XEmacs problems in OS 10.5.7
After updating to 10.5.7, characters I type into XEmacs are scrambled. For example, when
I enter 'bcd", I see '071' on the screen. I didn't have any problem with 10.5.6.
XEmacs. Wow. That's been a while
Where did you get your XEmacs? MacPorts?
Eric
Similar Messages
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Hello all,
I am using Oracle 8i in Linux, and I have a "small" problem with SQL Plus on the console.
When I am SELECTing many columns from a table, they don't fit on the xterm... I can't scroll horizontally to see the formated output...
How can I scroll on a xterm or other kind of terminal?
Thanks,
RaulI use emacs or xemacs to provide this scrolling functionality, here is how:
1. start emacs (or xemacs)
2. M-x shell, to open up a shell
3. sqlplus, to run sqlplus in the shell.
4. M-x hscroll-mode (emacs) or M-x set-var, truncate-lines, 'false (xemacs)
5. set linesize = 32000, in sqlplus
You get then use the virtual terminal scrolling capabilities within emacs to conveniently view sqlplus output. Plus you have the full power of the emacs clipboard / buffer commands available to you.
null -
Memory leak checking doesn't work: SEGV problem while debugging with dbx
I am debugging a program which has memory leaks.
When I do the following:
dbx <program>
(dbx) run <input parameters>
everything runs fine, but as I didn't use RTC leaks checking, this is of no use. Therefore I do the following:
dbx <program>
(dbx) check -memuse
memuse checking - ON
(dbx) check -leaks -frames 8
leaks checking - ON
(dbx) run <input parameters>
which gives the following result:
Running: <program> <input parameters>
(process id 17075)
Reading rtcapihook.so
Reading rtcaudit.so
Reading libmapmalloc.so.1
Reading rtcboot.so
Reading librtc.so
RTC: Enabling Error Checking...
t@1 (l@1) signal SEGV (no mapping at the fault address) in __rtc_memcpy at 0xffffffff7312ed90
0xffffffff7312ed90: __rtc_memcpy+0x0014: st %o4, [%o0 + %o3]
dbx: Stopped within call to '__rtc_suppress_always'. Starting new command interpreter
(dbx) where -l
current thread: t@1
[1] libaio.so.1:_init(0xfffffffe52000058, 0x0, 0xffdfffff, 0xfffffffe52000030, 0x400000, 0x80000), at 0xfffffffe55907a90
[2] ld.so.1[L]:setup(0xffffffff7ffff250, 0x0, 0xffffffff7f72c2b0, 0x10000, 0x0, 0x0), at 0xffffffff7f610ba4
[3] ld.so.1[L]:_setup(0xffffffff7fffffab, 0x1f, 0xffffffff7ffff640, 0xffffffff7fffffbe, 0xffffffff7ffff628, 0xffffffff7f72dde8), at 0xffffffff7f61f24c
[4] ld.so.1[L]:_rt_boot(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xffffffff7f6052d4
I think this means that there is a problem within my 'RTC' libraries.
When I run the "version" command within my dbx session, I get following results:
(dbx) version
Machine hardware: sun4u
OS version: 5.9
Processor type: sparc
Hardware: SUNW,Sun-Fire-480R
The following components are installed on your system:
Sun Studio 9
Sun Studio 9 C Compiler
Sun Studio 9 C++ Compiler
Sun Studio 9 Tools.h++ 7.1
Sun Studio 9 C++ Standard 64-bit Class Library
Sun Studio 9 Garbage Collector
Sun Studio 9 Fortran 95
Sun Studio 9 Debugging Tools (including dbx)
Sun Studio 9 Debugger GUI
Sun Studio 9 Performance Tools (including collect, ...)
Sun Studio 9 X-Designer
Sun Studio 9 VIM editor
Sun Studio 9 XEmacs editor
Sun Studio 9 Native Connector Tool
Sun Studio 9 LockLint
Sun Studio 9 Building Software (including dmake)
Sun Studio 9 Documentation Set
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/cc": Sun C 5.6 2004/07/15
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/CC": Sun C++ 5.6 2004/07/15
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/f90": Sun Fortran 95 8.0 2004/07/15
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/dbx": Sun Dbx Debugger 7.3 2004/07/15
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/analyzer": Sun Performance Analyzer 7.3 2004/07/15
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/dmake": Sun Distributed Make 7.5 2004/07/15
Can anybody help me out?
Which additional information do I need to provide in order to solve this issue?
Message was edited by: B.V. (the "where -l" command has been added
B.V.Hello Maxim,
As you said, it was worth to try, but unfortunately, it was not a very good investment :-(
The patch 117564-06 has been installed, and I have retried the same procedure, but the same problem occurs.
As you have mentioned in a previous reply, I have flagged the "rtc_error_stack" before launching the "where" command.
