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Index ‹ java-programmer
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- 2
- Problem with table nameHi!
I have a problem to access tables in an Informix Database. Table names
are something like that :
informix.pv_tvvte
When I try a "SELECT informix.pv_tvvte.numero_vente FROM
informix.pv_tvvte WHERE informix.pv_tvvte.numero_vente=#value#", (I use
ibatis and spring) I get a syntax error exception (SQLException "Bad SQL
Grammar").
If I replace dot with "_" in the name, I get a "Table Not Found" Exception.
How could I escape the dot in the tables names ?
TIA
Arnaud
- 3
- Eclipse : JCE problemHi,
I have this exception when I launched an application from Eclipse 2.1.
java.security.NoSuchProviderException: JCE cannot authenticate the provider
SunJCE java.lang.NullPointerException
at javax.crypto.SunJCE_b.a(DashoA6275)
at javax.crypto.SunJCE_b.a(DashoA6275)
at javax.crypto.SecretKeyFactory.getInstance(DashoA6275)
at
cms.security.SecurityConfiguration.getSecretKeyFactory(SecurityConfiguration
.java:196)
at
cms.kms.PBEKeyHandlingService.loadValuesFromSecurityConfig(PBEKeyHandlingSer
vice.java:276)
at
cms.kms.PBEKeyHandlingService.<init>(PBEKeyHandlingService.java:114)
at cms.backend.JCECryptoService.<init>(JCECryptoService.java:129)
at services.CryptoService.<init>(CryptoService.java:68)
...
I'm using JDK ver. 1.4.0. I'm have replaced local_policy.jar and
US_export_policy.jar with an unlimited strength version.
However, this exeception is NOT thrown when I launched the same application from
command line. It only happen when I executed it inside Eclipse environment.
Any advice?
TQ
/lim/
- 3
- lose request focushello
I have some buttons on my UI and a textfield.
when the user dont click one of my buttons the focus from the textfiled
is lost
how solve this?
in onEvent(Event event)
{
if(event.target==button1)
do something
else if(event.target==button)
..........
like this is going......
what should I add to the method to catch the event(click somewhere in
UI,but not in my object(buttons......)) properly?
- 5
- The solutions are very OS specific.Hi Mark Thornton,
You wrote,
" The rough equivalent to an HDC is
a java.awt.Graphics object,
extended ( since Java 1.2 ) to java.awt.Graphics2D.
These are used for drawing to screens, printers
or into a BufferedImage. "
That's quit impressive,
But my bank simulation currently requires Excel,
which precludes Linux.
Also, if I ever moved my simulations to Direct Draw 7,
or even Direct 3D 9 ( instead of the GDI )
once again I'd be forced to use C++,
as DD7's interaction with MS windows is very tricky
and very OS specific.
For example,
Windows' taskbar hoards it's mouse messages.
The taskbar also turns on the system cursor,
which blocks VRAM-to-VRAM blts.
The solutions are very OS specific.
Would the bankers pay for that ? I doubt it.
- 5
- compression API available in Java & C++?Apologies if this is slightly off-topic ...
I'm looking for a compression algorithm that works better than gzip
for small (12 bytes or so) chunks of data. Ideally there would be a
free implementation for Java and C++ that we could use for commercial
purposes.
Specifically, we are streaming data from a C++ server to a Java applet
and would love to use as little bandwidth as possible.
We're not using any form of compression right now, but the belief is
that gzip works in blocks, so small chunks of data don't get much
benefit. (Anyone disagree?)
