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- 1
- EJB Remote Calls - Serialization Restriction(s)Hi,
I have a simple HelloWorldApplication which uses SSbs.
I pass a Customer Object which has two attribute String name and
Address address;
I made Address not-serializable
so when i make calls to the SessionBean i get a remote Exception which
contains the not-serializable exception in WebPShere (as expected)
To my surprise this application ran without any problem in JRun4.0
Why would that be the case and what would the result in other APp
Servers like WebLogic be?
AFAIK, objects (parameters and Return types) must be serializable for
all Remote EJB Calls.
Note this applicaiton does not use Local Interfaces..
TIA
Manglu
- 3
- J2ME: allowing for "Allow HTTP traffic?" confirmation when doing a connection timeout mechanismI'm using threading in a J2ME app to allow a timeout on an attempt to
connect to server. However, I'm having an issue with the usual
confirmation the user gets on first connection attempt: you know, the
message that say something like "This application would like to send
HTTP traffic. Allow this?" The problem is that I have no idea of how
long the user takes to read this message before hitting "ok", so my
connection timeout could timeout before the user has even hit ok and
before any connection attempt has been made!
Is there any callback available so that I know when the user has
actually hit 'ok'?
My current workaround is to make a dummy first connection to a bad
address, e.g. "http://x", just to get the user to hit 'ok' and get that
out of the way before making my proper connection attempt.
Is there a better way though? This technique makes an attempted DNS
lookup which wastes a little time.
Thanks.
N.B.
I'm aware that in some cases the user can have a preference set so that
the HTTP traffic alert happens before *every* server communication, but
I'm ignoring this case for the moment.
- 4
- New Forum For People Who Love To Discuss On Technical TopicsA new forum for everything in one place has launched at http://www.technicaltalk.net/
This is a cool forum where any one can discuss about many technical
things like Programming, Scripting, Design, Database, Operating
Systems, Testing and even a place where any one can read and post
articles. People will also find some helpfull site links, E-books.
Get registered at http://www.technicaltalk.net/ to explore more.....
http://www.technicaltalk.net/
- 5
- 3 way if"Roedy Green" <email***@***.com> wrote:
> If you were to devise a syntax for 3 way if that gave you clauses to
> execute if the expression were positive, negative or zero what sort of
> syntax would you come up with? I find this pattern showing up all the
> time in writing Comparators.
Sure, because it is the output of the comparision functionality.
Trouble is it is too broad, you only need three values, not two ranges
and a central value.
I put a wrapper interface (named "Sortable") around the comparision
functionality so that it would emit specifically -1, 0, or +1, as
manifest constants named LESS_THAN, EQUAL_TO, and GREATER_THAN, on which
I can then use a simple, symmetric, and clean switch syntax.
Given enumerations, that would presumably be even easier, because then
you could exhaust the enumeration type to the satisfaction of the
compiler, and wouldn't have to include a "default" switch case, the only
wart in my current setup.
xanthian.
--
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- 6
- Help needed with BlueJHi All,
Need help(procedures/steps) to execute
an application program using BlueJ.
I have downloaded the
BlueJTutorial.pdf, read
what is there, I can compile my program,
can make a jar,
but where is the "run" instruction
in the main menu?
Bob
- 6
- Renamed: Lutus alert [Re: how many tomcat instances on one machine]This is a multi-part message in MIME format.
"Kathy Benson" <email***@***.com> wrote in message news:email***@***.com...
That should not be a problem as long as each one of them is listening on a different port and you have enough memory. We have an application that uses embedded Tomcat and I can start about 15 instances without any problem. I have about 1GB of memory and the initiali heap for Tomcat is set the the default, which I bellieve is 2 MB.
KB
--
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Andy Fish wrote:
Hi,
Just curious to see if anyone has run lots of separate tomcat instances on
one machine. I currently have 2 which works fine, but I wonder if anyone has
ever done 10? 50?
I'd like to be able to host a number of separate instances of my app on the
same box for evaluation purposes and this seems the easiest way of doing it.
They will not be heavily used, so I guess RAM is the biggest factor.
Unfortunately I am on windows 2000 not *nix, so paging will be an issue.
