PB Java AWT SWT on Leopard Mac OS X 10.5.4 (9E17)

My configuration:
Mac OS X 10.5.4 (9E17)
java version "1.5.0_13"
Eclipse SDK Version: 3.3.1.1
Plugging: Leonardi 4.0
Eclipse run with -XstartonFirstThread
Pb AWT when I start Leonardi (This plugging run in Tiger)
I think the thread which manages the AWT window manager is blocked.
What is the solution ?
[email protected]

The way I use my huwaii modem which is an earlier model to the one you have is not to use any of the bundled apps that came from my provider I found them to be buggy.
All I needed to do was install the driver then use the macs built in internet connect in the network preferences.

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Java 6 not working on Mac OS X 10.5.8 on iMac8,1 intel Core 2 Duo

Posted: Mar 30, 2010 10:33 AM
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For some odd reason I cannot activate Java 6. I have installed all updates, up to Java for Mac OS X 10.5 Update 6, and the software update on the machine says that there are no further updates. Under Java preferences I have Java SE 6 64 bit on top, followed by J2SE 5.0 64-bit and then 32-bit, under plugins and under Java programs. I have also done the following:
cd /System/Library/Frameworks/JavaVM.framework/Versions
sudo rm -fr CurrentJDK
sudo ln -s 1.6 CurrentJDK
Then I do java -version:
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04-248-9M3125)
Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01-101, mixed mode)
So Java 6 seems to be there. However, when I run Safari, it only seems to know about Java 1.5.0_22. And under Safari installed plugins, there is nothing above 1.5.0_22. No 1.6. And if I uncheck Java 5 under Java preferences, Safari does not find any Java at all.
So where did my Java 6 go?

I can't access Leopard Mac now, but if I remember correctly Safari in Leopard is 32bit and can only use 32bit plugins. If there is only 64bit Java6, then I guess Safari can't use it.

JDK 1.4.2 java applet image printing on mac safari

Hi there,
I'm trying to implement printing inside java applet using javax.print package. I read an article somewhere about the package not working perfectly under mac, and a workaround is to use the old java.awt.print to get the print services, then use the DocPrintJob to print.
The SimpleDoc I use for capturing the image that I need to print works fine, and the printServices are there. The problem I have is it's giving me an 'invalid flavor' exception when clicking 'Print' on popup PrintDialog.
It seems that the mimetype is what's causing the problem, as the printer's supported mime type is "application/x-java-jvm-local-objectref". (note that, on PC the printing works fine, with Doc flavor mimetype as image/png and the image I need to print in png format). I tried switching the flavor to SERVICE_FORMATTED.RENDERABLE_IMAGE, printing an ImageDoc class which implements Doc and RenderableImage, but 'invalid flavor' exception still occurs.
I don't know much about printers on Mac, so I'm not sure what I can do about it, is it something that can be controlled from the Applet or it's something that the user has to set in the system - the Applet can only warn the user and tell the user to do the configuration.
Thanks in advance!

SwingUtilities.updateComponentTreeUI() works by first updating the UI of the given component, and then updating the component's children (and their children). So first it will update the JToolBar's UI (which installs the appropriate borders on its buttons), and then it will update each button's UI (which subsequently installs its own default border onto the button, undoing JToolBar's border installation, thanks to the bug mentioned previously).
Another possible work-around for this problem would be to write your own updateComponentTreeUI() method that updates the child components' UI's before updating the parent component's UI:public static void newUpdateComponentTreeUI(Component c)
 updateTreeUIs(c);
 c.invalidate();
 c.validate();
 c.repaint();
private static void updateTreeUIs(Component c)
 Component[] children = null;
 if (c instanceof JMenu) children = ((JMenu)c).getMenuComponents();
 else if (c instanceof Container) children = ((Container)c).getComponents();
 // Children first...
 for (int i=0; children != null && i < children.length; i++)
 updateTreeUIs(children);
 // Parent last...
 if (c instanceof JComponent) ((JComponent)c).updateUI();
}Not sure if this will present any other conflicts though.

