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- 1
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- 1
- BufferedReader.readline() behavior with Socketshi !
Here the piece of code that creates my BufferedReader object
--- code ---
Socket socket = new Socket(....);
BufferedReader inSocket =
new BufferedReader(
new InputStreamReader(
m_socketService.getInputStream()));
--- /code ---
My request concerns the method readline() of this object. According to
what I understood of my readings, I expect from this method it blocks
itself until data comes to the socket.
Is that correct? Because in my implementation, this method returns
always null if there is no data to read. So I have to write this
--- code ---
String requete;
if ((requete = inSocket.readLine()) != null)
{
// do something
}
--- /code ---
And that sounds bad to me. It's like an infinite loop...
Thanks a lot for your precious advices.
-o--
- 2
- Problem with weblogic 8.1SP5Hi,
I am deploying my application on bea weblogic 8.1SP5........and it
showing errors below::::
JVMDG217: Dump Handler is Processing OutOfMemory - Please Wait.
JVMDG315: JVM Requesting Heap dump file
.........JVMDG318: Heap dump file written to
/soft_dump/BEA815/user_projects/dom
ains/mydomain/heapdump274442.1150373114.phd
JVMDG303: JVM Requesting Java core file
JVMDG304: Java core file written to
/soft_dump/BEA815/user_projects/domains/mydo
main/javacore274442.1150373147.txt
JVMDG274: Dump Handler has Processed OutOfMemory.
Is dere any solution for it?
Thanks
Samit Katiyar
email***@***.com
- 3
- What is the JMF?I just downloaded the Java Media Framework, but it doesn't make much sense
to me. Is it supposed to be an optional API?
If so, I don't see any demos, javadoc, etc....
The file I downloaded was called jmf-2_1_1e-windows-i586.exe.
--
Josef Garvi
"Reversing desertification through drought tolerant trees"
http://www.eden-foundation.org/
new income - better environment - more food - less poverty
- 3
- uri in taglib jsp while developing witheclipseHi,
I build a new JAVA project using New->project->java project in
eclipse.
I added a new JSP file and would like to know how do i declare the uri
of the taglib file and where i should locate it, since i don't have in
that project the web.xml file.
for example:
<%@ taglib prefix="cs" uri="myDir/myFile" %>
where should myFile be located? or what's the beginning point that it
starts searching the file?
- 3
- Eclipse Plugin- UML Toolbar removalRecently I have uninstalled some Eclipse plug-ins from Eclipse 3.1. These
are from Visual Paradigm and are related with UML Modeling. Though all the
applications have been properly uninstalled from the computer, the toolbars
associated with these plug-ins are still there in the IDE.
How to remove it? How to remove a toolbar from Eclipse?
- 6
- multiple fog nodesI have a scene graph that has a root "world" TreeObject and possibly several children TreeObjects. Each TreeObject includes a BranchGroup and
TransformGroup. Each TreeObject can have a separate translation/rotation and scale applied to it. Note: a TreeObject is _my_ construct.
I have to support transparent switching between parallel and perspecive views. So to get the effect of zooming, I scale instead of translating in z. This keeps the code simpler. (comments?)
I need to add depth cueing and as far as I know, fog is a common way of doing it. Other suggestions are welcome. I have tried pointlight and it seems to have the same issues as fog. Spotlight also seems to have the same issues.
I prefer LinearFog: Exponential fog is less desirable, but acceptable. The contrast for each TreeObject should be optimal: i.e. the front and
back of each TreeObject must be as bright (least fogged) and as dark (most fogged) as possible. In my opinion, this forces us to have multiple fog nodes, one per each TreeObject. Different sizes and shaped for different TreeObjects force this restriction.
The other requirement is that each point on each TreeObject should have the same visibility based on fog whether it is scaled or not.