The result is the following:
Running: <program> <input parameters>
(process id 21873)
Reading rtcapihook.so
Reading rtcaudit.so
Reading libmapmalloc.so.1
Reading rtcboot.so
Reading librtc.so
RTC: Enabling Error Checking...
t@1 (l@1) signal SEGV (no mapping at the fault address) in __rtc_memcpy at 0xffffffff7312f068
0xffffffff7312f068: __rtc_memcpy+0x0014: st %o4, [%o0 + %o3]
dbx: Stopped within call to '__rtc_suppress_always'. Starting new command interpreter
(dbx) dbxenv rtc_error_stack on
(dbx) where -l
current thread: t@1
=>[1] librtc.so[0xffffffff7de01778]:__rtc_memcpy(0xfffffffe5013fff0, 0xfffffffe50220040, 0x8, 0x
10, 0x803, 0x64a3c338), at 0xffffffff7312f068
[2] librtc.so[0xffffffff7de01778]:change_masks_work(0xfffffffeff90e878, 0xfffffffeff90e878, 0x
803, 0x2, 0x0, 0xffffffff73243608), at 0xffffffff7312e618
---------- called from debugger ----------
[3] libmd5.so.1:_init(0xfffffffe50b00228, 0x0, 0xffdfffff, 0xfffffffe50b00208, 0x400000, 0x800
00), at 0xfffffffe531016e0
[4] ld.so.1[L]:setup(0xffffffff7ffff260, 0x0, 0xffffffff7f72c2b0, 0x10000, 0x0, 0x0), at 0xfff
fffff7f610ba4
[5] ld.so.1[L]:_setup(0xffffffff7fffffa6, 0x1f, 0xffffffff7ffff650, 0xffffffff7fffffb9, 0xffff
ffff7ffff638, 0xffffffff7f72dde8), at 0xffffffff7f61f24c
[6] ld.so.1[L]:_rt_boot(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xffffffff7f6052d4
(dbx)
Any ideas?
Thanks
Dominique -
Pacman -Su - X fonts / fluxbox problem
Dang, I'm sorry to pile in with a ton of problems, but this one has really knocked me out.
I just did pacman -Sy and then pacman -Su and I seem to have completely hosed the X font server. I seem to remember reading something somewhere about this recently, but now i can't find it.
The upgrade didn't go smoothly and I've probably screwed something up.
First it crashed in the download complaining of xemacs-sumo from unofficial. I removed this package and then it completed the download and moved to dependency check.
Then the dependency check kept complaining about a ton of stuff in:
/usr/share/cups/model/... and
/usr/share/locale/de/LC_MESSAGES/ something.mo
as well as the same file in a few other languages ja, and two or three others.
Here I probably did a bad thing,I deleted these directories and files.
This let the upgrade proceed to completion but it wasn't good afterward.
At first I tried to fire up mozilla and I just get Exit 1. Then I exited X and rebooted but afterward, when I startx, fluxbox has these microscopic menus and slot. I exit X and find messages complaining about missing fonts.
Any advice (other than Hit the Road 8-) is very much appreciated.
Thank You...
John E. A.if you really want to have the 1.4a version of mozilla then:
as root run :
abs
then:
cd /usr/abs/network/mozilla
<youreditor> PKGBUILD
change the pkver line to 1.4a then edit the source=() to the prper url to the 1.4a source.
then issue:
makepkg
sit back and wait while it compiles. when it is done
pacman -U mozilla-1.4a-1.pkg.tar.gz
you do not need to install the lib or include packages that are also built.
the whole process will take about an hour if you are using about a 1.53 GHz chip. -
I built xemacs from source under OS X 10.7 (I think it was) with no problem. My only flag to 'configure' was the path of the install directory.
That executable failed to run under Mavericks, so I tried the build again: run 'make distclean', run 'configure', and then run 'make'. That step completed compilations but failed with ld errors: many duplicate symbols. These duplicates appeared to be due to wrong preprocessing of C++ inline declarations, so I altered the #define for inlines in the Makefile that had been generated by configure. Duplicate symbols went away, and the executable got built. However, the full build includes loading lisp files. A few files failed to load, although they exist in the seeming correct place.
I tried running the executable anyway and got this:
dyld: Library not loaded: /usr/X11/lib/libXaw.8.dylib
Referenced from: /Users/marks/packages/xemacs/bin/xemacs
Reason: image not found
libXaw.8.dylib indeed does not exist, at least not at that location. There is, however, a file called libXaw8.8.dylib. I guess this is a typo in the name, especially considering that there are other files in that dir called libXaw.[67].dylib.
So: the macros in the Xemacs configuration need some tweaks; there's something screwy in Mavericks' (?) X11 libs; and there's a problem getting all the lisp files loaded during the build.
My system: 20-inch iMac (2.4 GHz Intel Duo, early 2008); OS X 10.9, XCode 5.0.2. Source for xemacs 21.4.22 (current release).
Comments? Way forward?Post your topic in the Apple developer community > Developer Forums: Apple Support Communities
-
Problem with initialization environment files
I'm trying to get a .profile file to work in my login environment, but it just doesn't want to cooperate. I get errors on just about everything. In fact, the only thing I've been able to get to work is the echo command. It doesn't matter whether or not I use fully qualified paths for the commands or not. Here's a short list of some of the problems.