--
monique
Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html
- 7
- Basic FreeBSD Java/Tomcat questionsHello, all=2E I'm an old hand with Java but relatively inexperienced with=
FreeBSD, and I've never run Java there until the last few days=2E I had a=
few things I was wondering about=2E I can't find these things in the
archives, and don't know where else to look=2E Some of my questions might=
betray my lack of FreeBSD knowledge =2E=2E=2E
My preferences:
1=2E Avoid customization to the extent possible -- I don't really want to=
spend much energy being an admin -- even if my configuration is not
optimally flexible, or whatever=2E This means I'd prefer to use packages
from 5=2E4-RELEASE as opposed to ports, etc=2E
2=2E Not to have to build full JDK (with web start, plugins, etc=2E) --
building minimal took days as it was=2E
3=2E Simplest system possible, fewest installs possible, ease of
administration/use=2E
Here's what I've done so far:
1=2E Installed FreeBSD 5=2E4-RELEASE (minimal distribution set only)
2=2E Built jdk-minimal-1=2E4=2E2p7 from source on test machine=2E Seemed=
to go
fine=2E Created package using pkg=5Fcreate -b =2E=2E=2E
3=2E Installed jdk-minimal-1=2E4=2E2p7 as package=2E java -version works=
; haven't
tried much else, except =2E=2E=2E
4=2E jakarta-tomcat-5=2E0=2E30 as package WITHOUT its dependencies (i=2Ee=
=2E,
pkg=5Fadd -r from my own server, which does not have the fonts stuff on it=
)=2E=20
Besides emitting the predicatable complaints about missing dependencies,
the pkg=5Fadd command emits a warning saying the jdk package is required a=
nd
I have jdk-minimal=2E
5=2E Tomcat post-install
cp conf/server-minimal=2Exml=2Esample to conf/server=2Exml
cp conf/web=2Exml=2Esample to conf/web=2Exml
chown www conf/*=2Exml
/usr/local/etc/rc=2Ed/020* start
What happens:
It works, so far as I can tell=2E This means that I've gone to the home
page, not tested extensively=2E The 'balancer' webapp doesn't initialize
correctly (fails with NoClassDefFoundError on
org=2Eapache=2Ecommons=2Edigester=2EDigester) but I'm not too worried abou=
t that
since I don't know exactly what it's for and I haven't read any docs yet=2E=
Questions:
1=2E Why does Tomcat depend on all the font stuff=3F Can I safely run wi=
thout
it=3F
2=2E Same question with the jdk vs=2E jdk-minimal issue=2E
3=2E What are the limitations of tomcat50ctl=3F I've seen some messages =
in
the archives saying I'll need to change my /usr/local/etc/rc=2Ed script if=
I
want to do things like command-line arguments to Tomcat, etc=2E
Comments:
I'm really pleased (as I've worked through these issues) about how smart=20=
the packaging system is (e=2Eg=2E, not deleting files if they've been chan=
ged)=2E
Not sure to what extent credit is due FreeBSD developers and to what exten=
t
credit is due to people on this list, but take whatever you're entitled to=
=2E
:)
Special praise for the jdk14 port -- for such a complex build, I'm shocked=
how well it worked for me, particularly since I know very little about mak=
e=2E
Cheers,
-- David=2E
--------------------------------------------------------------------
mail2web - Check your email from the web at
http://mail2web=2Ecom/ =2E
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
- 9
- Reading an array of byte with special delimiter....help me!!Hi guys,
i've developed a java application that has in input a txt file with a
standard format
string string string
string double double
string double double
and stores it into an array of byte with a fixed format,
that is
byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)
that mean introducing byte whitespace value and byte ; value to
separate different columns and different rows.
Now i have to develop inverse routine,that has to read the array of
byte and rebuild its original format.
Can you help me with some idea ord code?
I'm inexepert...please help me with clear suggest...
I post you my routine that converts txt file into an array of byte
P.S.In my txt file number of columns and rows change for each file,what
is standard is a firtst headline that is an array of string and others
row with the same format string array of doubles....
[code]public byte[] getBytes(){
byte middlerow=' ';
byte endrow=';';
Vector temp=new Vector(10000000);
int i=0;
String g=null;
Riga r;
Double val[];
while(i<intest.length){
//copio tutto nell'array di byte
byte []bytes = intest[i].getBytes();
// memorizza in byte un elemento del vettore alla volta
for( Byte aByte : bytes ) {
temp.addElement( aByte );
}
temp.addElement( Byte.valueOf( middlerow ) );
i++;
}
temp.addElement(Byte.valueOf(endrow));
System.out.println("Intestazione convertita in byte");
for(int l=0;l<rows.size()-1;l++){
r=(Riga)rows.get(l);
g=r.getgeneid();
temp.addElement(g.getBytes());
temp.addElement(Byte.valueOf(middlerow));
val=r.getvalues();
for(int e=0;e<=val.length-1;e++){
temp.addElement(Byte.valueOf(val[e].byteValue()));
//val[e].byteValue() fa il casting double in byte
temp.addElement(Byte.valueOf(middlerow));
}
temp.addElement(Byte.valueOf(endrow));
}
byte [] b=new byte[temp.size()];
for (int k=0;i<temp.size();i++){
b[k]=(((Byte)temp.elementAt(k)).byteValue());
}
return b;
}[/code]
Thanks for your help...