As far as I know, fog equations work in physical eye coordinates, not in the local coordinates of the TreeObject. If the fog equations work in local coorindates of the TreeObject, fog would be correctly applied in terms of what I want: -
In my application, zooming is implemented by scaling. This has a side effect of making a point behind the center go even further away in terms of eye coordinates, thus causing fog to get thicker. The point in question seems to be getting closer visually because everything gets bigger when you scale; yet it gets murkier because of fog. This effect is visually weird.
Because fog is calculated in physical eye coordinates, I now need compensating logic to undo the conversion to the physical coordinate world.
The compensation would be such that the end effect would be as if the fog equations use TreeObject-local coordinates.
Do you know how to go about doing the compensation? Specifically, what transform(s) should I use to convert: (scale and/or translate) from the virtual world coordinate system to the physical eye coordinate system? I know how to get from my local coordinate system to the virtual world system, but how do I crossover to the physical coordinates system?
Do you know of any helper classes that returns these transformations? I have heard of a ViewInfo object, but I am not sure how to use it and where to get it from. Also, while we are at it, do you know what the co-existence coordinate system is? It seems to be an intermediary coordinate system between the physical world and the virtual world.
Links to good sites/books that talk in detail about these things would also be useful. I suppose these things are similar/exactly the same in
OpenGL (DirectX ???) and any book that describes those would also do?
--
Message posted via http://www.javakb.com
- 6
- Simple Newbie Question? Is This kind of things possible with Java3DHi,
Firts of all, I hope that my English can be understood, I hope so...
I'm very new to Java3D and have been surfing a bit on the net after soms
examples of thing that are possible with Java3D
Now I would like to know if the following is possible.
I would like to know if I can - and how it could be done - to add two simple
beams (rectangles in 3D) to the screen. Can this be done with some simple
xyz-coordainates that I have to give? Because in my final application I
would have to build some model that exists out of multiple beams (not cubes
only, different width, height en depth). I could easyli have the coordinates
of those objects, but is this enough or do I have to knwo some about
clipping (or does Java do that automatically?).
Also, those independant objects could be next to each-other (in 3D). Give
this problems? The only example I have seen so far (that sounds like my
problem) is the colored cube. But my object would have only the frames, I
should be able to look through the objects (damn, don't know the word at the
time...)
So can this be done. Maybe some more experienced people can give me a litlle
bit of code where thera are 2 beams, so that I can see the result, and knwo
if it is possible or not. Ohterwise, I should look for some other
techniques... If the result is acceptable, then I would read a lot of books
of course...
thanks very much
Goethals Frederik
- 6
- 6
- 8
- LASER 2005 Summer School - Software engineering for concurrent and real-time systems-------------------------------------------------------------
LASER Summer School on Software Engineering
Software engineering for concurrent and real-time systems
Elba, Italy
September 11 - 17, 2005
http://se.inf.ethz.ch/laser
-------------------------------------------------------------
Call for Participation
SCOPE AND OBJECTIVES
Research in software engineering of concurrent and real-time systems is
currently making steady progress, too much of which remains unknown to
practictioners. The aim of the LASER school is to distribute the results
of that research to a wider audience and in turn to foster the
appearance of new ideas. The school is intended for both PhD students
and for professional software engineers and managers who want to benefit
from recent advances in concurrent and real-time software technology.
The LASER school is part of an effort to establish a Laboratory for
Applied Software Engineering Research. As the name suggests, the focus
is resolutely practical, although theory is welcome to establish solid
foundations.
The LASER school brings together six of the best experts in the field.
Each of them will present a series of six lectures on his or her latest
research efforts. The speakers for 2005 are: Jayadev Misra (University
of Texas at Austin), Laura K. Dillon (Michigan State University), Amir
Pnueli (New York University and Weizmann Institute of Science), Joseph
Sifakis (VERIMAG and University of Grenoble), Bertrand Meyer (ETH
Zurich) and Wolfgang Pree (University of Salzburg).