1. Blank lines generate the following error...
: command not found
2. pwd command generates the following error...
: command not found
3. /bin/ls command generates the following error...
: No such file or directory
4. Echoing the PATH environment variable actually works...
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
BTW, these commands work just fine from the command line. But if I manually run .profile, or have it run automatically when I launch a terminal window, these errors appear. I'm very familiar with command line interfaces as I've used a multitude of shells over the years in both Solaris and Linux environments. I just don't get what's going on with the Mac. Searching with Google has also drawn a blank, so far. I'm hoping someone has a simple answer for this.First, by any chance did your .profile get transferred to your Mac via a Windows system so that it is now <CR><LF> terminated. That will mess up just about every Unix shell
Here are the steps I used to initially get my environment files over to the Mac.
1. Created a tar file on a linux platform with my pre-existing environment files.
2. Tar file was compressed with gzip.
3. Compressed tar file was then burned to CD.
4. CD loaded onto a Windows platform.
5. From Windows platform, tried to email tar file to myself but it was too big to send.
6. From Windows used WinZip to uncompress and open the tar file.
7. Extracted the contents to a folder.
8. Removed unnecessary files from folder to make result smaller. Also split contents of folder into multiple folders.
9. Used WinZip to zip new folders containing necessary files into multiple zip files.
10. Emailed zipped files to my home email account.
11. Opened email from Mac and downloaded zip files.
12. From a terminal window unzipped files using /usr/bin/unzip.
13. Copied environment files to home directory with a cp –pr command.
14. Disabled all environment files (by adding different file extensions) so I could begin experimenting with what I needed to change.
15. Started with the .profile file by commenting out most of the file and leaving just a few commands. This is when my problems began. BTW, I used xemacs to edit the file. Xemacs was download and installed via Macports a while back in preparation for creating a development environment for myself. Getting my login environment going was my next step in the process.
16. Since I couldn't get it to work, I then put nothing but some simple shell commands in the .profile to see what would happen. Commands like pwd, ls, and echo. And as I explained in the original post, the only thing that worked was the echo command.
Looking at the preceding steps, the files were never opened on the Windows platform… is it possible that the WinZip steps caused <CR><LF> characters to appear somehow? Or, is it possible that xemacs messed up my file? I use emacs and xemacs all the time on linux and solaris systems with no such problems. Actually, at one point in my messing with the .profile file, in frustration, I decided to open it with vi. I hate vi, but know just enough to be dangerous. What I did was to remove a blank line (remember, blank lines are generating errors too) and insert another one. I figured vi is about as basic and primitive an editor as you can get. So, if any funny control characters are present, that should at least alleviate the problem. Unfortunately, even that still generated the same error.
Have you tried a simplified .profile?
Yes. See #16 above.
Do you have more than one shell initialization file. Bash will look for
.bash_profile
.bash_login
.profile
in that order and use the first one it finds, then stop looking. If you any of the 2 earlier initialization files, bash will not bother looking at your .profile
No, I do not have more than one initialization file... at the moment. And yes, I know what bash looks for, and in what order. At the moment I am only using a .profile just to see if I can get things working. See #14 and #15 above.
I am assuming your shell is 'bash', the current Mac OS X default, however, if you started using Macs back in the Jaguar days, and have just been upgrading, then you shell might be tcsh, which would not even look at .profile, and trying to run it interactively would generate strange results when interpreted by tcsh.
And of course, it is always possible you intentionally changed your shell. If you did that would be useful information. I suspect you did not, but I figured I would ask.
Yes, I'm using the bash shell. $SHELL returns /bin/bash, and $0 returns -bash.
If your lines end in ^M, then your .profile has been DOS'ified.
Ok, I did the cat command you've suggested. BTW, thanks for the options on the cat command. I didn’t realize cat had options to show special characters. I’ve used it for years and never really looked at the man page on it. I believe there is also a way to see control characters within xemacs, but I can’t remember how to do that.
Anyway, the file is definitely showing ^M characters. My first question is, is ^M the same as <CR><LF>? The reason I ask is it may have been xemacs that put those there, or they may have already been there from the files I transferred from the linux platform. I'm pretty sure xemacs uses ^M's because whatever mode I was able to put xemacs in in the past to see control characters, I'm about 99% sure I've seen all lines ending in that. Of course, that brings me to my next question. If that's true, why do these files work on linux and solaris platforms and not OS X? Like I said, I do most of my editing with xemacs, and I know the environment files were originally created on the other platforms using xemacs.
If you have any ideas on these questions, please enlighten me. In the mean time, I'll play around with trying to get rid of the ^M's to see what happens. Not sure how I'm going to do that though since I'm not that familiar with a lot of other editors, so I wouldn't know how to load the files and remove the invisible ^M characters. I also really do not want to hand type in all my environment files if this turns out to be the problem. And if I use xemacs to perform the editing, then it'll just save the file with ^M's anyway.