- 9
- queue management with "application failure management"hi,
I am looking for something which looks like the message queue of the IPC
systemV with java.
my requirements are:
-management of a queue. one application adds data in this queue and
another gets data from this queue.
-simple : no server like JMS. (btw if you know some JMS implementation
without a server it could be what I want). could be in a file.
-no data lost if one application crashes. ie if the application which
gets data from the queue crashes, the other can continue to add data to
this queue and the processing will continue without losing data once the
crashed application is restarted.
do somebody know some libs which implements this?
thanks.
- 9
- Watch NFL Games OnlineWatch NFL Games Online!
For every one who wants to watch the games online because they dont live in the teams town or are at work i found a site that has basically every game covered. Its perfect if you have afford a monthly $70 direct tv nfl access subscription. they got a bunch of channels
The sites http://nflonline.wizhoo.com
- 10
- recognizing java processesHow would you recognize a java process (as java process) in runtime
from outside the JVM? (win32)
is there a nicer way than monitorizing DLL loads in order to detect
the jvm.dll/javai.dll load?
- 13
- java.net SocketPermissionHi,
I am getting the SocketPermission deny error when I trying to run my
applet on the net. When I was running stand along, embed in the frame,
on my local PC, it was no problem. Help!!!
eric
- 13
- to whom it may concern
"pcbutts1" <email***@***.com> wrote in message
news:4e23e9d12ed44ede9a25a80dde27d810@erollscom...
>
> You don't, by any chance, have a tape recorder?
>
No. But I do own a shovel. I also own several high powered rifles and I'm
very proficient in using them. Capisce?
- 13
- I miss my preprocessor!There's one thing I really used the C/C++ preprocessor for, and that is
compile-time control of debugging statements.
in it's simplest form:
----------------------------------------------
// comment out this line to disable debugs
#define DEBUG 1
#ifdef DEBUG
# define dbg(msg) printf(msg)
#else
# define dbg(msg)
#endif
void main(int argc, char argv[][])
{
dbg("Some sorta message\n");
}
----------------------------------------------
This system had evolved to a very powerful mechanism for
enabling/disabling/removing debug statements from my code. The beauty of it
is that debugging code can be removed
entirely from released code, without removing from the source. (I like
leaving it in the source because it provides a sort of ancillary
documentation). The only shortcoming was the lack of variable macro
parameters in C/C++.
The nearest I could come up with in java is:
----------------------------------------------
class xxx
{
private static final boolean DEBUG=true; // set to false to turn
off debugging
void dbg(String msg)
{
if (DEBUG) // this gets optimized out
System.out.print(msg);
}
public static void main( String[] args )
{
if (DEBUG) dbg("Some sorta message\n");
}
} // xxx
----------------------------------------------
While this does seem to work, it relies on the compiler to implicitly
optimize the code out. Not that I don't trust the compiler, but how can I
prove it?
From an aesthetic point of view, the "if (DEBUG)" part seems to clutter up
the source.
And it leaves a stub for dbg() in the code.
My point is, what options are available to reproduce the desired mechanism?
(Don't give me anything from java 1.5/5.0; I can't use it till it is
officially released, and the major ide manufactures endorse it).
regards,
Dar7yl (the 7 is silent)
- 14
- java.util.regex - combining paragraphs separated by blank lineI need to write a regular expression to group lines of text separated
by a blank line.
Ex.
Input:
line1
line2
line3
line 4
line 5
line 6
I tried turning on the MULTILINE and DOTALL flags and used the
following pattern:
(.+?)^$
which is close but prepends a newline to the 2nd and subsequent calls
to Matcher.find().
The first line of every paragraph is the same, if that helps.
Regex's are cool, but frustrating....
- 15
- HTML Parser Help PleaseHi
I am using HTMLEditorKit.Parser class to parse a HTML file. However, I have
found this Swing HTML parser extremely difficult to use.
