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Index ‹ java-programmer
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- 4
- cult3d e javaHo compilato un java per usarlo con cult3d ma quando lo chiamo dal cult mi
ritorna questo errore:
java.lang.NoClassDefFoundError
at com/ms/security/SecurityClassLoader.internalDefineClass
at com/ms/security/SecurityClassLoader.defineClass
at com/cult3d/IECult3DClassLoader.loadClass
at com/cult3d/IECult3DMain.event
Succede lo stesso anche se provo a compilare un esempio base di cult, a
questo punto penso di dover cambiare qualcosa nella procedura di
compilazione.
Qualcuno ha gia' sbattuto la testa contro questo errore?
- 4
- 4
- Runtime - external program visibility
Hello,
i use the getRuntime method to start an external program out of
my Java app: Runtime.getRuntime().exec(cmd);
where cmd is an array of String
String[] cmd =
{ "\"c:/Whatever.exe\"","/user=User","/password=XXX"};
Now the issue is that the program (Whatever.exe) starts, it
accepts the parameters (user,password), - the / is required by
Whatever.exe - but the window of the application Whatever.exe is
not visible! The process is there (one can see it in the
taskmanager).
In Delphi i have the possibility by using Windows.CreateProcess
and passing a "StartupInfo"
(lStartupInfo.dwFlags:= STARTF_USESHOWWINDOW;
lStartupInfo.wShowWindow:= SW_SHOWNORMAL;) but here in Java i dont see a possibility of determining in which way the external app is being started up or determining its visibility.
kind regards
Oliver
- 5
- Seeing if a string equals NullHow can you test a string to see if it is null? I have tried the
following code but it throws a nullpointerexception.
for (int i = 0; i < names.length; ++i) {
if (names[i].equals("null")) {
nullcount += 1;
}
- 5
- GCJ 4.1 and OpenOffice.orgFWIW, I have been working with Eric Anholt to have Kaffe (java/kaffe)
supported by bsd.java.mk. The only thing with miss is a port of a
Javadoc tool so that ports documentation may be built without any Sun or
IBM JDK. I believe gjdoc (can't remember if this part of classpath or
another "free" Java tool) could be used in place of javadoc.
I'll have a look at your wrapper and modifications in the next few days.
Herve
On Fri, Mar 10, 2006 at 10:59:35AM +0900, NAKATA Maho wrote:
> I believe gcj is now one of the usable Java implementation,
> however there are some small (but tedious) issues must be solved to
> check in to FBSD ports cvs repo.
> I made some ports or updates of ports so that we can at least compile a
> package using Java; OpenOffice.org. I believe with appropreate wrapper,
> we can add gnugcj as _JAVA_VENDOR_LIST in /usr/ports/Mk/bsd.java.mk.
> then we can use/comple Java applications without bootstrapping java/jdk14
> etc.
- 6
- Execute jar in program codeI have a jar file, without source code, say abc.jar.
I have set it in the CLASSPATH
The main execute class in abc.jar is a.class.
In the command prompt, I can execute the program by
issuing "java a < someIOfile"
But I would be like to embed it in my program.
Can I create a "dynamic" instance from it?
- 7
- awt Dialog color problemHi, I'm using jdk 1.1.8 on an embedded application which runs under Personal
Java on VxWorks (I think). But anyway, that may not matter. I'm displaying
an awt Dialog and the color of the title bar is a pretty ordinary looking
red. I'm guessing this comes from O/S like it would in MS Windows. I have
no access to the operating system to change this. Is there any way to
change system colours in java?
Chris.
- 8
- How to kill thread which is blocked by Serversocket.accept()?Hi;
I have got a network-thread running in the background listening for
connection-attempts.
The thread uses an instance of Serversocket and its accept() method to
listen.
After a certain period of time i want to kill the thread if no connection is
established.
The problem is: the accept-method blocks until someone connects.
Therefore it is not possible for me to use the interrupted-flag and check it
within a loop in my
thread to signalize it to end (the recommended way to kill a thread). I dont
want to use the thread.stop
() method since it is deprecated, but even when i try to use it i can not
kill the thread.
Within my gui thread i tried to use a swing timer, but it doesnt kill the
thread:
timer = new Timer(TEN_SECONDS, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (networkThread.isAlive) {
timer.stop();
networkThread.stop();
//...Update the GUI...
}
}
Anybody there who knows a proper way of killing such a blocked thread?