Thanks for your help. -
I am trying to implement some kind of a server listening for requests. The listener part of the app, is a daemon thread that listens for connections and instantiates a handling daemon thread once it gets some. However, my problem is that i must be able to kill the listening thread at the user's will (say via a sto button). I have done this via the Sun's proposed way, by testing a boolean flag in the loop, which is set to false when i wish to kill the thread. The problem with this thing is the following...
Once the thread starts excecuting, it will test the flag, find it true and enter the loop. At some point it will LOCK on the server socket waiting for connection. Unless some client actually connects, it will keep on listening indefinatelly whithought ever bothering to check for the flag again (no matter how many times you set the damn thing to false).
My question is this: Is there any real, non-theoretical, applied way to stop thread in java safely?
Thank you in advance,
LeftyThis was one solution from the socket programming forum, have you tried this??
public Thread MyThread extends Thread{
boolean active = true;
public void run(){
ss.setSoTimeout(90);
while (active){
try{
serverSocket = ss.accept();
catch (SocketTimeoutException ste){
// do nothing
// interrupt thread
public void deactivate(){
active = false;
// you gotta sleep for a time longer than the
// accept() timeout to make sure that timeout is finished.
try{
sleep(91);
}catch (InterruptedException ie){
interrupt();
} -
A problem with Threads and MMapi
I am tring to execute a class based on Game canvas.
The problem begin when I try to Play both a MIDI tone and to run an infinit Thread loop.
The MIDI tone "Stammers".
How to over come the problem?
Thanks in advance
Kobi
See Code example below:
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
public class MainScreenCanvas extends GameCanvas implements Runnable {
private MainMIDlet parent;
private boolean mTrucking = false;
Image imgBackgound = null;
int imgBackgoundX = 0, imgBackgoundY = 0;
Player player;
public MainScreenCanvas(MainMIDlet parent)
super(true);
this.parent = parent;
try
imgBackgound = Image.createImage("/images/area03_bkg0.png");
imgBackgoundX = this.getWidth() - imgBackgound.getWidth();
imgBackgoundY = this.getHeight() - imgBackgound.getHeight();
catch(Exception e)
System.out.println(e.getMessage());
* starts thread
public void start()
mTrucking = true;
Thread t = new Thread(this);
t.start();
* stops thread
public void stop()
mTrucking = false;
public void play()
try
InputStream is = getClass().getResourceAsStream("/sounds/scale.mid");
player = Manager.createPlayer(is, "audio/midi");
player.setLoopCount(-1);
player.prefetch();
player.start();
catch(Exception e)
System.out.println(e.getMessage());
public void run()
Graphics g = getGraphics();
play();
while (true)
tick();
input();
render(g);
* responsible for object movements
private void tick()
* response to key input
private void input()
int keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0)
imgBackgoundX++;
if (imgBackgoundX > 0)
imgBackgoundX = 0;
if ((keyStates & RIGHT_PRESSED) != 0)
imgBackgoundX--;
if (imgBackgoundX < this.getWidth() - imgBackgound.getWidth())
imgBackgoundX = this.getWidth() - imgBackgound.getWidth();
* Responsible for the drawing
* @param g
private void render(Graphics g)
g.drawImage(imgBackgound, imgBackgoundX, imgBackgoundY, Graphics.TOP | Graphics.LEFT);
this.flushGraphics();
}You can also try to provide a greater Priority to your player thread so that it gains the CPU time when ever it needs it and don't harm the playback.
However a loop in a Thread and that to an infinite loop is one kind of very bad programming, 'cuz the loop eats up most of your CPU time which in turn adds up more delays of the execution of other tasks (just as in your case it is the playback). By witting codes bit efficiently and planning out the architectural execution flow of the app before start writing the code helps solve these kind of issues.
You can go through [this simple tutorial|http://oreilly.com/catalog/expjava/excerpt/index.html] about Basics of Java and Threads to know more about threads.
Regds,
SD
N.B. And yes there are more articles and tutorials available but much of them targets the Java SE / EE, but if you want to read them here is [another great one straight from SUN|http://java.sun.com/docs/books/tutorial/essential/concurrency/index.html] .
Edited by: find_suvro@SDN on 7 Nov, 2008 12:00 PM -
Hi all,
I would like to ask you for a help. I need to write a small program at my university. I started to write a midlet which function would be to countdown time for sports activities. I woul like to start a new thread - the one that counts down - and at the same time make the main thread sleep. After the "countdown" thread finishes, the main thread wakes up and waits for user input. The problem is that when the "countdown" thread finishes his work, I've got Uncaught exception java/lang/NullPointerException. error and the midlet halts.