I am trying to parse a HTML file and extracting specific information from it
into a table. Consider the snippet of my HTML and the table I like it to
generate:
HTML source:
<HTML>
<TITLE></TITLE>
<BODY>
<PRE>
Identifer: ABCDEFG
</PRE>
data: 123456
<PRE>
</PRE>
</BODY>
</HTML>
TABLE:
ABCDEFG 123456
Here is the code I have so far:
import javax.swing.text.*;
import javax.swing.text.html.*;
import java.io.*;
public class HTMLParser extends HTMLEditorKit
{
public HTMLEditorKit.Parser getParser()
{
return super.getParser();
}
public static void main (String[] args)
{
try
{
Reader r = new FileReader("html_file.html");
HTMLEditor.Parser parse = new HTMLParser.getParser()
HTMLEditorKit.ParserCallback cb =
{
public void handleStartTag(HTML.Tag t, MutableAttributeSet
a, int a)
{
if (t==HTML.Tag.PRE)
{
//print whats between the pre tag
}
}
public void handleText(char[] data, int pos)
{
//print whats between the pre tags
}
};
parse.parse(r, cb, true);
}
catch (IOException e)
{
System.out.println(e);
}
}
}
I would appreciate it very much if someone could solve this problem for me.
I tried the sun tutortial, but the examples aren't that clear enough for me.
Thanks
ZOCOR
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.760 / Virus Database: 509 - Release Date: 10/09/2004
|
| Author |
Message |
sent1729
|
 Posted: 2006-2-23 21:49:00 |
Top |
java-programmer, Progress bar in JDialog
Hi all,
I am a new beginner to Java Programming. In my application I am loading
an xml doc in JFrame, while doc is loading I would like to see a
progress bar above the J frame.
This is what I did:
I created a modal JDialog with a progress bar, to be able to show the
dialog above the frame. But if I do that then it freezes the loading of
the xml doc in my Jframe. In other words, only after I close the
JDialog I am able to load the document in my JFrame. Hence, the whole
point of showing a progress bar while loading the document is missed.
How to get over this problem. Can anyone please help.
Any input is greatly appreciated.
Thanks
Nathan
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Chris Smith
|
| Posted: 2006-2-23 22:09:00 |
Top |
java-programmer >> Progress bar in JDialog
<email***@***.com> wrote:
> This is what I did:
>
> I created a modal JDialog with a progress bar, to be able to show the
> dialog above the frame. But if I do that then it freezes the loading of
> the xml doc in my Jframe. In other words, only after I close the
> JDialog I am able to load the document in my JFrame. Hence, the whole
> point of showing a progress bar while loading the document is missed.
>
> How to get over this problem. Can anyone please help.
If you want to perform long-running tasks in a GUI application, you must
create a new thread to do so. This is true regardless of whether you
use a JProgressBar or not. Simply create and start your new thread
before showing the modal dialog box from the AWT Event Dispatch Thread.
(As always, then, you need to use EventQueue.invokeLater to perform any
GUI work, including updating the value of the progress bar.)
--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.
Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation
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Thomas Weidenfeller
|
| Posted: 2006-2-24 0:01:00 |
Top |
java-programmer >> Progress bar in JDialog
email***@***.com wrote:
> I created a modal JDialog with a progress bar, to be able to show the
> dialog above the frame. But if I do that then it freezes the loading of
> the xml doc in my Jframe. In other words, only after I close the
> JDialog I am able to load the document in my JFrame. Hence, the whole
> point of showing a progress bar while loading the document is missed.
See the list of the Top 5 questions in the comp.lang.java.gui FAQ. And
don't forget to start reading Sun's GUI and threading tutorials.
/Thomas
--
The comp.lang.java.gui FAQ:
ftp://ftp.cs.uu.nl/pub/NEWS.ANSWERS/computer-lang/java/gui/faq
http://www.uni-giessen.de/faq/archiv/computer-lang.java.gui.faq/
|
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steve
|
| Posted: 2006-2-24 18:39:00 |
Top |
java-programmer >> Progress bar in JDialog
On Thu, 23 Feb 2006 21:49:26 +0800, email***@***.com wrote
(in article <email***@***.com>):
> Hi all,
>
> I am a new beginner to Java Programming. In my application I am loading
> an xml doc in JFrame, while doc is loading I would like to see a
> progress bar above the J frame.