Thanks in advance,
Jan
- 8
- Signed applet focus problem,.Hello,
I have a jsp page which contains a signed applet which reads some
System properties.
I am using jdk 1.4.2_06. and IE 6.028.
When the signed certificate appears, if I click on the Internet
Explorer icon in the task bar, the certificate goes below the browser.
Now since the certificate is supposedly modal, My browser loses focus.
ie. I cannot bring the certificate to the front sans tabbing and the
browser will not respond to user input. The only way to get the
certificate to the front is by "tabbing" till I get to it.
Any one seen this behavior before? If so any suggestion would be
appreciated.
Thanks
Karl.
- 9
- Refer to current filename and line.Hi,
I remember this was possible in C with macros. Is it possible in Java
to refer to the current file name and line number as in
System.out.println( something.that.returns.current.file.name() + "
printed this line.");
Many thanks in advance!
Aaron
- 9
- OMLETv4: SPAM SPAM SPAM
--
Daniel A. Morgan
University of Washington
email***@***.com
(replace 'x' with 'u' to respond)
- 9
- Dying hype: Slowing sales of iPhone
Well, the hype sure died fast. For those morons who think 700k units
were sold over the weekend - hey idiots, that's an ESTIMATE from one
source, and the most generous one at that. The range of sales
estimates is from 250k to 700k.
In fact, some analysts have downgraded sales projections for next year
from 12 m to 8 million based on the fact that supply seemed to be more
than demand.
think about it morons. ur selling 8 million phones in a 1 BILLION unit
yearly market.
* laughing at the macnut tools who spent lots of money on a smudgy
underwhelming toy (so far), enjoying the nice breeze too
- 13
- reference to a jar file inside another jar fileHi, I need create a manifest file for a jar, but I need set the classpath in
the manifest file to reference a jar file inside the current jar file. My
idea is getting a single jar file which contains all the needed jar files.
- 14
- loading varablesI have a variable "book" which askes the user for four titles which will be
with one patron's name.
How would i load this with a loop?
Some how I am getting lost?
Thank you.
input Patron's name
name = reader.readLine("Enter the first patron's name: ");
patron.setName(p);
for (int i = 1; i <= 3; i++){
Book = reader.readLine("Enter the book's title: ");
Book.setBook(i, Book);
- 15
- Resizing images thru a java program
hi
I need to capture an image based on the URL of the image provided by
the user and do the following things
1. Create a thumbnail
2. Resize the image
I may have to store these two images locally or just recreate these two
images and display it in the browse.
What are the best tools to use to achieve this? I need a Linux/java
based solution. Will Imagemagick.org do the magic?
-- Mahesh
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| Author |
Message |
lovico
|
 Posted: 2005-2-16 20:14:00 |
Top |
java-programmer, JMF on pocket pc
I wrote an application for my iPAQ, and use JMF cross-platform
version, with Jeode, to playback a file.wav, but when the application
starts, the console shows these errors :
at com.sun.media.renderer.audio.JavaSoundRenderer.initDevice()
at com.sun.media.renderer.audio.JavaSoundRenderer.open()
at com.sun.media.BasicRendererModule.doPrefetch()
at com.sun.media.BasicTrackControl.prefetchTrack()
at com.sun.media.PlaybackEngine.doPrefetch1()
at com.sun.media.PlaybackEngine.doPrefetch()
at com.sun.media.PrefetchWorkThread.process()
at com.sun.media.StateTransitionWorkThread.run()
Why???
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Rhino
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| Posted: 2005-2-17 23:45:00 |
Top |
java-programmer >> JMF on pocket pc
"Fbx" <email***@***.com> wrote in message
news:email***@***.com...
> I wrote an application for my iPAQ, and use JMF cross-platform
> version, with Jeode, to playback a file.wav, but when the application
> starts, the console shows these errors :
>
> at com.sun.media.renderer.audio.JavaSoundRenderer.initDevice()
> at com.sun.media.renderer.audio.JavaSoundRenderer.open()
> at com.sun.media.BasicRendererModule.doPrefetch()
> at com.sun.media.BasicTrackControl.prefetchTrack()
> at com.sun.media.PlaybackEngine.doPrefetch1()
> at com.sun.media.PlaybackEngine.doPrefetch()
> at com.sun.media.PrefetchWorkThread.process()
> at com.sun.media.StateTransitionWorkThread.run()
>
> Why???
