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- 2
- Thread.sleep(10000)Is that true Thread.sleep(10000) will make current thread to sleep for
10 seconds?
I cannot use Thread.currentThread().sleep(10000) since sleep is a
static method of Thread. Right? Thread.currentThread() will return a
reference to the currently executing thread object.
- 3
- delete all jvm'sI think I have a corrupt JVM on my machine. I would like to delete all
JVM's and just install the sun JVM. Could anyone tell me how to delete
all JVM's.
Aidy
- 3
- JSP and response object sizeIs there any way to know the size of a JSP (amount of bytes sent in the
response object)?
We need to know the size of the generated JSP when they are sent to the
client. I can only ask for the buffer size... but no the real amount of
bytes sent in the response object.
Any idea???
Thanks in advance
- 4
- Tomcat - Invalid Direct Reference To Login Page ( Workaround help )Hi,
I'm really happy that the "Invalid Direct Reference To Login Page" has
finally been fixed. However I am stuck using Tomcat 4.0.x ( and I
cannot recompile the app-server as it is a managed resource ) , and
the requirement to have a login box included in each page via a panel
is still there.
I've been looking for a workaround. According to the FormAuthenicator
Tomcat code, if the requestURI in the request is NULL, then the
"Invalid Direct Reference To Login Page" error is thrown.
I've written a proxy servlet called LoginProxy. Its job was to alter
the requestURI in the request object before posting to the
j_security_check target.
My login form would post to something like:
LoginProxy?j_username=my&j_password=test&j_forward_uri=/index.jsp
Great, apart from one small problem - HttpServletRequest is READ ONLY.
Damn. I had a look at the actual class heirarchy, and found that
HttpServletRequestFacade was the class that implemented
HttpServletRequest for Tomcat ( I am prepared write Tomcat specific
code, as long as it doesn't involve changing Tomcat itself. ).
HttpServletRequestFacade extends HttpServletRequestImpl, which
implements HttpRequest. HttpRequest does have write access, however
the code:
( ( HttpRequest ) a_Request ).setRequestURI( sForward )
gives a ClassCastException.
My other thought, was - if I just do a sendRedirect ( I was using
forward before ), won't the requestURI be the url of the LoginConfig
servlet.... I could cope with tomcat forwarding me back to the
servlet, I'd just have to add some extra logic. Alas, the request
still retains the null indicating to requestURI.
Can someone tell me how I can modify the request object, or even
create a new one?
Thanks
Ben
- 7
- Parallel PortHello,
I want to drive a device using the parallel port data output.
I want to use preferably an applet to do that. Is that possible?
I heard that javax.comm is not very reliable, does anyone have experience
with it?
thanks,
anwar
- 9
- Can you write to a file from a vector??How do I write to a file (using a FileWriter) from a filled vector??
I.E. Why can't I do this??
for (i = 0; i < myVector.size(); i++){
myWriter.write(myVector.elementAt(i));
myWriter.flush();
myWriter.close();
}
Thanks,
Steve
- 9
- the iPhone Widget List!wow, already many apps / widgets for the iPhone and the thing doesn't
ship for 55ish hours! expect 1000's of these in a few months... they
really make apps on any other mobile phone obsolete!
http://www.iphonewidgetlist.com/
Those guys are sooooo screwed!
Learn how to make them fast, here:
http://webkit.org/blog/?p=87
Check the left side for the tools...
-
- 9
- How to build a class w/ return value?I apologize for a newbie question, but I'm just starting with Java.
I'm trying to write a program which includes a class for checking if a
given text field has a value.
My basic logic would run something like:
A button is pressed
On that event, check if a text field has a value
if it does, return true, else return false.
So, I want to say in the action listener event for that button something
like:
if ( checkValue( txtFieldName ) == true)
do something
else
do something else
I'd then have a public funciton for checking the value
public checkValue( String txtFieldName )
{
if ( txtFieldName == "" )
return false;
else
return true;
}
This keeps giving me an error that a return code is needed for a public
class. If i put void in the class, I can run it but then nothing gets
returned.
Now, a bit of background - I've been doing VB for 12 years, so maybe my
thinking is flawed. If so, is there another way of going about this? I've
googled for the past hour and am very frustrated.
--
kai - email***@***.com - www.perfectreign.com
kai:/> format a:
Error: The DOS concept of formatting disk media is screwed.