Any comments would be appreciated
Andy
Lutus alert!!!! Hey, looks like SPAM in a signature that advertises a no SPAM product. Is this signature recursive??
--
Gary
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META http-equiv=Content-Type content=text/html;charset=ISO-8859-1>
<META content="MSHTML 6.00.2800.1264" name=GENERATOR></HEAD>
<BODY bgColor=#ffffff>
<DIV>"Kathy Benson" <<A
href="mailto:email***@***.com">email***@***.com</A>> wrote in
message <A
href="news:email***@***.com">news:email***@***.com</A>...</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">That
should not be a problem as long as each one of them is listening on a
different port and you have enough memory. We have an application that uses
embedded Tomcat and I can start about 15 instances without any problem. I have
about 1GB of memory and the initiali heap for Tomcat is set the the default,
which I bellieve is 2 MB.<BR><BR>KB<BR>
<DIV class=moz-signature>-- <BR>
<STYLE type=text/css>P {
FONT-SIZE: 12px; COLOR: black; FONT-FAMILY: Tahoma, Arial, Verdana
}
H1 {
}
H2 {
}
H3 {
}
HR {
WIDTH: 80%; COLOR: #cc0000; LINE-HEIGHT: 1; HEIGHT: 1px; TEXT-ALIGN: left
}
A {
}
A:visited {
}
A:active {
}
A:hover {
}
BODY {
FONT-SIZE: 12px; COLOR: black; FONT-FAMILY: Tahoma, Arial, Verdana
}
TABLE {
FONT-SIZE: 11px; COLOR: black; FONT-FAMILY: Tahoma, Arial, Verdana
}
</STYLE>
<HR>
This email is certified to be Spam free by Spam Marshall<BR>
<P>You don't pay to get spam, why pay to clean it?<BR>Visit <A
class=moz-txt-link-freetext
href="http://www.spammarshall.com">http://www.spammarshall.com</A> to create
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target=_blank><IMG
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<HR>
</DIV><BR><BR>Andy Fish wrote:<BR>
<BLOCKQUOTE cite=midwJNjb.275$email***@***.com type="cite"><PRE wrap="">Hi,
Just curious to see if anyone has run lots of separate tomcat instances on
one machine. I currently have 2 which works fine, but I wonder if anyone has
ever done 10? 50?
I'd like to be able to host a number of separate instances of my app on the
same box for evaluation purposes and this seems the easiest way of doing it.
They will not be heavily used, so I guess RAM is the biggest factor.
Unfortunately I am on windows 2000 not *nix, so paging will be an issue.
Any comments would be appreciated
Andy
</PRE></BLOCKQUOTE><BR><FONT face=Arial size=2>Lutus alert!!!! Hey, looks
like SPAM in a signature that advertises a no SPAM product. Is this
signature recursive??<BR>-- <BR>Gary</FONT></BLOCKQUOTE></BODY></HTML>
- 8
- java/74574: Making NetBeans 4.0 available
>Number: 74574
>Category: java
>Synopsis: Making NetBeans 4.0 available
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-java
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: update
>Submitter-Id: current-users
>Arrival-Date: Wed Dec 01 06:00:49 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Manfred N. Riem
>Release: 5.3-RELEASE
>Organization:
>Environment:
FreeBSD lord.home 5.3-RELEASE FreeBSD 5.3-RELEASE #0: Fri Nov 5 04:19:18 UTC 2004 email***@***.com:/usr/obj/usr/src/sys/GENERIC i386
>Description:
The latest version of the NetBeans IDE is 3.6 and currently the 4.0 releases are in release candidate phase. I have the necessary files for
the port but I don't know whom to send it to.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
- 11
- Deployment problem with messge driven beans.When deploying a message driven bean I get the following error. Can
anyone help?
