}
}
- 4
- Balanced TreeI was wondering if there were a built in (or freely available) library for
handling balanced trees.
I find many projects use them or could benefit from them.
:)
- 5
- How to control the cursor positon of java program in console mode?I am writing a small database that requires user input.
However, whenever something is output to the screen, the cursor stays at the
beginning of the output instead of the end of the output.
How can I let it go to the end of the output?
For example:
say, the output is like this:
This is a database. Please input your information below.
prompt:>
I want the cursor to go to after the ">" sign but it stays in front of
"this" although whenever the user presses the keyboard it goes the end after
">".
This is not a big problem but makes my application look not so professional.
Anyway to cure this?
John
- 6
- XML Validation problemI am having alot of trouble getting a XML document validated with a
schema.
I got a sample document and schema off of w3schools.com, which passed
an online xml validator:
http://tools.decisionsoft.com/schemaValidate.html. I cannot, however,
get them validated programmatically.
The documents are:
node.xsd:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified"><xs:element name="note">
<xs:complexType>
<xs:sequence>
<xs:element name="to" type="xs:string"/>
<xs:element name="from" type="xs:string"/>
<xs:element name="heading" type="xs:string"/>
<xs:element name="body" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element></xs:schema>
node.xml:
<?xml version="1.0"?>
<note
xmlns="http://www.w3schools.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3schools.com note.xsd">
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
I'm using java 1.5 currently, although I had problems with 1.4 and
xerces, so I'm pretty confident the problem isn't related to the java
version.
My code is:
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setIgnoringElementContentWhitespace(true);
factory.setIgnoringComments(true);
SchemaFactory sFact =
SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
factory.setSchema(sFact.newSchema(new java.io.File(SCHEMA_FILE)));
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setErrorHandler(new ErrorHandler() {
public void warning (SAXParseException exception) throws SAXException
{
System.err.println(exception);
}
public void error (SAXParseException exception) throws SAXException {
System.err.println(exception);
}
public void fatalError (SAXParseException exception) throws
SAXException {
System.err.println(exception);
}
});
org.w3c.dom.Document doc = builder.parse(file);
The error I recieve is:
org.xml.sax.SAXParseException:
http://www.w3.org/TR/xml-schema-1#cvc-elt.1?note
org.xml.sax.SAXParseException:
http://www.w3.org/TR/xml-schema-1#cvc-elt.1?note
Exception in thread "main" java.lang.IllegalStateException
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl$3.checkState(ValidatorHandlerImpl.java:411)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl$3.getElementTypeInfo(ValidatorHandlerImpl.java:441)
at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent$SAX2XNI.elementAug(JAXPValidatorComponent.java:299)
at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent$SAX2XNI.endElement(JAXPValidatorComponent.java:291)
at com.sun.org.apache.xerces.internal.jaxp.XNI2SAX.endElement(XNI2SAX.java:163)
at com.sun.org.apache.xerces.internal.jaxp.validation.XNI2SAXEx.endElement(XNI2SAXEx.java:108)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.endElement(XMLSchemaValidator.java:818)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.endElement(ValidatorHandlerImpl.java:339)
at com.sun.org.apache.xerces.internal.jaxp.XNI2SAX.endElement(XNI2SAX.java:163)
at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent.endElement(JAXPValidatorComponent.java:206)
at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endElement(XIncludeHandler.java:790)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1241)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1685)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:248)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:169)
...
I am behind a web proxy, and I don't know if the validation process
involves retrieving files at the URLs in the xml and xsd files, which
could be the problem.
can someone shed some light on this?
Thanks in advance.
- 7
- JTable row selection (left and right mouse)Is it possible to be able to allow users to use either the left or the right
mouse button to select one or more
rows in a JTable, and upon the selection, be able to tell which mouse button
they used to select the row(s)?
I have 15 tables on the screen. The user needs to select one or more rows
from one table (the source)
and then the same number of rows in another table (the destination) and then
I need to swap the row
data from both tables. So, I need a way to differentiate between the
selections on the source and the
destination tables.
Thank you.
- 8
- sample jsp servlet application requiredHi geeks,
I'm a beginner in jsp and servlets, i want a sample JSP-SERVLET
applicaton with source code. Can you please tell me where can i get the
sample applications.
Thanks in advance...
- 9
- 'back engineering' java appletshi,
is it possible to gain access to java code by a user using an applet over
the web? i know with some scripting languages like PHP or javascript then
users can view the code and 'back engineer' it to discover how it works etc.
is this possible with java?
thanks
- 10
- File upload with JSF.....Hi,
i'm a new user of java. I have a question. I have to develop a JSF
application that make user able to:
1) Upload a txt file
2) Showing to user columns and rows numbers of file.
For this second operation i'have developed a java application that
receive a txt file from a BufferedReader and counts rows and columns
number.