>
> This is what I did:
>
> I created a modal JDialog with a progress bar, to be able to show the
> dialog above the frame. But if I do that then it freezes the loading of
> the xml doc in my Jframe. In other words, only after I close the
> JDialog I am able to load the document in my JFrame. Hence, the whole
> point of showing a progress bar while loading the document is missed.
>
> How to get over this problem. Can anyone please help.
>
> Any input is greatly appreciated.
>
> Thanks
> Nathan
>
welcome to threading.
you also need to ensure you start your gui in the "right" thread, which most
people don't do.
I.E don't just crash aimlessly straight thru your main and into the
xxx.visible(true);
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steve
|
| Posted: 2006-2-24 18:40:00 |
Top |
java-programmer >> Progress bar in JDialog
On Thu, 23 Feb 2006 21:49:26 +0800, email***@***.com wrote
(in article <email***@***.com>):
> Hi all,
>
> I am a new beginner to Java Programming. In my application I am loading
> an xml doc in JFrame, while doc is loading I would like to see a
> progress bar above the J frame.
>
> This is what I did:
>
> I created a modal JDialog with a progress bar, to be able to show the
> dialog above the frame. But if I do that then it freezes the loading of
> the xml doc in my Jframe. In other words, only after I close the
> JDialog I am able to load the document in my JFrame. Hence, the whole
> point of showing a progress bar while loading the document is missed.
>
> How to get over this problem. Can anyone please help.
>
> Any input is greatly appreciated.
>
> Thanks
> Nathan
>
sorry i forgot the link
http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html
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Index ‹ java-programmer |
- Next
- 1
- but *very* apropos] Future reuse of codeLOL!
I enjoyed reading that...
I think "Nihil Software" was a bit of a giveaway... Maybe some of my posts
in the 90s inspired the author <G>.
I hasten to add that this is NOT what we were intending to do with Dulcinea.
Natural language interfaces are not SO hard to write (I wrote one for MS-DOS
that allowed people who didn't like the command line to communicate in
English.) It was distributed by a computer vendor in North Sydney as an
incentive to buy machines from him. He paid me $10 for every machine he sold
with it on...(It was called "IGOR" - Interactive Guide to On-line Running
<G>.) I did it because someone said it couldn't be done, and wasn't really
interested in it as a money maker.
He sold several hundred machines with it on, before Windows 3.1 came out and
blew it all away.... I received mail from people up to 2 years afterwards
saying how much they liked it. (If they asked IGOR about his life he would
give them my e-mail address, as well as an amusing tale of how he escaped
from Frankenstein's lab <G>)
The concept engine would have used a similar Natural Language simulation for
interaction with the User, but it would have no UNDERSTANDING of what the
language meant (apart from keywords which it would act upon).
Nowadays of course, there are some very good Natural Language interfaces and
they are quantum leaps beyond IGOR.
Don't let the fact that a magazine caught you with a hoax, persuade you that
such software will never be developed.
Thanks for posting it, John.
Pete.
"jce" <email***@***.com> wrote in message
news:XOkYa.17847$email***@***.com...
> Here is a classic gotcha from Software Development magazine that I
consider
> appropriate enough to consider sharing.. you are fortunate enough to have
a
> disclaimer on the online version...those of us who read this back then
(and
> are gullible) actually believed it for a moment :-)
>
> http://www.sdmagazine.com/documents/s=819/sdm0204f/
>
> You may have to register but you can make up a name...you could sign up
for
> the free magazine (maybe not in nz) but it's a pretty interesting magazine
> that doesn't take long to flip through.
>
> Here's the intro:
> Once every decade or so, a technology comes along that changes the
software
> landscape, becoming an indispensable part of the developer's life.
Although
> just about every new software concept touts itself as something that will
> "change the way we work," only a handful truly possess such far-reaching
> consequences. One key advance in our field was object-oriented
programming.
> Another is the increasing level of abstraction in the tools that
developers
> use. What shape might the next advance take?