I'm guessing that it's because the code you wrote has a bug in it. However,
I'm not psychic so I can't debug code that you didn't post.
Rhino
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lovico
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| Posted: 2005-2-18 19:52:00 |
Top |
java-programmer >> JMF on pocket pc
"Rhino" <email***@***.com> wrote in message news:<9_2Rd.20195$email***@***.com>...
> "Fbx" <email***@***.com> wrote in message
> news:email***@***.com...
> > I wrote an application for my iPAQ, and use JMF cross-platform
> > version, with Jeode, to playback a file.wav, but when the application
> > starts, the console shows these errors :
> >
> > at com.sun.media.renderer.audio.JavaSoundRenderer.initDevice()
> > at com.sun.media.renderer.audio.JavaSoundRenderer.open()
> > at com.sun.media.BasicRendererModule.doPrefetch()
> > at com.sun.media.BasicTrackControl.prefetchTrack()
> > at com.sun.media.PlaybackEngine.doPrefetch1()
> > at com.sun.media.PlaybackEngine.doPrefetch()
> > at com.sun.media.PrefetchWorkThread.process()
> > at com.sun.media.StateTransitionWorkThread.run()
> >
> > Why???
>
> I'm guessing that it's because the code you wrote has a bug in it. However,
> I'm not psychic so I can't debug code that you didn't post.
>
> Rhino
The code is this:
import java.awt.*;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.FlowLayout;
import java.awt.event.*; //per WindowListner
import javax.media.*;
import java.io.*;
import java.util.*;
public class Prov {
public Player pl=null;
public static void main(String[] args)
{
Prov prov=new Prov();
}
public Prov()
{
Frame fr=new Frame("FRAME");
FlowLayout flow=new FlowLayout();
fr.setVisible(true);
fr.setSize(200,200);
fr.setBackground(Color.blue);
fr.setLayout(flow);
fr.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
System.out.println("Frame On Line");
MediaLocator ml=new MediaLocator("file:///Windows/ring.wav");
try
{
pl=Manager.createPlayer(ml);
} catch (NoPlayerException e)
{System.out.println("NoPlayerException");}
catch (IOException e) {System.out.println("IOException");}
Button bts=new Button("START");
Button btst=new Button("STOP");
Button btrec=new Button("REC");
System.out.println("Creazione Pulsanti");
fr.add(bts);
fr.add(btst);
fr.add(btrec);
System.out.println("Pulsanti aggiunti al Frame");
bts.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.out.println("Premuto il pulsante START");
StartSound();
}
});
btst.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.out.println("Premuto il pulsante STOP");
StopSound();
}
});
btrec.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.out.println("Premuto il pulsante REC");
Rec();
}
});
}
public void StartSound()
{
pl.start();
}
public void StopSound()
{
pl.stop();
}
}
The application runs on iPAQ where is installed Jeode VM, but
Exception, that i described, is thrown when push START button.
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Index ‹ java-programmer |
- Next
- 1
- 2
- errors within constructorHi I am working on a project and I am getting an error that I do not
understand.
I have the part of the code below along with the line that gives error.
From the exception message I can assume that the object I pass to the
HashMap is a null object but in the code below I create a new object and
initialize it.
I appreciate any advice.
// group IP address
private static final String MULTGRP = "225.4.5.6";
private InetAddress group = InetAddress.getByName(MULTGRP);
private static HashMap mapGroupSocket = null;
// constructor
public IRCServer()throws IOException{
// create sockets for all groups.
MulticastSocket mcastCsci5431 = new MulticastSocket(CSCI5431_PORT);
mcastCsci5431.joinGroup(group);
// other code (not relevant)
mapGroupSocket.put(CSCI5431, mcastCsci5431); <---- exception
thrown.
}
Error:
Exception in thread "main" java.lang.NullPointerException
at IRCServer.<init>(IRCServer.java:91)
at IRCServer.main(IRCServer.java:105)
- 3
- Which executable is used to run Java applets ?When a webpage attempts to run an applet, which executable on my
computer gets launched? Is it "java.exe"?
My reason for this question is that my browser (Mozilla 1.4)
apparently doesn't offer the option to refuse to run Java applets.
So I searched for every occurrence of "java.exe" on my hard-drive
and renamed all of them to something else.
I even re-booted the computer afterwards and then cleared
the browser's cache.