boss-3.0.8/server/default/deploy/TextMDB.jar
14:11:06,681 INFO [EjbModule] Creating
14:11:06,711 INFO [EjbModule] Deploying TextMDB
14:11:06,811 INFO [JMSContainerInvoker] Creating
14:11:06,821 INFO [JMSContainerInvoker] Created
14:11:06,831 INFO [EjbModule] Created
14:11:06,841 INFO [EjbModule] Starting
14:11:06,851 WARN [MessageDrivenContainer]No resource manager found
for jms/QCF
The ejb-jar.xml and jboss.xml is as follows:
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise
JavaBeans 2.0//EN"
"http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<message-driven>
<ejb-name>TextMDB</ejb-name>
<ejb-class>com.gbst.socketlistener.TextMDB</ejb-class>
<transaction-type>Container</transaction-type>
<acknowledge-mode>AUTO_ACKNOWLEDGE</acknowledge-mode>
<message-driven-destination>
<destination-type>javax.jms.Queue</destination-type>
</message-driven-destination>
<resource-ref>
<res-ref-name>jms/QCF</res-ref-name>
<res-type>javax.jms.QueueConnectionFactory</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</message-driven>
</enterprise-beans>
</ejb-jar>
<?xml version="1.0"?>
<jboss>
<enterprise-beans>
<message-driven>
<ejb-name>TextMDB</ejb-name>
<destination-jndi-name>queue/ListenerQueue</destination-jndi-name>
<resource-ref>
<res-ref-name>jms/QCF</res-ref-name>
<jndi-name>QueueConnectionFactory</jndi-name>
</resource-ref>
</message-driven>
</enterprise-beans>
</jboss>
Jamie
- 12
- Somone got a 4096x4096 pixel screen at sunWell at least it looks like that if you try to look at this new, quite
helpful "poster-map" from sun:
http://java.sun.com/developer/onlineTraining/new2java/javamap/index.html
I had to go to full-screen mode in my browser, otherwise the controls at
the bottom wouldn't appear and I couldn't see more than 5% of the poster
and navigate around.
It's also downloadable as PDF here
http://java.sun.com/developer/onlineTraining/new2java/javamap/Java_Technolo
gy_Concept_Map.pdf
CU
Ren?
--
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Usenet Newsgroup Service $9.95/Month 30GB
- 15
- have tomcat run a c binary via cgiAnyone know how to make tomcat run an actual exe?
I'm using windows 2000.
I can get it to print the binary contents of the exe to the web page,
but not actually execute it.
The docs indicate that you specify an executable in web.xml where you
specify cgi and that the default is perl, but I don't need an
interpreter to run an exe.
thanks
- 15
- Eclipse Appearance ProblemHi all,
I have Eclipse (version: 3.2.2) and JRE (version:1.6.0.1) installed on
my Windows Vista System. When I am working regularly with Eclipse I
encounter with disappearance of some regions of Eclipse window.
Specifically package explorer and console regions are becoming a white
area right after I switch(focus/bring to front) from another
application to Eclipse. If I resize the Eclipse window or just make
some mouse gestures over those white area, they return back to normal.
I have no idea about the problem so I could not goggled it. Here is a
screenshot: http://www.imagehosting.com/show.php/502707_20070421132840.png.html
- 15
- Hashtable: remove elements while Enumerating"Chris Berg" wrote:
> 1) Make a new Hashtable, copy all the 'good' entries into the new
> one, then replace the old one with the new one. This MAY be bad if
> another class still holds a reference to the old table.
>
> 2) make a new Vector in which you remember all keys of entries
> that shall be removed, and then remove them AFTER having finished
> the iteraton.
3) Copy (clone()) the Hashtable. Iterate over the copy. If you find an
entry in the copy that should be removed, remove it from the original.
Make sure that no other thread works the original Hashtable while you
enumerate over the copy and manipulate the original.
- 15
- URGENT RXTX SERIAL PORTHello
This is my situation :
A PC under OS MandrakeLinux 10.1
A machine branched on the serial port
I use jdk1.5 and the rxtx API
Opening the port seems good, i send data to the machine but when i read
th response i have a buffer with bytes null.
I have tried to sniff the serial port but i don't understand the data i
intercept, i don't recognize my protocol !
I don't know how i can debug to know what's wrong.
Any help will be welcome.
Thanks
Nanou
- 16
- Comparables and GenericsHow do I express "A Comparable that can be compared to itself" in generics?
I have a method that takes as parameter an array of Comparables.
Whilst trying to "modernize" this code, I can no longer write simply:
public void myMethod(Comparable[] primaryKeyValues)
but need to add "generic info" to Comparable.