>
> The R&D folks at Nihil Software believe they have the answer. Their
> innovation is called Natural Language Design (NLD), an approach that
enables
> rapid construction of complex software systems using natural (spoken or
> written) language to specify the program. Using this approach, and the
> accompanying tools that Nihil has provided as reference implementations,
you
> can verbally describe the system you want to build and literally see it
> constructed as you speak. That's right, you heard me, no programming.
> Skeptical? Read on.
>
> John (jce)
>
> "Peter E.C. Dashwood" <email***@***.com> wrote in message
> news:email***@***.com...
> > TOP Post only.
> >
> > Dennis,
> >
> > I have believed for some years now that the lack of ARTIFICIAL
> intelligence
> > to generate systems can be compensated for (until it actually arrives
> around
> > 2020...<G>) by putting a Human (or Humans) in the loop.
> >
> > This was revealed to me in a blinding flash of insight (kind of like
Saul
> > on the road to Damascus <G>) when I was trying some new approaches to
> > Project Management and instigated some RAD type workshops. The keys are
> > INTERACTION and ITERATION. Do something, look at it, discuss it,
evaluate
> > it, change it, look at it again and repeat this process for a finite
> period
> > of time or until the desired goal is attained.
>
>
- 2
- JScrollPaneI have a file displayed in a JTextArea which is in a JScrollPane. When the
window appears, the scroll bar is all the way down, displaying the end of
the file. How can I set it to have the JScrollPane scrolled up to display
the beginning of the file?
_______
Nechama Shuchatowitz
email***@***.com
- 3
- Trouble with KeyListeners in 1.4.2I'm having trouble using KeyListeners in 1.4.2. I'm writing a graphics
application, and I'd like to change the behavior of some of the tools when
modifier keys are held down. The problem is that I use a JToolBar, which
seems to have grabbed hold of the focus and won't let go. The KeyListener
I've registered with the main JFrame doesn't pick up any events (unless I
comment out the JToolBar).
I found a fix on the boards at java.sun.com which involves registering a
KeyEventDispatcher with the current KeyboardFocusManager, and that does
allow my KeyListener to work, but any *other* KeyEvents fail to propagate
further--i.e., alt-F4 no longer quits the app, the alt-keys for my menu
mnemonics stop working, etc.
What do I have to do to get both shift-key detection and other key commands
working at the same time? I understand there were some changes to the focus
system in 1.4.x that cause these problems, but there doesn't seem to be any
documentation on how to work around them.
Any help is much appreciated.
BTW, here's the code for the KeyEventDispatcher, in case it helps:
DefaultKeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDisp
atcher(
new KeyEventDispatcher() {
public boolean dispatchKeyEvent(final KeyEvent e) {
processKeyEvent(e);
return true;
} // dispatchKeyEvent
} // KeyEventDispatcher constructor
);
--
Aaron Davies
email***@***.com
- 4
- Reverse order using Struts iterate tag"Bob" <email***@***.com> wrote
> I am fairly new to struts. Is it possible to iterate backward through
> a collection when using the struts iterate tag? We would like to list
> the values in reverse order on the page.
Yes, I've got things listing in reverse date order in my own Struts webapp.
However, I don't think this has anything to do with Struts. <logic:iterate>
and <c:forEach> are going to return the items in whatever order they come
out of the Iterator returned by the Collection's iterator() method.
To make things sort "backwards", you can override the 'compareTo' method
(and probably equals and hashCode, to be completely correct) on the class of
the objects in your collection. Then call Collections.sort with your
Collection. (I think you can also use a Comparator instead of overriding
compareTo, but that's not how I did it. Actually, looking through my code I
think I may have sorted these on the database side before returning the data
to the DAO! But it's still possible.)
Then when you get to the JSP the logic:iterate tag should display things in
reverse order.
Can you post the JSP and let us know what type of objects you have in your
Collection?
--
Wendy in Chandler, AZ
- 5
- references and a binary treeHello,
I am new to Java. I am filling a binary tree with values using a loop,
so when I need to descend one node deeper at the end of the loop, I
use node=node.right for example. Consider this pseudo code:
//...
while(1) {
node=new Node(new Leaf(),null);
node=node.right;
}
I thought that the node variable will contain reference after this
operation. But it does not, because when I look at the root of the
binary tree, it does not get filled any further after the
node=node.right operation.