The school takes place in the wonderful setting of the Island of Elba,
off the coast of Tuscany, easily reachable through Pisa and Marina di
Campo airports. Along with an intensive scientific program, participants
will have time to enjoy the natural and cultural richness of this
history-laden jewel of the Mediterranean.
LECTURES
"A process-algebra for web computing"
by Jayadev Misra
"Szumo: A Compositional Contract Model for Safe Multi-threaded Applications"
by Laura K. Dillon
"Temporal Verification of Reactive Programs"
by Amir Pnueli
"Component-based Modeling of Real-time Systems"
by Joseph Sifakis
"Object technology for concurrent and real-time programs"
by Bertrand Meyer
"Transparent distribution of real-time software components based on
Logical Execution Time"
by Wolgang Pree
REGISTRATION
Registration is open until May 30th. The number of participants is
strictly limited to ensure quality interaction with the lecturers and
the rest of the audience; all applications must be accompanied by a
letter of recommendation from the applicant's supervisor or manager. A
small number of scholarships are available for participants with
insufficient institutional support.
How to apply?
Use the online registration form available on the LASER website
(http://se.inf.ethz.ch/laser). Deadline for the application is May 30, 2005.
Registration fee
The basic registration fee is EUR 850. Full-time PhD students are
entitled to a discounted price of EUR 500. The registration fee covers
participation in all lectures and other activities of the summer school,
course materials, and excursions.
Accommodation
The accommodation fee is EUR 680 (double occupancy) or EUR 840 (single
room). It includes eight nights in the Hotel Hermitage with breakfasts
and dinners (full board available for additional 160 EUR). Other
expenses such as drinks, telephone etc. will be charged directly by the
hotels. For extra night stays or accompanying persons (subject to
availability of rooms), please contact the school organizers.
Scholarships
A small number of scholarships are available for participants with
insufficient institutional support; they are primarily intended for
students and researchers from developing countries. Participants
applying for such scholarships will be requested to certify that their
institution cannot bear the costs. Each scholarship is EUR 800, covering
a waiver of the PhD student registration fee and EUR 300 towards the
double-occupancy accommodation fee.
WEBSITE AND CONTACT
For all additional information, please visit the website:
http://se.inf.ethz.ch/laser
You can also contact the school organizers at email***@***.com.
Best regards,
Volkan Arslan
- 10
- JPanel sizeI need to get the size of a JPanel so that I can dynamically set the
size of the scrollpane that'll contain it. How do I get the dimensions
of a JPanel before it is actually displayed ??
-snr
- 13
- adding your own styles to Javadoc so that they work automatically?I've managed to get my own styles into the Javadoc
"package.html" file; even though javadoc nukes the
"<head>...</head>" part of the file; this works when
inserted into the _body_ up toward the top, a bit of a
happy surprise to me, I expected it _had_ to go into
the <head>...</head> part:
<style>
span.tbd { font-weight: 700; color: red }
body { background-color: #FFFFFF ; background:
url("http://www.well.com/user/xanthian/images/webback.gif") }
</style>
Well, fine, that's because the original is a *.html
file, making things work fairly naturally.
Things aren't so nice for the *.java files, though.
This definitely does _not_ work at the top of a
*.java file to accomplish the same two style
declarations:
/**
* <style>
* span.tbd { font-weight: 700; color: red }
* body { background-color: #FFFFFF ; background:
url("http://www.well.com/user/xanthian/images/webback.gif") }
* </style>
*/
[Excuse if moronic Google Groups has probably
wrapped the "body" line, that's supposed to be all
one line in both cases.]
Is there some easy way to make this work, so that I
can have my Javadocs pages decorated with my
favorite spiderweb background design, without having
to edit by hand the stylesheet.css that javadoc() emits,
after running javadoc(), _every single time_ I run
javadoc() (which is many times an hour when I'm
working on cleaning up the javadoc output, and so is
an insufferable nuisance)?
IMWTK
xanthian.