Below you can find the code
import java.lang.*;
import java.util.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class intervals extends MIDlet implements CommandListener
public Display ekran;
private SweepCanvas sweeper;
private Form rundy;
private TextField round0, round1, round2, round3, round4, round5, round6, round7, round8;
private long czas,x;
private Command exitCommand;
private Command addRound;
private Command delRound;
private Command start;
private TextField repeat;
private Form odliczanie;
private Alert ostrz;
Licznik thread;
String test;
StringItem test1;
int parz,i,j,k;
static int l;
int ilrund;
int ilpowt;
Item sec;
long sec1;
public intervals()
rundy = new Form("Interwały sportowe");
exitCommand = new Command("Wyjście", Command.EXIT, 2);
addRound = new Command("Dodaj","Dodaj rundę", Command.ITEM,1);
delRound = new Command("Usuń","Usuń ostatnią rundę", Command.ITEM,1);
start = new Command("Start", Command.ITEM,1);
odliczanie = new Form("Odliczanie");
TextField dodaj(TextField kolej)
kolej=new TextField("Podaj czas (s) rundy "+parz,null, 4, TextField.NUMERIC);//stworzenie nowej instancji do wybierania czasu trwania rundy
if(rundy.size()==0)
rundy.insert(rundy.size(),kolej);
else
rundy.insert(rundy.size()-1, kolej);
return kolej;
void odliczanie(TextField round)
monitor m=new monitor();
k=Integer.parseInt(round.getString());
ekran.setCurrent(odliczanie);
thread=new Licznik(k,odliczanie);
thread.start();
ekran.setCurrent(rundy);
public void startApp()// throws MIDletStateChangeException
rundy.deleteAll();
repeat = new TextField("Podaj ilość powtórzeń",null,1,TextField.NUMERIC);
rundy.addCommand(addRound);
rundy.addCommand(exitCommand);
rundy.setCommandListener(this);
Canvas obrazek = new MyCanvas();
ekran = Display.getDisplay(this);
ekran.setCurrent(obrazek);
czas=System.currentTimeMillis();
while (System.currentTimeMillis()<czas+1000)
continue;
ekran.setCurrent(rundy);
public void pauseApp()
public void destroyApp(boolean unconditional)
notifyDestroyed();
public void commandAction(Command c, Displayable s)
if (c == exitCommand)
destroyApp(false);
notifyDestroyed();
else if(c==addRound)
if(rundy.size()==0)//Sprawdzenie ilości elementów w celu poprawnego wyświetlania liczby rund w formie
parz=1;
else
parz=rundy.size();
switch(parz)
case 1:
round0=dodaj(round0);break;
case 2:
round1=dodaj(round1);break;
case 3:
round2= dodaj(round2);break;
case 4:
round3=dodaj(round3);break;
case 5:
round4=dodaj(round4);break;
default:
ostrz=new Alert("Uwaga","Maksymalna liczba rund wynosi 9", null, AlertType.INFO);
ostrz.setTimeout(3000);
ekran.setCurrent(ostrz);
if(rundy.size()==1)
rundy.append(repeat);
rundy.addCommand(start);
rundy.addCommand(delRound);
else if(c==delRound)
if(rundy.size()!=0)
rundy.delete(rundy.size()-2);
if (rundy.size()==1)
rundy.deleteAll();
if(rundy.size()==0)
rundy.removeCommand(delRound);
rundy.removeCommand(start);
else if(c==start)
ilrund=rundy.size()-1;
if(this.repeat.size()>0)
ilpowt=Integer.parseInt(this.repeat.getString());
ekran = Display.getDisplay(this);
for (i=1; i<=ilpowt;i++)
odliczanie= new Form("Odliczanie");
for (j=0;j<ilrund;j++)
switch(j)
case 0:
odliczanie(round0);
break;
case 1:
odliczanie(round1);
break;
case 2:
odliczanie(round2);
break;
case 3:
odliczanie(round3);
break;
case 4:
odliczanie(round4);
break;
case 5:
odliczanie(round5);
break;
case 6:
odliczanie(round6);
break;
case 7:
odliczanie(round7);
break;
case 8:
odliczanie(round8);
break;
class Licznik extends Thread
int czas1,k;
Form forma;
monitor m;
public Licznik(int k,Form formap)
czas1=k;
forma=formap;
public synchronized void run()
while(czas1>0)
forma.deleteAll();
forma.append("Czas pozostały (s): "+czas1);
try{Thread.sleep(1000);} catch(InterruptedException e){e.printStackTrace();}
czas1--;
if(czas1<=0)
m.put();
}and monitor class
public class monitor
boolean busy=false;
synchronized void get()
if(!busy)
try
wait();
}catch(InterruptedException e){e.printStackTrace();}
notify();
synchronized void put()
if(busy)
try
wait();
}catch(InterruptedException e){e.printStackTrace();}
busy=true;
notify();
}Can anybody help me with this?Groovemaker,
Your Licznik class has a member m of type monitor, which has not been instantiated (in other words is null) hence, when calling m.put() you get NullPointerException. Please also mind, that using Thread.sleep(1000) is not an accurate way of measuring time.
If I may, please use recommended for Java class naming conventions - some of your names use lower case, while other don't which is confusing to the reader.