So my question is, what actually happens in the node=node.right , I
tought that it should be only copying the references, not the values.
I coded the same in c++ and instead of references I used the pointers
and it worked right as I expected.
- 6
- not getting an error but this code is not working properly.this code is to delete a record from an access database.there is no
error but the record is not getting deleted from database.
please help me in this regard.
thanks in advance.
code:
if(JTCurrentJobTable.getValueAtJTCurrentJobTable.getSelectedRow),JTCurrentJobTable.getSelectedColumn())
!= null){String ObjButtons[] = {"Yes","No"};
int PromptResult = JOptionPane.showOptionDialog(null,"Are you sure you
want to delete the selected record?","Delete
Record",JOptionPane.DEFAULT_OPTION,JOptionPane.ERROR_MESSAGE,null,ObjButtons,ObjButtons[1]);
if(PromptResult==0){stCurrentJob.execute("DELETE * FROM
tblCurrentJob WHERE CurrentJobIndex= " +
JTCurrentJobTable.getValueAt(JTCurrentJobTable.getSelectedRow(),0));
reloadRecord();
JOptionPane.showMessageDialog(null,"Record has been successfully
deleted.","Comfirm Delete",JOptionPane.INFORMATION_MESSAGE);
}
- 7
- JMF Manager.createDataSource() and Resource URLsCurrently I am getting a URL from Class.getResource() for a wav file in
the same directory.
So here is what happens:
If I feed Manager.createDataSource from JMF the Resource URL it fails
and says unable to locate Data Source
If I feed Manager.createDataSource a url to a webserver with the same
file it works fine.
How can I work around this?
Dan
- 8
- ant inherifRefs & echo for variablesHi! I'd like to see what ant thinks a variable value is.
<echo>${varname}</echo> just shows me the literal '${varame}'. I was
hoping there was some way to resolve it.
The reason I want to do this is that delegate build.xml's don't seem to
be inheriting refs
<ant dir="subfolder" inheritAll="false" inheritRefs="true"/> doesn't
seem to be working for me. I'm trying to pass a class path down to the
build file that actually compiles. Is this possible? Is there a common
pitfall I'm probably falling into?
- 9
- Tomcat and Connection HandlingHi,
I have noticed that when you do not return from the doGet() or doPost()
method, for example, by inserting a infinite while loop like this:
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException
{
while(true);
}
that tomcat will run out of connections after a few requests. So it
seems to me, that tomcat is only using a few threads to serve many many
http requests.
Is there any way that I can make sure, that each doGet() and doPost()
will be handle by a dedicated thread?
The problem I'm trying to solve is to keep up to 1000 http connections
alive over a long period of time and to sent information to the clients
once in a while.
I have solved this with basic thread blocking and waiting on objects,
but the problem is that tomcat runs out of threads, because there seems
to be a limited amount of threads, which tomcat uses to serve its http
requests.
any advice is appreciated!
fritz
- 10
- relative paths for properties files in a web appI want to plug an API in to a web app. The API has a properties file
that has properties defining the relative location of particular
files. The questions I have are
1. where should I store such 'particular files', indeed including the
properties file itself - should I manually load them in to the WEB-INF
directory?
and
2. how do I relatively relate to the path of the files located inside
the web app (for example in the WEB-INF) inside the properties file.
I hope that makese sense.
Thanks
- 11
- Can I create a Thread directlyHI,
Can I create a thread directly and then start it and run it as the code below?
Thread tt = new Thread(); (or Thread tt = new Thread("thread");)
tt.start();
tt.run();
If this is not possible, what is the use of these two methods?
- 12
- 13
- JTable select problemHello,
I have a great problem with my JTable. I have a JTable with few lines
and two columns. The user can select one line and with the following
statements
int column = tblSearchResults.getSelectedColumn();
int row = tblSearchResults.getSelectedRow();
Object value = tblSearchResults.getValueAt(row,column);
I retrieve the value with which I display details of a second line in a
new window (when the user presses a certain button). The problem is
when I close this new window and want to select a new line the
getSelectedColumn and the getSelectedRow returns always -1 which
says that no line is marked although I have marked a line.