- 14
- AppletsHi all,
I'm sure this is old hat to all of you but could someone please tell
me if you can use FileReader to input data into an applet?
I developed this project as an application and am just trying to put
it on my website as an applet but it keeps saying "applet notinited".
I figure it might be because the program needs access to a file
- 14
- Finding help on Events and a small asideHi Guys,
I am writing a java application using lots of visual components. The Java
API help is good in that it tells me about all the constructors, methods and
fields associated with a given object but where can I find similar help on
the events that can be implemented.
I know I can probably just ask my question and get an answer on a group but
I am kind of a self help junkie and I tend to dislike bothering people and
sending excess emails.
And now my small aside
The question arises due to the fact that I want to utilize a JTextField but
only allow integers to be entered and I am looking for the right events to
use to do things like the following.
Any hints or other options would be appreciated
Stop people entering letters or invalid characters via key-presses (probably
a key-press event where I can gobble up erroneous keys but I still need to
allow field tabbing and backspace del etc)
Stop people entering letters via pasting (so switch off CTRL+V etc may
encounter cross platform issues on Mac and Unix)
Thanks Guys,
Eamon
|
| Author |
Message |
shoa
|
 Posted: 2003-7-26 21:22:00 |
Top |
java-programmer, need help with JTabbedPane
Hello all
I have a JTabbedPane with 6 Tabs (each Tab contains a JPanel). I want to
separate them into two groups: put 3 Tabs at the top left and 3 Tabs at
the top right of the JTablePane.
If it is possible, please help
Many thanks
S.Hoa
|
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Index ‹ java-programmer |
- Next
- 1
- java cannot call bat filehi all ,
i have a problem . i am trying to call a bat file from java. When i
test using a exe file. I can call the exe file, but when its a .bat. it
just doesnt seem to work. here is the code:-
File[] fdrives = File.listRoots();
Runtime run = Runtime.getRuntime();
try {
frame.dispose();
JOptionPane.showMessageDialog(null,"Start Installation");
Process
pp=run.exec("D:\\EAServer_v4_Developer\\SilentInstall_Win.bat");
JOptionPane.showMessageDialog(null,"Installation Complete");
}
catch (Exception e) {
JOptionPane.showMessageDialog(null,"Error occured");
}
the location of the bat file is correct. Its a silent installation for
EAServer. Does anyone have any idea how come this happen ? Please help
or advice.
@ could mail me at email***@***.com also. :)
Thanks.
marvin.
- 2
- OT- interesting article in the NY TimesNew York Times
http://www.nytimes.com/2004/01/26/opinion/26HERB.html
----------------------------------------------------------------------
----------
January 26, 2004
OP-ED COLUMNIST
Education Is No Protection
By BOB HERBERT
The conference was held discreetly in the Westin New York hotel in
Times Square last week, and by most accounts it was a great success.
The main objections came from a handful of protesters who stood
outside in a brutally cold wind waving signs that said things
like "Stop Sending Jobs Overseas" and "Put America Back to Work." No
one paid them much attention.
The conference was titled "Offshore Outsourcing: Making the Journey
Work for Your Corporation." Its goal was to bring executives up to
speed on the hot new thing in corporate America, the shipment of
higher-paying white-collar jobs to countries with eager, well-
educated and much lower-paid workers.
"We basically help companies figure out how to offshore I.T.
[information technology] and B.P. [business process functions]," said
Atul Vashistha, the chief executive of NeoIT, a California consulting
firm that co-hosted the conference.
Several big-name corporations had representatives at the conference,
including Procter & Gamble, Motorola, Cisco Systems and Gateway.
Because the outsourcing of white-collar jobs is so controversial and
politically charged (especially in a presidential election year),
there was a marked reluctance among many of the participants to speak
publicly about it. But Mr. Vashistha showed no reluctance. He was
quick to proselytize.