Daniel -
Problem with threads within applet
Hello,
I got an applet, inside this applet I have a singleton, inside this singleton I have a thread.
this thread is running in endless loop.
he is doing something and go to sleep on and on.
the problem is,
when I refresh my IE6 browser I see more than 1 thread.
for debug matter, I did the following things:
inside the thread, sysout every time he goes to sleep.
sysout in the singleton constructor.
sysout in the singleton destructor.
the output goes like this:
when refresh the page, the singleton constructor loading but not every refresh, sometimes I see the constructor output and sometimes I dont.
The thread inside the singleton is giving me the same output, sometime I see more than one thread at a time and sometimes I dont.
The destructor never works (no output there).
I don't understand what is going on.
someone can please shed some light?
thanks.
btw. I am working with JRE 1.1
this is very old and big applet and I can't convert it to something new.Ooops. sorry!
I did.
public void start() {
public void stop() {
public void destroy() {
try {
resetAll();
Configuration.closeConnection();
QuoteItem.closeConnection();
} finally {
try {
super.finalize();
} catch (Throwable e) {
e.printStackTrace();
} -
Problem with Threads and a static variable
I have a problem with the code below. I am yet to make sure that I understand the problem. Correct me if I am wrong please.
Code functionality:
A timer calls SetState every second. It sets the state and sets boolean variable "changed" to true. Then notifies a main process thread to check if the state changed to send a message.
The problem as far I understand is:
Assume the timer Thread calls SetState twice before the main process Thread runs. As a result, "changed" is set to true twice. However, since the main process is blocked twice during the two calls to SetState, when it runs it would have the two SetState timer threads blocked on its synchronized body. It will pass the first one, send the message and set "changed" to false since it was true. Now, it will pass the second thread, but here is the problem, "changed" is already set to false. As a result, it won't send the message even though it is supposed to.
Would you please let me know if my understanding is correct? If so, what would you propose to resolve the problem? Should I call wait some other or should I notify in a different way?
Thanks,
B.D.
Code:
private static volatile boolean bChanged = false;
private static Thread objMainProcess;
protected static void Init(){
objMainProcess = new Thread() {
public void run() {
while( objMainProcess == Thread.currentThread() ) {
GetState();
objMainProcess.setDaemon( true );
objMainProcess.start();
public static void initStatusTimer(){
if(objTimer == null)
objTimer = new javax.swing.Timer( 1000, new java.awt.event.ActionListener(){
public void actionPerformed( java.awt.event.ActionEvent evt){
SetState();
private static void SetState(){
if( objMainProcess == null ) return;
synchronized( objMainProcess ) {
bChanged = true;
try{
objMainProcess.notify();
}catch( IllegalMonitorStateException e ) {}
private static boolean GetState() {
if( objMainProcess == null ) return false;
synchronized( objMainProcess ) {
if( bChanged) {
SendMessage();
bChanged = false;
return true;
try {
objMainProcess.wait();
}catch( InterruptedException e ) {}
return false;
}Thanks DrClap for your reply. Everything you said is right. It is not easy to make them alternate since SetState() could be called from different places where the state could be anything else but a status message. Like a GREETING message for example. It is a handshaking message but not a status message.
Again as you said, There is a reason I can't call sendMessage() inside setState().
The only way I was able to do it is by having a counter of the number of notifies that have been called. Every time notify() is called a counter is incremented. Now instead of just checking if "changed" flag is true, I also check if notify counter is greater than zero. If both true, I send the message. If "changed" flag is false, I check again if the notify counter is greater than zero, I send the message. This way it works, but it is kind of a patch than a good design fix. I am yet to find a good solution.
Thanks,
B.D. -
Problem with threads running javaw
Hi,
Having a problem with multi thread programming using client server sockets. The program works find when starting the the application in a console using java muti.java , but when using javaw multi.java the program doesnt die and have to kill it in the task manager. The program doesnt display any of my gui error messages either when the server disconnect the client. all works find in a console. any advice on this as I havent been able to understand why this is happening? any comment would be appreciated.
troy.troy,
Try and post a minimum code sample of your app which
does not work.
When using javaw, make sure you redirect the standard
error and standard output streams to file.
Graeme.Hi Graeme,
I dont understand what you mean by redirection to file? some of my code below.
The code works fine under a console, code is supposed to exit when the client (the other server )disconnects. the problem is that but the clientworker side of the code still works. which under console it doesnt.
public class Server{
ServerSocket aServerSocket;
Socket dianosticsSocket;
Socket nPortExpress;
ClientListener aClientListener;
LinkedList queue = new LinkedList();
int port = 0;
int clientPort = 0;
String clientName = null;
boolean serverAlive = true;
* Server constructor generates a server
* Socket and then starts a client threads.