When I went back to a website that runs applets, it took a while
but finally did run the applet, as evidenced by that
familiar coffee-cup icon in the system tray.
So could it be that "java.exe" is not the executable called to run
Java applets? If not, which one would it be?
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
- 4
- Be Honest: Do you implement hashCode(), equals(), and toString() for every class you write?Patricia Shanahan wrote:
[me:]
> > /Anything/ would be better than that. Throw a runtime exception -- at
> > least that would guarantee that you weren't depending on having a
> > working hashCode() without realising it.
>
> It is a functionally correct hashCode.
Only in the minimal sense that it abides by its contract. It not, however,
useable for anything; therefore it only exists (or should only exist) as a
placeholder for a method which the author assumes will not be needed. But
that's a major risk -- sooner or later someone else is likely[*] to start using
these things in HashTables, and then they get poor performance without knowing
why (or perhaps even without realising that they are getting unecessarily poor
performance). If the assumption is that the method is only a placeholder, then
it would be much safer (as I said) to throw an unchecked exception.
If any programmer /I/ worked with was in the habit of leaving these little
timebombs ticking away in the codebase, then I'd be inclined to throw a Very
Serious Wobbly.
What you think of a programmer who habitually wrote:
void toString() { return ""; }
? Yet that's a damn sight safer (and no less "reasonable") than always
returning zero from hashCode().
> I assume that if Mark found poor hash table performance during
> profiling,
As an aside, profiling is not a good tool for recognising or diagnosing poor
hashing functions. And, although it is a reasonable tool for confirming that a
non-too-special hash function is "good enough", even that is somewhat unsafe
unless you know that your test data is representative of real world data /in
the way it interacts with the hash/.
-- chris
[*] "likely" assuming normal operation of Sod's Law.
- 5
- UML Eclipse PluginDoes anyone know a Eclipse plugin that generates a UML diagram out of java code
Thanks
Felix
- 6
- To wrap or not to wrap?Hi,
In my personal development efforts, I frequently wrap basic java
functionality. For example, I have a
String MyIO.urlToString(String url)
or
byte[] MIO.urlToBytes(String url)
etc. These functions catch exceptions and return null if something
goes wrong. I have other functoins that, for example, load database
queries into maps.
My gereneral questions are these. Does everybody pretty much end up
writing convenience wrappers like these for themselves?. If yes, why
aren't utilities like these commonly available as more or less
standard libraries? And if no - why not? Is it a bad idea to use these
and is it for some reason better to, e.g., always form URL's, open
connections, capture exceptions, etc.
Thanks for your opinions!
Aaron
- 7
- Using Netbean IDE for writing/compiling/debugging apps without using ProjectHi
Is there a way to configure Netbean IDE such that it does not insist on
creating a Project everying time I want to use it to
write/compile/debug small Java apps I am writing to learn Java.
I find that default Netbean IDE behaviour to insist on a Project before
I can create a Java file for sample learning applications makes it very
complicated for me as a Java beginner.
Thanks
Bob
- 8
- Easy way to display JSP source on webI need an easy way to display JSP source in a
web page.
If I use..
<jsp:include page="/test/index.jsp" ></jsp:include> or
<%@ include file="/test/index.jsp" %>
..the jsp I want to include is merged with the
original page and (usually) throws exceptions.
Is there any way to include a jsp in a web page
but have it treated as if it were text?
- 9
- advanced Font renderingHello,
from Photoshop I'm used to be able to define the space between two
characters. So I can generate something like
T E X T
without having to put the blanks in there on my own. This setting can
also be used to put the characters closer to each other, so the
characters might be overlapping.
Is there an option in the Font-classes of awt to achieve the same
result? On the one hand I haven't found something yet, but on the other
hand I'm not really sure what to look for.
Regards
Marten
- 10
- newbie scrollbar questionI have a JTextArea wrapped in a JScrollPane, and when I append a line
to the text area
I want the scroll bar to adjust so that the new line is seen in the
viewport. I have
some code that seems to work most of the time, but every once in a
while it does
not work properly. I think I'm probably not doing this the right way.
Here's a code
snippet that shows what I'm doing:
JPanel consolePane = new JPanel();
JTextArea consoleTextArea = new JTextArea(35, 65);
JScrollPane consoleScrollPane = new JScrollPane(consoleTextArea);
JScrollBar vsb = consoleScrollPane.getVerticalScrollBar();
When I want to update the text I do this:
consoleTextArea.append(line);
consoleTextArea.append("\n");
vsb.setMaximum(vsb.getMaximum()+1);
vsb.setValue(vsb.getMaximum()+1);
Seems like there must be an easier way to do this. Is there some
attribute that
I can set that will make this happen automagically?