The only requirement I have is that the objects should be able to run a
compareTo() on an instance of their own classes.
--
Josef Garvi
"Reversing desertification through drought tolerant trees"
http://www.eden-foundation.org/
new income - better environment - more food - less poverty
- 16
- OT. Being Ronald L. Grossi. (Brother Ronald has a website).D-word wrote:
> Smokie Darling (Annie) wrote:
> > Zippy wrote:
> > > alt.drugs.hard, alt.support.arthritis, comp.lang.java.programmer,
> > > alt.sports.football.pro.ne-patriots, alt.security.terrorism.
> > >
> > > Can someone please tell me what all these groups have in common
> that
> > > they are in such urgent need of salvation? these kind of posts
> always
> > > have the same selection of newsgroups. I can only assume that it
is
> > the
> > > same person or group of people doing the posting. But the
newsgroup
> > > list still intrigues me.
> > >
> > > Answers please - sensible or not, humorous or not, in fact
> whatever.
> > Go
> > > on humour me.
> > >
> > > Zippy
> >
> > Nothing other than the fact that posting through Google, one can
only
> > send to 5 groups at a time, and apparently Yahoo caught on to Ron
> > Gossi, so now he's being more creative with his name? Trust me,
> he'll
> > be posting to almost every other group available on Google through
> out
> > the day. That'd be his MO
>
>
>
> Usenet isn't the only forum he spams, according to google
> (http://www.groupsrv.com/science/post-784999.html).
>
>
> Ron can (apparently) be reached for comment at: 919-553-7901
>
Correction, that number could be wrong, it is registered to "Dufresne."
*HOWEVER* This just in. Brother Ronald has a website.
Let's hear it for "Triumphant Ministries" (http://tinyurl.com/c96dw),
"Internet Evangelist" Ronald L. Grossi, and the power of the one true
god, Google. Can I get an Amen?
http://www.arkwebshost.com/advice/host/
|
| Author |
Message |
Bill Cunningham
|
 Posted: 2003-7-5 9:49:00 |
Top |
java-programmer, main() parameters
What's the difference in these parameters?
main(String[] args) and main(String args[]) ?
public class app extends Applet{
public static main void (String[] args)....
Bill
-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
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-----== Over 80,000 Newsgroups - 16 Different Servers! =-----
|
| |
|
| |
|
Richard Klein
|
| Posted: 2003-7-6 2:13:00 |
Top |
java-programmer >> main() parameters
There is no difference, you can declare an array like String[] args or
String args[]
Richard
"Bill Cunningham" <email***@***.com> schreef in bericht
news:email***@***.com...
> What's the difference in these parameters?
>
> main(String[] args) and main(String args[]) ?
>
> public class app extends Applet{
> public static main void (String[] args)....
>
> Bill
>
>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----
|
| |
|
| |
|
BobJ
|
| Posted: 2003-8-1 1:39:00 |
Top |
java-programmer >> main() parameters
No diff - just an attempt by Sun to make things easier for C++ programmers
as they switch to Java, so they allow either form..
BobJ
"Bill Cunningham" <email***@***.com> wrote in message
news:email***@***.com...
> What's the difference in these parameters?
>
> main(String[] args) and main(String args[]) ?
>
> public class app extends Applet{
> public static main void (String[] args)....
>
> Bill
>
>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----
|
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Index ‹ java-programmer |
- Next
- 1
- To correct my program. please, check to find errors and correct me.import. Java.io.*;
import. Java.text.NumberFormat;
public class commander
public. static.void man(String[]args)throws IOException
BufferedReader in =
new BufferedReader(New InputStreamReader(Systemin));
int (commander);
System.out.println("Enter your code");
code = integer.parseint(in.readLine());
switch(commander)
{
case 1:
System.out.println("The status of president of United States);
break;
case 2:
System.out.println("The status of secretary of Defense);
break;
case 3:
System.out.println("The status of the Air force);
break;
case 4:
System.out.println("The status of Air force chief staff);
break;
case 5:
System.out.println("The status of Air university commander);
break;
case 6:
System.out.println("The status of Air commader);
break;
default:
System.out.println(" The status of commander is children");
-------------------------------------------------------------------------------
please correct me.
this is switch statement to make program.