* @param aPort socket port of local machine.
public Server(int aPort, String aClientName, int aClientPort){
port = aPort;
clientName = aClientName;
clientPort = aClientPort;
try{
// create a new thread
aServerSocket = new ServerSocket(port) ;
// connect to the nPortExpress
aClientListener = new ClientListener(InetAddress.getByName(clientName), clientPort, queue,this);
// aClientListener.setDaemon(true);
aClientListener.start();
// start a dianostic port
DiagnosticsServer aDiagnosticsServer = new DiagnosticsServer(port,queue,aClientListener);
// System.out.println("Server is running on port " + port + "...");
// System.out.println("Connect to nPort");
catch(Exception e)
// System.out.println("ERROR: Server port " + port + " not available");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Server port " + port + " not available", JOptionPane.ERROR_MESSAGE);
serverAlive = false;
System.exit(1);
while(serverAlive&&aClientListener.hostSocket.isConnected()){
try{
// connect the client
Socket aClient = aServerSocket.accept();
//System.out.println("open client connection");
//System.out.println("client local: "+ aClient.getLocalAddress().toString());
// System.out.println("client localport: "+ aClient.getLocalPort());
// System.out.println("client : "+ aClient.getInetAddress().toString());
// System.out.println("client port: "+ aClient.getLocalPort());
// make a new client thread
ClientWorker clientThread = new ClientWorker(aClient, queue, aClientListener, false);
// start thread
clientThread.start();
catch(Exception e)
//System.out.println("ERROR: Client connection failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client connection failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end constructor Server
void serverExit(){
JOptionPane.showMessageDialog(null, "Server ","ERROR: nPort Failure", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}// end class Server
*** connect to another server
public class ClientListener extends Thread{
InetAddress hostName;
int hostPort;
Socket hostSocket;
BufferedReader in;
PrintWriter out;
boolean loggedIn;
LinkedList queue; // reference to Server queue
Server serverRef; // reference to main server
* ClientListener connects to the host server.
* @param aHostName is the name of the host eg server name or IP address.
* @param aHostPort is a port number of the host.
* @param aLoginName is the users login name.
public ClientListener(InetAddress aHostName, int aHostPort,LinkedList aQueue,Server aServer) // reference to Server queue)
hostName = aHostName;
hostPort = aHostPort;
queue = aQueue;
serverRef = aServer;
// connect to the server
try{
hostSocket = new Socket(hostName, hostPort);
catch(IOException e){
//System.out.println("ERROR: Connection Host Failed");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort Failed", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end constructor ClientListener
** multi client connection server
ClientWorker(Socket aSocket,LinkedList aQueue, ClientListener aClientListener, boolean diagnostics){
queue = aQueue;
addToQueue(this);
client = aSocket;
clientRef = aClientListener;
aDiagnostic = diagnostics;
} // end constructor ClientWorker
* run method is the main loop of the server program
* in change of handle new client connection as well
* as handle all messages and errors.
public void run(){
boolean alive = true;
String aSubString = "";
in = null;
out = null;
loginName = "";
loggedIn = false;
while (alive && client.isConnected()&& clientRef.hostSocket.isConnected()){
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if(aDiagnostic){
out.println("WELCOME to diagnostics");
broadCastDia("Connect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
out.println("WELCOME to Troy's Server");
broadCastDia("Connect : client "+client.getInetAddress().toString());
out.flush();
String line;
while(((line = in.readLine())!= null)){
StringTokenizer aStringToken = new StringTokenizer(line, " ");
if(!aDiagnostic){
broadCastDia(line);
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
else{
if(line.equals("GETIPS"))
getIPs();
else{
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
} // end while
catch(Exception e){
// System.out.println("ERROR:Client Connection reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR:Client Connection reset", JOptionPane.ERROR_MESSAGE);
try{
if(aDiagnostic){
broadCastDia("Disconnect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
broadCastDia("Disconnect : client "+client.getInetAddress().toString());
out.flush();
// close the buffers and connection;
in.close();
out.close();
client.close();
// System.out.println("out");
// remove from list
removeThreadQueue(this);
alive = false;
catch(Exception e){
// System.out.println("ERROR: Client Connection reset failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client Connection reset failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end method run
* method run - Generates io stream for communicating with the server and
* starts the client gui. Run also parses the input commands from the server.
public void run(){
boolean alive = true;
try{
// begin to life the gui
// aGuiClient = new ClientGui(hostName.getHostName(), hostPort, loginName, this);
// aGuiClient.show();
in = new BufferedReader(new InputStreamReader(hostSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(hostSocket.getOutputStream()));
while (alive && hostSocket.isConnected()){
String line;
while(((line = in.readLine())!= null)){
System.out.println(line);
broadCast(line);
} // end while
} // end while
catch(Exception e){
// System.out.println("ERRORa Connection to host reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort reset", JOptionPane.ERROR_MESSAGE);
try{
hostSocket.close();
}catch(Exception a){
JOptionPane.showMessageDialog(null, (a.toString()),"ERROR: Exception", JOptionPane.ERROR_MESSAGE);
alive = false;
System.exit(1);
} // end method run -
Problem with Threads and "plase wait..."-Window
Hi everyone,
I have a problem that I'm not able to solve in any way... I have a time-consuming task (a file decryption) which I execute in a separate thread; I've used the SwingWorker class, like suggested by sun-tutorial, and it works right. The problem is that I have to wait that the decryption have finished before continuing with program-execution. Therefore I would like to display a "please wait"-window while the task runs. I've tryed all the possible ways I know but the problem is always the same: the waitWindow is displayed empty, the bounds are painted but the contents no; it's only painted when the decrypt-task has finished. Please help me, I have no more resources....