To format a floppy, use "fdformat /dev/fd0"
and then "mkfs.minix /dev/fd0".
- 10
- Strange problem with Bluetooth and RFCOMMHi,
I have programmed an application that sends data from a PC to a mobile
phone. This application uses the Bluecove library and a RFCOMM
connection.
When I establish a connection between these two devices and send from
the server (PC) a float number (e.g. 3.12) to the client (mobile
phone), the number is displayed correctly and everything is fine. But
when I want to send 20 float values the following reaches the phone:
3.12
3.12
3.12
3.1199999,
-2.12422343E14
9.707659E-27
9.707659E-27
...
0.0
0.0
...
0.0
These values are changing when sending them multiple times. Sometimes
there are more correct numbers (3.12), sometimes less. And sometimes
the mobile application just crashes without an error.
Probably the reason for that is the data which is not transferred
properly. I tested different ways to transfer the data, e.g. partioning
the data into smaller packets or using DataOutputStream but nothing was
a success.
Snippets of one of my source codes:
/* SERVER */
OutputStream out = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
for (int i = 0; i < 20; i++) {
float f = 3.12f;
dos.writeFloat(f);
}
byte[] rawData = baos.toByteArray();
dos.close();
baos.close();
out = connection.openOutputStream();
out.write(rawData.length >> 8);
out.write(rawData.length & 0xff);
out.write(rawData);
out.flush();
out.close();
connection.close();
/*CLIENT*/
in = connection.openInputStream();
int length = in.read() << 8;
length |= in.read();
byte[] data = new byte[length];
length = 0;
while (length != data.length) {
int n = in.read(data, length, data.length - length);
if (n == -1) {
throw new IOException("Can't read data");
}
length += n;
}
ByteArrayInputStream bais = new ByteArrayInputStream(data);
DataInputStream dis = new DataInputStream(bais);
for (int i = 0; i < 20; i++) {
Log.out(dis.readFloat() + " ");
}
Has anyone an idea how to solve this problem?
Peter Vermeer
- 13
- subclass DeflaterOutputStream just to get bytes written?I am using a deflater output stream, GZIPOutputStream specifically. I
need to know the number of bytes written out by the stream. Obviously
this is not the same number as the number of bytes I have given the
stream. It looks like the only way to get this information is through
the 'def' field, calling getBytesWritten(), or getTotalOut(), depending
on whether I want a long or an int. The problem is that the 'def' field
is protected. So to get this information, I have to subclass
GZIPOutputstream.
Surely, it is fairly common to need this information. Is this a design
flaw, or am I just too stupid to see an easier way to get this information?
Thanks,
~Shea M.
- 14
- Jar: protocol questionI've been using the Jar: protocol a bit in the last few days and I'd like to
know if this is a valid use of that protocol:
jar:file:!/Images/foo.gif
Basically, I'm trying to describe the location of a GIF that a program
should be able to find in one of the various jars that are on the classpath
used by the program.
Since 'this.getClass().getResource()' will search EVERY jar in the classpath
for the desired file, it shouldn't be necessary to specify the jar name.
Therefore, it seems to me that this should be valid notation for indicating
that the jar name isn't necessary in this case: the bang ('!') in the name
following the 'file:' suggests to me that the default jar(s), namely all of
the jars found in the classpath, will be searched for an Images directory
and a file named foo.gif within that directory.
Does that seem reasonable? If not, can anyone suggest a better notation to
use for my situation?
I can't find any discussion of this "special case" in the articles I've seen
about the Jar: protocol.
--
Rhino
---
rhino1 AT sympatico DOT ca
"There are two ways of constructing a software design. One way is to make it
so simple that there are obviously no deficiencies. And the other way is to
make it so complicated that there are no obvious deficiencies." - C.A.R.
Hoare
- 14
- Switching Locale intermittent geometry position bugHi,
I'm working on a 3D visualization of the Mars Exploration Rover
Mission.
Please refer to my webpage:
http://home.comcast.net/~meralizer/
Everything appears to be working well, except I'm still haunted with
what appears to be a Locale/HiResCoord bug.
What makes it more difficult to debug is that it's intermittent!
Sometimes when I switch to a Locale, geometry in the scene/heirarchy
jumps to the wrong position and orientation. However, when I switch to
another Locale and back again, this "fixes" the problem.