- 2
- regex: How to extract substrings?This should be really easy, but I couldn't find it in the tutorials and
documentations on the web:
What is the Java equivalent to the following Perl operation?
my $entry = "__3432__Smith__"
my ($id,$name) =
$entry =~ m/__(\d+)__([A-z]+)__/;
In other words, I want to extract the number and the name from the
string $entry, using a regular expression.
I tried the following:
Pattern p = Pattern.compile("__([0-9]+)__([A-z]+)__");
Matcher m = p.matcher("__3432__Smith__");
while(m.find()){
System.out.println(m.group());
}
But that gives me the complete match at once, not the two subgroups that
I specified using the parens: (\d+) and ([A-z]+).
Who can help?
Thanks!
- 3
- editing nodes in JTree, icon problemI have a JTree with a child node that has a dropdown list in it. When I
click on the node to make the list appear, then make a selection, the
icon changes to what looks like a document icon.
My problem is that the document icon stays there after I make the
selection in the dropdown list until I click on another node. It's like
the process of making a selection is unfinished.
Anyone know what that is?
- 4
- Does my panel play hide & seek ?Hi,
In an application, that uses internal frames and the JDesktopPane! I
now want to add a pane to my application to the right side of the
window. But this pane should be hidden. In the sense when i click on a
button, it creep inside slowly and when i click on it, it should creep
out slowly again.
Is such a thing possible with swing? or is there any other way possible
for this?
Plz help,
kind regards,
Rajesh Rapaka.
- 5
- Difficulty with swingswe r beginners in java, creating an application similar to paintbrush.
(still working on the frontend)what r the different packages and classes that we could use to create a new window by selecting the "New" option from the MenuBar.What other sites could we visit for help?what r the recommended books that we could refer to ?
Thank you in advance.
--
Message posted via http://www.javakb.com
- 6
- Azureus wont compile coz of 4E4D4554484F440E4350500525Hello people...
So, after dodging Azureus dependancies, this might be the final hurdle
to get Azureus to compile :/
Anyway... I got an internal error (4E4D4554484F440E4350500525)
I got that error when I was installing something called "sed"
(/usr/ports/net/sed ?), but that got resolved once I mounted
linprocfs...
But Azureus refuses to compile...
I googled further more and one site tells me to add -Xint to my java
command line... I added that in the last line of work/azureus file
that was created. And thats how the number of files mentioned in the
output below reduced from 2000 something to 1476... Good thing/bad
thing???
Any ideas how to get this working?
Below from BEGIN to END is the exact console output...
PS: please CC your replies to me coz im not on the list....
=====BEGIN (I'm in directory /usr/ports/net-p2p/azureus)=====
hostname# make install clean
===> Building for azureus-2.4.0.2
Buildfile: build.xml
init:
compile:
[javac] Compiling 1476 source files to /usr/ports/net-p2p/azureus/work/build
[javac] #
[javac] # An unexpected error has been detected by HotSpot Virtual Machine:
[javac] #
[javac] # Internal Error (4E4D4554484F440E4350500525), pid=49360,
tid=0x50f000
[javac] #
[javac] # Java VM: Java HotSpot(TM) 64-Bit Server VM
(diablo-1.5.0_07-b00 mixed mode)
[javac] # An error report file with more information is saved as
hs_err_pid49360.log
[javac] #
[javac] # If you would like to submit a bug report, please write
[javac] # a letter to email***@***.com mailing list
[javac] #
BUILD FAILED
/usr/ports/net-p2p/azureus/work/build.xml:22: Compile failed; see the
compiler error output for details.
Total time: 48 seconds
*** Error code 1
Stop in /usr/ports/net-p2p/azureus.
hostname#
====END====
cheers...