"These companies understand very clearly that this is a very painful
process for their employees and for American jobs in the short term,"
he said. "But they also recognize that if they don't do this, they
will lose more jobs in the future and they won't have an ability to
grow in the future."
He said his firm had helped clients ship about a billion dollars'
worth of projects offshore last year.
Noting that he is an American citizen who was born in India, Mr.
Vashistha said he is convinced that outsourcing will prove to be a
long-term boon to the U.S. economy as well as the economies of the
countries acquiring the exported jobs.
Whether it becomes a boon to the U.S. economy or not, the trend
toward upscale outsourcing is a fact, and it is accelerating. In an
important interview with The San Jose Mercury News last month, the
chief executive of Intel, Craig Barrett, talked about the integration
of India, China and Russia ?with a combined population approaching
three billion ?into the world's economic infrastructure.
"I don't think this has been fully understood by the United States,"
said Mr. Barrett. "If you look at India, China and Russia, they all
have strong education heritages. Even if you discount 90 percent of
the people there as uneducated farmers, you still end up with about
300 million people who are educated. That's bigger than the U.S. work
force."
He said: "The big change today from what's happened over the last 30
years is that it's no longer just low-cost labor that you are looking
at. It's well-educated labor that can do effectively any job that can
be done in the United States."
In Mr. Barrett's view, "Unless you are a plumber, or perhaps a
newspaper reporter, or one of these jobs which is geographically
situated, you can be anywhere in the world and do just about any job."
You want a national security issue? Trust me, this threat to the long-
term U.S. economy is a big one. Why it's not a thunderous issue in
the presidential campaign is beyond me.
Intel has its headquarters in Silicon Valley. A Mercury News
interviewer asked Mr. Barrett what the Valley will look like in three
years. Mr. Barrett said the prospects for job growth were not
good. "Companies can still form in Silicon Valley and be competitive
around the world," he said. "It's just that they are not going to
create jobs in Silicon Valley."
He was then asked, "Aren't we talking about an entire generation of
lowered expectations in the United States for what an individual
entering the job market will be facing?"
"It's tough to come to another conclusion than that," said Mr.
Barrett. "If you see this increased competition for jobs, the
immediate response to competition is lower prices and that's lower
wage rates."
We can grapple with this problem now, and try to develop workable
solutions. Or we can ignore this fire in the basement of the national
economy until it rages out of our control.
E-mail: email***@***.com
- 3
- problem with ListIteratorHello,
I've read about the listiterator. It allows me to traverse the list in
either direction and modify the list during iteration.
But I've tried to add list elements during the iteration and got the
error message.
-- java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:444)
at java.util.AbstractList$Itr.next(AbstractList.java:421)
Is it possible to add the new elements at the end of the list??
Thanks
Lucia
- 4
- tomcat error 500...Hello all, i am trying to load a class file into a JSP page and getting
a few errors...what ive got is a simple form, that reads a username,
password, and submits it to a login.jsp file. my login.jsp looks
like:
<%@ page import="IMASOS.UserInterface" %>
<html><head> ... <body>
<%
String uname=request.getParameter("username");
String passw=request.getParameter("password");
UserInterface ui = new UserInterface();
boolean success = ui.login(uname,passw);
if (success) out.println("<h2>User logged in</h2>");
else out.println("<h2>Login Failure</h2>");
%>
</body>
and the error im getting is...
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
IMASOS.UserInterface.login(UserInterface.java:92)
org.apache.jsp.login_jsp._jspService(org.apache.jsp.login_jsp:50)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
- 5
- Third tapestry tutorial availableHi all,
Tapestry is a web app framework (Java) that allows
your web designers to create and edit web pages using
a WYSIWYG editor (DreamWeaver, FrontPage or etc),
while your programmers can still add dynamic contents
to the pages.
I've created my third Tapestry tutorial. You're welcome
to read it
at http://www2.cpttm.org.mo/cyberlab/softdev/tapestry/
Thanks!