So it appears that some information in the transformation heirarchy is
temporarily corrupted. Then when I toggle the Locales, it's is
restored/updated/recalculated to the correct values.
I'm trying to finish this project, but this one remaining bug is
driving me nuts.I'm getting the same bug on two different platforms,
so it's not a platform/grapics card-specific bug.
Any ideas?
thanks
- 14
- java long in an Access databaseHi,
Perhaps this is more of an Access question. I'm discovering that
Access' "Long Integer" cannot store a java Long. So I'm resorting to
string the numbers as strings. I'm I doing the right thing (other than
using Access :) ) or missing someting?
Many thanks in advance!
Aaron Fude
- 14
- Designing presentation-tier for occasionally connected applications.Folks
We are in the process of developing a web-based app that needs to be
functional when the user is on the road where the Internet connection
to the server is not available. There are 3 basic requirements:
1. Must be web-based, not a fat client app.
2. The UI for the offline mode and on-line should be identical.
3. In the off-line mode some basic functionality to enter data (fill
forms) should be available, that do not need to be reentered when the
connectivity is available.
Can some one think of a solution on how one would design this app. To
me disconnect from the network mean no web application, but some one
here insisted that we can put a web-server/appserver on each client
machine (about 200 of these).
Swing based solutions are ruled out because that is not a web-based
architecture.
Any ideas?
Thanks in advance.
Vijay
- 16
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|
| Author |
Message |
Ben
|
 Posted: 2003-12-16 6:43:00 |
Top |
java-programmer, Sound/Midi question
Hi,
I need to extract the outgoing pcm audio data while playing midi.
With the getData() method of a SoundbankResource object,
I can only catch sampled audio data stored in a soundbank.
Is there any way I could catch (well, in real time more or less)
the actual sampled data produced by the synth (channels mixed
or unmixed) ?
Any indications or links welcome. Tx !
Ben
|
| |
|
| |
|
Ben
|
| Posted: 2003-12-16 20:56:00 |
Top |
java-programmer >> Sound/Midi question
Hi,
I need to extract the outgoing pcm audio data while playing midi.
With the getData() method of a SoundbankResource object,
I can only catch sampled audio data stored in a soundbank.
Is there any way I could catch (well, in real time more or less)
the actual sampled data produced by the synth (channels mixed
or unmixed) ?
Any indications or links welcome. Tx !
Ben
|
| |
|
| |
|
Taki
|
| Posted: 2003-12-17 18:37:00 |
Top |
java-programmer >> Sound/Midi question
"Ben" <email***@***.com> wrote in message
news:3fdf0263$0$296$email***@***.com...
> Hi,
>
> I need to extract the outgoing pcm audio data while playing midi.
>
> With the getData() method of a SoundbankResource object,
> I can only catch sampled audio data stored in a soundbank.
>
> Is there any way I could catch (well, in real time more or less)
> the actual sampled data produced by the synth (channels mixed
> or unmixed) ?
Sorry, I can't help you, but I know a magazine that might be able to help u.
Check out Java Developer's Journal Volume:8 Issue:11
There are whole bunch of things about playing back midi, recording etc in
the magazine.
Good luck!
Taki
|
| |
|
| |
|
Ben
|
| Posted: 2003-12-17 20:44:00 |
Top |
java-programmer >> Sound/Midi question
"Taki" :
> Sorry, I can't help you, but I know a magazine that might be able to help u.
> Check out Java Developer's Journal Volume:8 Issue:11
> There are whole bunch of things about playing back midi, recording etc in
> the magazine.
I'll check this out asap ! Thanks for the tip - well, the Graal, I hope ;-)
Ben
|
| |
|
| |
|
Alex Hunsley
|
| Posted: 2003-12-18 0:22:00 |
Top |
java-programmer >> Sound/Midi question
Ben wrote:
> Hi,
>
> I need to extract the outgoing pcm audio data while playing midi.
>
> With the getData() method of a SoundbankResource object,
> I can only catch sampled audio data stored in a soundbank.
>
> Is there any way I could catch (well, in real time more or less)
> the actual sampled data produced by the synth (channels mixed
> or unmixed) ?
>
> Any indications or links welcome. Tx !
>
> Ben
If you're willing to use something outside of java, there's a tool
called Total Recorder (google for it) that lets you record exactly what
you're hearing from your pc.
alex
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Index ‹ java-programmer |
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