TIA!
-larry
- 11
- commons and log4j initializing in other web server applicationsThe webserver in my sandbox has about 20 web applications which start
up at runtime.
I'm developing one application in particular.
The web server has classpath which includes a jar file which has a
log4j.properties file.
Several applications up before the one I'm working on.
I can tell that the other applications are finding the log4j.properties
file in the
server classpath - because if I remove it from the jar in the classpath
messages display which warning that log4j hasn't been properly
initialized.
...
My application has a start up servlet the following line of code :
org.apache.log4j.Logger rootLogger =
org.apache.log4j.LogManager.getRootLogger();
rootLogger.setLevel(org.apache.log4j.Level.DEBUG);
The idea is to set the logging level for the application in the start
up servlet.
I'm certain this code gets called. Also, a log4j.properties file and a
log4j.jar
file exists in the application's WEB-INF/lib and WEB-INF/classes
directories.
I have another class in the same application with the line of code :
private static final org.apache.commons.logging.Log LOG =
LogFactory.getLog(JdbcDAO.class);
Note that commons logging is supposed to use log4j when it finds a
log4j.properties file in the classpath.
This LOG variable always has the settings associated with the
log4j.properties
file in the classpath. Or some defaults it sets on it's own when
starting up
with no log4j.properties file.
In other words the code in the start up servlet to set the log level
isn't doing anything.
It appears that there's nothing I can do to initialize the logging
level in my application.
Note that the application this clip of code in the application
weblogic.xml file :
<container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</container-descriptor>
But that hasn't helped here.
Has anyone else ran into this issue and figured out a way to resolve
it?
- 12
- OutOfMemoryException With XML DOMMy project uses XML for its data files and I am using a DOM parser
(the one native to the JDK) to parse out the files. DOM is especially
useful because the project lends itself to the use of trees.
Unfortunately, there tends to be a limit as to how big the XML files
can be before the DOM parser starts chewing up memory and, if the file
is big enough, I get an OutOfMemoryException. It's not from the
project specifically - it's instead a result of the enormous amount of
space DOM takes up.
I was wondering if there's a solution to this? I have read about SAX
a bit, and although it would fix the OOMEx. it would make it more
difficult to manage the tree structure. I could also increase the
amount of RAM available to the JRE, but I'd rather do that as a last
resort.
Does anybody have any other suggestions? Thanks.
- 13
- JSObject leaks on MSJVMMicrosoft have agreed to support the MSJVM until the end of 2007.
Some of our clients may still have the MSJVM on their machines and
their corporate software upgrade policies may not allow them to
replace the MSJVM with the latest one from Sun immediately. This has
created a difficult situation for me. I have one applet which runs
fine on Windows NT/2000/XP/2003 with IE 6/Sun JVM (1.4.2_04) and does
not leak memory. It works fine on Windows NT with IE 5.5/MSJVM 3810.
However, it leaks on Windows 2000/XP/2003 with IE 6/ MSJVM 3810! The
applet calls JSObject.call() and that's where it leaks. I have
replaced the calls with JSObject.eval() but did not improve the
situation. The rate of leak was slow.
I have another similar applet with a different threading model which
does not leak on MSJVM 3810. So I cannot say that JSObject is leaking
on IE 6 regardless.
I know people had similar problems with the Sun JVM 1.3.1 where every
call to JSObject was leaking around 40 bytes. I did not see anyone
complaining about MSJVM though.
Any ideas?
Many thanks in advance.
Pratul
- 14
- JBoss startup exceptionsI am getting exceptions when starting the JBoss server. I believe I
have set the environment up correctly. The webserver brings up the
homepage but I can't get to the jmx-console. Has anyone else had this
problem and is there something obvious I've missed?
I'm running on tru64 unix 4.0f with JDK1.4.2. Trying to install jboss
4.0.2
- 15
- Non-blocking method for reading writing objects to socketsThe methods writeObject and readObject of socket class are blocking
one. i.e. if we create a ObjectInputStream object using
new ObjectInputStream(socket.getInputStream()), the methods blocks
until it gets some stream stuff.
What is the corresponding non-blocking mthod so as to include in
non-blocking programming?
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