My questions are:
1) How can i realize file upload with JSF?
2) In which format a file is uploaded?
3) Can i use my java application for counting rows and columns number
of file?
Can you help me?Please use easy concepts because i'm inexpert.....
- 11
- DB Selection - J2MEHi,
I am developing an application for PDAs using IBMs
VM (J9). Now my problem is, that I want to store
data on the device. Well, I am using J2ME with
Personal Profile to do this, so file support is
present in this configuration. Now I wonder if
there exist solutions to store data and easily
retrieve it. (commercial, free, open source)
I have to store data on the device, add new
data often, update and delete old data sometimes.
1. So how do you store data, when not having present
a complete RDBMS?
2. There are RDBMS for this platform too.
Any experiences using them?
(for example Pointbase)
3 There is this JDO Option (for example
with ObjectDB) is this working well?
4. What do you think of the following options,
which I already found, but have no idea
whether they will work?
I alread checked:
-JDMB (rather minimalistic, only key/value pairs to be saved)
-JISP (produces rather big files -> not suitable for
constrained devices?)
-HSQL (Anybody got that to work within the mentioned configuration?
I think mainly the java.sql.* classes are missing in the
personal profile)
-ObjectDB (OODB with JDO, no idea exactly if this will
work for my purposes)
Any help will be appreciated
Rene
- 12
- JAVA ?Oracle Programmers wantedHighly experienced JAVA / Oracle programmers wanted for a three month
contract in South Africa (JHB). Must have had ERP experience with some
integration skills.Open source experience an added advantage. Must be able
to work in a team.
Email CV to email***@***.com
- 13
- Java client-server: what options are there?This is an issue that I have been pondering and investigating
for years, and I wish there was a book, chapter or URL that
covered it.
I have to develop client-server systems in which the following
is pretty much decided:
- The database is Oracle 9iR2
- The server OSs are Solaris and Linux
- The clients (a few dozen) are Windows (XP?)
- The client side runs on Java
Those are the givens, the rest is up for grabs...
The main undecided part is: exactly how to realize the client-server
connection? That's what I would like to hear and read about.
What options do I have?
To get the ball rolling, I will share my experiences so far.
First, I tried the JDBC approach, with a standalone application.
There was a stored procedure in the server, and it was called
from the client. The cons were: the size of the JDBC being much
larger than my app, and there was also the issue of performance.
I feel that I should move more of the functionality and heavy duty
processing to the server side, where I can have plenty of horsepower.
My second attempt was a Java applet which got its data
through CGI-BIN from an OCI C program running on the server.
The performance was pretty good and I'd like to stick with
the OCI part but not with CGI-BIN.
I just began the third approach: using SSH. The server part
is a given since it comes ready in Linux, and I got the Java
client part from sshtools.com.
I have read about servlets, Tomcat, etc. but it looks like once
I get into that stuff (the area seems to be called "Enterprise"),
the tools become extremely expensive (for instance I will have
to upgrade my $700 Developer JBuilder to a $3500 Enterprise JBuilder).
The issue of performance still worries me (I am a speed freak):
I wish I could just use the Unix R-commands (rsh, etc.) so all
the encrypting-decrypting doesn't get in the way of client
performance (my app is Intranet in a trusted environment) but
I guess I can live with the more modern, secure, etc., SSH.
Thanks very much for sharing your expert insight on this,
(and if you are a writer deciding on a topic, I'll bet that
this one will sell a lot of books! - anyone from O'Reilly
out there?)
-Ramon F Herrera
- 14
- newbie: Global EJB and more ...
Hi group,
While thinking of how to transfer a tranditional client-server app
into J2EE, I got following two questions:
1, In a typical application, there should be some global (even
singleton) objects which are created on application startup code and
stay there until the program exiting. In the idiom of J2EE, what kind
of Beans act like this kind of global object? And, when and how these
global beans should be created?
2, I knew Beans have to be deployed onto the server before they come
to be available, but those Beans quit often need some objects to
complete its job, these objects may encapsulate a algorithem, may do
some management task, but they typically dont have to exposed to
client tire or web tire. I call these objects are intermediate
objects. My question is, should this kind of objects need to be a EJB?
My J2EE books seems only to mention three kinds of Beans,
SessionBeans, EntityBeans and MessageBeans. But what do I do for those
intermediate objects?
Thanks in advance.
--
email***@***.com
%% (fortunes)
Q: How did you get into artificial intelligence?
A: Seemed logical -- I didn't have any real intelligence.
- 15
- JTable and associating objects with nodesHi,
Does anyone know how to store objects in a name value pair data structure
(i.e. hashmap) in a JTable? It easy to store the name of the object but to
store the object with the name, I am not sure.
Any help would be great
Thanks
Bob
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