decrypt-file code:
public class DecryptFile {
private String cryptedFileNameAndPath;
private ByteArrayInputStream resultStream = null;
// need for progress
private int lengthOfTask;
private int current = -1;
private String statMessage;
public DecryptFile(String encZipFileNameAndPath) {
cryptedFileNameAndPath = encZipFileNameAndPath;
//Compute length of task...
// 0 for indeterminate
lengthOfTask = 0;
public ByteArrayInputStream getDecryptedInputStream() {
return this.resultStream;
* Called from ProgressBarDemo to start the task.
public void go() {
current = -1;
final SwingWorker worker = new SwingWorker() {
public Object construct() {
return new ActualTask();
worker.start();
* Called from ProgressBarDemo to find out how much work needs
* to be done.
public int getLengthOfTask() {
return lengthOfTask;
* Called from ProgressBarDemo to find out how much has been done.
public int getCurrent() {
return current;
public void stop() {
current = lengthOfTask;
* Called from ProgressBarDemo to find out if the task has completed.
public boolean done() {
if (current >= lengthOfTask)
return true;
else
return false;
public String getMessage() {
return statMessage;
* The actual long running task. This runs in a SwingWorker thread.
class ActualTask {
ActualTask () {
current = -1;
statMessage = "";
resultStream = AIUtil.getInputStreamFromEncZip(cryptedFileNameAndPath); //here the decryption happens
current = 0;
statMessage = "";
}The code that calls decryption and displays waitWindow
final WaitSplash wS = new WaitSplash("Please wait...");
final DecryptFile cryptedTemplate = new DecryptFile (this.templateFile);
cryptedTemplate.go();
while (! cryptedTemplate.done()) {
try {
wait();
} catch (Exception e) { }
this.templateInputStream = cryptedTemplate.getDecryptedInputStream();
wS.close();Thanks, thanks, thanks in advance!
EdoardoMaybe you can try setting the priority of the long-running thread to be lower? so that the UI will be more responsive...
-
im using jdk 1.6 with java wtk 2.1
ya i know..
2.1 is a jdk1.4 source
but im using souce as 1.4 during compiliation so thats not the prob
this is my code
package org.learn;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Display;
public class thtest extends MIDlet
Thread t;
public void startApp()
Alert a=new Alert("hello");
a.setString("hello");
Alert b=new Alert("world");
b.setString("world");
Display d = Display.getDisplay(this );
d.setCurrent(a);
t=Thread.currentThread();
try{
t.sleep(10000);
catch (Exception e){}
d.setCurrent(b);
public void pauseApp()
public void destroyApp(boolean unconditional)
its just supposed to pause between the alerts using threads
however when i run it using the wtk, the emulator run properly but when i launch the app, it stops executing giving me this:
"Error verifying method org/learn/thtest startApp()V
Approximate bytecode offset 49: Inconsistent or missing stackmap at target
%the stack info%
Execution completed.
437782 bytecodes executed
9 thread switches
486 classes in the system (including system classes)
2506 dynamic objects allocated (73832 bytes)
2 garbage collections (60652 bytes collected)
Execution completed.
437782 bytecodes executed
9 thread switches
486 classes in the system (including system classes)
ALERT: java/lang/VerifyError: org/learn/thtest.
2506 dynamic objects allocated (73832 bytes)
2 garbage collections (60652 bytes collected)
please can someone help me out with this, is it an error on my part or do i have to set some option.Hi gandalf123,
First, Thread.sleep is a static method, so you don't need to create a Thread object to use it.
I think the problem is due to the fact you don't preverify your midlet.
More over, you don't need to double post your question. -
Problem with threads and camera.
Hi everybody!
I've a problem with taking snapshot.
I would like to display a loading screen after it take snapshot ( sometimes i
have to wait few seconds after i took snapshot. Propably photo is being taken in time where i have to wait).
I was trying to use threads but i didn't succeed.
I made this code:
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while((!performing.isShown()) && (backgroundCamera.isShown())){
Thread.yield();
notifyAll();
}).start();
new Thread(new Runnable(){
public void run() {
try {
this.wait();
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start();This code is sometimes showing performing screen but sometimes no.
I don't know why. In my opinion performing.isShown() method isn't working correctly.
Does anyone have some idea how to use threads here?Hi,
I've finally managed to work this fine.
The code:
Object o = new Object();
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while(!performing.isShown()){
Thread.yield();
synchronized(o) {
o.notify();
}).start();
new Thread(new Runnable(){
public void run() {
try {
synchronized(o) {
o.wait(1);
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start();
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