Ahmed
- 7
- NullPointerException in javax.swing.JComponent.reshapeI sometimes get the following exception in my GUI. It is not always
reproducible, so I don't know when it throws this exception. Any idea
what could be the problem?
java.lang.NullPointerException
at javax.swing.JComponent.reshape(JComponent.java:3507)
at java.awt.Component.setBounds(Component.java:1664)
at java.awt.Component.move(Component.java:1541)
at java.awt.Component.setLocation(Component.java:1533)
at javax.swing.JViewport.setViewPosition(JViewport.java:1075)
at
javax.swing.JViewport.scrollRectToVisible(JViewport.java:396)
at
javax.swing.JComponent.scrollRectToVisible(JComponent.java:2636)
at com.sun.forte.st.mpmt.AnTable$1.run(AnTable.java:651)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
- 8
- Pogo Game, etc
I'm a pogo fan and an anspiring Java programmer/software
deceloper/enginneeer .
I'm curious if maybe the source code could be out on the internet
somewhere .
Do you think that maybe somebody could also explain to me about how
the graphics are created and what libraries are they using to create
game such
as poppit, etc.... I know about swing but isnt swing for creating
windows and
user interfaces ? (kind of like visual basic???) .
I would really apprececiate any input regarding my question .
- 9
- Jmagick and rotating image.Hello,
I am using Jmagick to manupulate and rotate images. When I rotate an
image, it gets a white color where no image is standing (in the
corners). I already tried with convertImg.setBackgroundColor( new
PixelPacket(100,50,100,200) ); but the whitespaces stay... ...white. I
need to have those areas transparent. I am using
imgInfo.setColorspace( ColorspaceType.TransparentColorspace ); so it
must be possible. can annyone help me with this?
When using imagemagick commandline I get what I need by using -
background none -rotate 10
I hope someone can help me.
thanks,
Erik
- 10
- 1376180 CD-R, DVD R, DVD CASES LOWEST PRICE! 13 media4sale.com offers innovative and quality media, CD/DVD packaging and
other computer accessories at the best prices. We pride ourselves in
service, quality and commitment and are certain that our standards will
exceed expectations.
http://www.media4sale.com
<a href="http://www.media4sale.com" target="_blank">Media4Sale.com</a>
- 11
- Is i irrational? (was Re: Versionincrementaphobia)In comp.lang.java.advocacy, James Westby
<email***@***.com>
wrote
on Tue, 07 Mar 2006 20:34:56 GMT
<Q7mPf.94623$email***@***.com>:
> Ian Pilcher wrote:
>> James Westby wrote:
>>
>>>What makes you think that i is rational?
>>
>>
>> I'll bite. What do you put after the decimal point?
>>
>
> I don't know, but I imagine that I couldn't write it in closed form. For
> that matter what do you pu in front?
>
> I always assumed that i would be irrational, but maybe it is neither
> irrational nor rational.
An interesting philosophical question. If a number is
rational it can be expressed as p/q, where p and q are
integers, q != 0. Therefore i is not rational.
However, it's not clear whether i is irrational or not,
since irrational also means "not rational", but I for one
would think that an irrational number is real, and i is
not real.
Also, there are at least two different ways of defining
a real number (Dedekind cuts and Cauchy sequences), and
neither can be used for i, since i is not part of the
total real ordering, nor can it be the limit of any sequence of
rationals, even allowing for silly claims such as -1 = 1+2+4+8+... .
(Briefly: if x = 1+2+4+..., then 2*x=2+4+8+... = x-1;
therefore 2*x = x-1 or x = -1, despite all partial sums
of the series being positive. But it's not i.)
On the flip side, though,
http://mathworld.wolfram.com/IrrationalNumber.html simply
defines an irrational number as any number which cannot
be a quotient p/q of two integers, but the definition is a
bit sloppy since it implies irrational numbers have decimal
expansions (though it has real and imaginary parts, which can).
This appears to be a "definitional bug".
It gets bizarre though, as i is an algebraic integer,
and a unit of the algebraic number field. (There are a
lot of units in that field, as opposed to the two units +1
and -1 in the rational field.)
So now we have a non-rational algebraic unit. At this
point it's probably best to head out for a coffee or
tea break as one's brain is probably screaming for aspirin
at this point. :-)
Followups to a slightly more logical discussion area. :-)
>
>
> James
--
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- 12
- 13
- Tomcat, creating threadsI am trying to do some thread profiling on a website that consists
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I'm not sure, but I think these threads are being created every time my
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threads are coming from? Or, if they are being created by tomcat, can
I tell tomcat to name them something different?
Thanks in advance.
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