- 6
- 7
- jsp page giving error on tomcat 5Hi
i have written a class for database connection. It has two public
functions connect() which return an object of class Connection and
function close which close the connection
I am using that class in a jsp page to connect to database, but I am
getting an error :
Generated servlet error:
[javac] Compiling 1 source file
/usr/tomcat/work/Catalina/localhost/tpr/org/apache/jsp/web/jsp/index_jsp.java:7:
package db does not exist
import db.*;
^
/usr/tomcat/work/Catalina/localhost/tpr/org/apache/jsp/web/jsp/index_jsp.java:51:
cannot resolve symbol
symbol : variable ibDriverTest
location: class org.apache.jsp.web.jsp.index_jsp
Connection con = ibDriverTest.connect();
......
The class is in the package db. Can you please tell why is import db.*
not working.
Thanks is advance
Lalit
- 8
- Why no compiler-warning at invalid array-initializing ?I was wondering, why doesn't the java-compiler warn
for incorrect initializing of arrays, for example :
int[] myArray = new int[2];
myArray[3] = 1; // Runtime-error : ArrayIndexOutOfBoundsException.
Isn't it very easy for the compiler to detect this
kind of invalid code ?
- 9
- JDK 1.5 metadata feature docs?Hi all,
Has anyone come across documentation that thoroughly describes metadata
functionality that will be available in JDK 1.5? I only saw some brief
examples of what it's supposed to do, and I downloaded JDK, but I can't find
any docs. Any pointers?
- 10
- how to get total number of rows contained in a resultsetHi friends
how to get the number of rows contained in filteredrowset or a simple
resultset.
Thanx in advance
praveen
--
praveen homkar
Message posted via JavaKB.com
http://www.javakb.com/Uwe/Forums.aspx/java-general/200508/1
- 11
- XML Processing Approaches with JavaWhen I want to manipulate and retrieve data from XML file,
I used to use DOM or SAX, and this is JAXP API from Sun.
Some people told me I should use XPath instead, since it's easier for coding.
But we need to use apache's xalan library.
What do u think? please advise. thanks!!
- 12
- status bar ticking forwardHi,
I am using a servlet application which when I call up a certain page,
the status bar just keeps on ticking forward, you know the progress
bar at the bottom of the screen.
This is happening only on one page. I am doing nothing differnt to
this page that I think would cause this. Any ideas?
Thanks.
TP
- 13
- finding total number of bytes an object takes upGiven an object of a Java class, is there some straightforward way to
find out how many bytes of memory it takes up?
In C there exists a <sizeof()> operator, but even if it had a counter-
part in Java (which doesn't appear to be the case) that wouldn't be
exactly what I want because the objects I want to know the sizes of
contain references to objects of other classes, and I need to know the
_total_ bytes taken up by that object, its components, its components'
components, and so on. Can anybody point me to how I can find this
out? Any information would be greatly appreciated.
---Kevin Simonson
"You'll never get to heaven, or even to LA,
if you don't believe there's a way."
from _Why Not_
- 14
- What's the point?Here's some thoughts from a Java guy at JavaOne:
http://beust.com/weblog/archives/000388.html
As JavaOne 2006 opens its doors today, the age-old question is bound
to be asked again and again: will Sun open source Java?
I have a fairly straightforward answer: I don't care.
And I suppose that most of the Java developers out there don't care
either.
What exactly is not open source in the Java we use today? I had to
think hard to answer this question because, frankly, everything I need
on a daily
basis is already available in source form, with one exception: the
Java Virtual Machine.
Sun's JVM (and others) is admittedly very good and I'm sure a lot of
developers would be interested in knowing how it works, but let's face
it: the inner workings of a Java Virtual Machine are completely
irrelevant to
most Java developers and not having access to this resource will
probably
never get in the way of writing Java code.
With that in mind, why is the question of open sourcing coming back so
often?
One word: zealotry.
*Posted from the Opera Mini Java browser on my Nokia 9300.
- 15
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