Does anybody know what the problem can be? - it must concern the open
and close of the detail window, because when I omit the code line which
opens the detail window and only make System.out.println's with the
getSelectedColumn and getSelectedRow it will always output the right
line...
thx
pat
- 14
- Focus problem on JListHello,
I made a JDialog with two JButton and one JList. I'd like to get the focus
on my Jlist, but it's always the first button (in declaration order) which
has the focus. An actionListener is added to the JButton and I put the focus
on the Jlist by "JList.requestFocus()".
Any idea ?
- 15
- My app runs too slow (lots of code follows)Let me start out by saying that I'm admittedly not a great programmer.
I'm sure that my problems are my own fault and not really Java's. I
have a program that I had originally written in Perl. For various
reasons I decided to rewrite it in Java, but now that I'm nearly done,
I'm not sure if I want to use it because it's very slow and resource
intensive compared to my Perl version.
Quick summary of what the program does: it performs MD5 sums on a
number of files, stores the sums and compares against them on future
runs -- sort of a cheesy tripwire, checks that some processes are
running, checks the contents of a few small files like /etc/passwd,
/etc/shadow, etc. It's strictly a Unix program for me.
My old perl version generally runs the comparisons, checks file
permissions, reads a couple of files, along with reading the last few
minutes of a few logfiles (something I have yet to really implement in
my new Java version, which will make it run even longer, of course) in
less than a second. My java version does it (minus the logfile
reading) in anywhere between 10 and 15 seconds.
Here's my -Xprof output:
Flat profile of 0.74 secs (37 total ticks): process reaper
Thread-local ticks:
100.0% 37 Unknown: no last frame
Flat profile of 0.69 secs (36 total ticks): process reaper
Thread-local ticks:
100.0% 36 Unknown: no last frame
Flat profile of 0.47 secs (24 total ticks): process reaper
Thread-local ticks:
100.0% 24 Unknown: no last frame
Flat profile of 0.79 secs (41 total ticks): process reaper
Thread-local ticks:
100.0% 41 Unknown: no last frame
Flat profile of 10.98 secs (324 total ticks): main
Interpreted + native Method
1.2% 0 + 2 java.io.UnixFileSystem.getBooleanAttributes0
1.2% 0 + 2 java.lang.System.arraycopy
0.6% 1 + 0 java.io.File.getName
0.6% 0 + 1 ssm.FileStat.getOwner
0.6% 0 + 1 java.util.ResourceBundle.<clinit>
0.6% 1 + 0 java.io.BufferedInputStream.fill
0.6% 1 + 0 sun.nio.cs.US_ASCII$Decoder.decodeArrayLoop
0.6% 0 + 1 java.io.FileInputStream.open
5.8% 3 + 7 Total interpreted
Compiled + native Method
34.7% 59 + 1 java.io.ByteArrayOutputStream.write
27.2% 47 + 0 java.io.BufferedInputStream.read
18.5% 32 + 0 sun.security.provider.MD5.transform
1.2% 2 + 0 java.util.Arrays.mergeSort
1.2% 2 + 0 ssm.MD5Sum.loadByteData
0.6% 1 + 0 java.lang.StringBuffer.length
0.6% 1 + 0 ssm.UnixCrypt.D_ENCRYPT
0.6% 1 + 0 java.lang.String.toString
84.4% 145 + 1 Total compiled
Stub + native Method
0.6% 0 + 1 java.lang.System.arraycopy
0.6% 0 + 1 java.io.FileInputStream.readBytes
1.2% 0 + 2 Total stub
Thread-local ticks:
46.6% 151 Blocked (of total)
0.6% 1 Class loader
7.5% 13 Unknown: no last frame
0.6% 1 Unknown: thread_state
Flat profile of 0.00 secs (1 total ticks): Thread-1
Interpreted + native Method
100.0% 1 + 0
java.security.AccessController.getStackAccessControlContext
100.0% 1 + 0 Total interpreted
Global summary of 11.01 seconds:
100.0% 327 Received ticks
0.3% 1 Received GC ticks
0.6% 2 Compilation
0.3% 1 Class loader
46.5% 152 Unknown code
And, because I'm not really sure what to point anyone at, I'll just
attach
the bulk of my code, sorry...
main:=========================================================
import ssm.*;
import java.io.*;
import java.util.*;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
class SystemsSecurityMonitor {
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