Java Dialog focus issue with Mac OS X 10.4 (Mac OS X 10.3 is fine)

Hi,
I am trying this sample applet on 2 different Mac OS X's
1) Mac OS X 10.3.9
Safari 1.3.2 (v312.6)
JVM - 1.4.2_09
Here whenever the Browser, running the Applet comes on Top, the
Dialog also comes on Top i.e. if the dialog is hidden behind some window
& I click on the browser running the applet, the Dialog(showing "Hello",
"OK")
also becomes uncovered/visible.
2) Mac OS X 10.4.5
Safari 2.0.3 (v417.8)
JVM - 1.4.2_09
Here clicking on the Browser doesn't make the Dialog Visible.
As per the Java Docs, I think the Behaviour on OS X 10.3.9 is the
correct behaviour.
Is there a way to have that behaviour on OS X 10.4 - any workarounds,
anything I can do so that the dialog doesn't get hidden.
I cannot make the dialog modal.
Given below is the Applet source.
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class MyTest extends Applet implements ActionListener {
private Button b;
private Dialog myDialog;
public void init() {
b = new Button("Press me");
b.addActionListener(this);
add(b);
show();
private Frame findFrame(Component c) {
for (; c != null; c = c.getParent()) {
if (c instanceof Frame) return (Frame) c;
return null;
public void actionPerformed(ActionEvent e) {
if ( e.getSource() == b ) {
showDlg();
public void showDlg()
if(myDialog == null) {
// Set The Applet as owner
Frame f = findFrame(this);
if(f != null) {
System.out.println("Found Frame");
myDialog = new Dialog(f, false);
myDialog.add(new Label("Hello ") , BorderLayout.NORTH);
myDialog.add(new Button("OK"), BorderLayout.SOUTH);
myDialog.pack();
myDialog.show();
Mac Mini Mac OS X (10.4.6)

I used SBC DSL for a bit with my eMac on Panther without a hitch.
It is not that the service will not work, but their bundled software will not - not that you need it anyway.

HT5045 Is there a way to install older versions of Java, like Java 6 Update 26 on Mac OS X 10.7 ?

We have an application that worked fine on Java 6 Update 26. Update 29 broke the application. Even though we have fixed the problem, for people using older versions of the application, there is no recourse, if they have upgraded their OS to 10.7. So, is there a way to install Java 6 Update 26 on Mac OS X 10.7 ?

Hello,
I have a client that just started working remotely and needs to do payroll via her Mac OS X 10.7.5 system via a web browser. The payroll system appears to be ADP/Kronos as far as I can tell. We first tried using Safari and it said the plugin was missing so we downloaded the latest Java and installed. When we tried to run it dumped the following error. (see below)
At this point we decided to try Firefox and rather than a dump we found the message Java 1.6.0_07 required.
At this point we went hunting for an older version of Java and did find one only to be told if was specifically for OS X 10.5.x. My client is running OS X 10.7.5.
I have other clients running Windows that have multiple (older) versions of Java installed including 4, 5 and 6 all on one machine so I'm not sure if this is possible on Mac OS X or not.
Note I am not in charge of the payroll system and have no way of updating that side of things. I may recommend that my client contact her internal Help Desk or revert to using a Windows based system as I know for sure that would be capable of handling these requirements.
Thanks, Jason
Java 7 error
Initializing JVM for plug-in
JVM loading complete
Adding listener: quickfind.navLabel - [email protected]a6a8 - isPrinciple? true - isHost? false - isDialog? false - isAppletValid? true [1174251176] to com.kronos.wfc.platform.uiframework.applet.baseapplet.AppletEventManager@38ea76e6
Debug mode: false
Request made for a theme value with an invalid selector
Overriding LookAndFeel: Aqua
Setting LookAndFeel for root: sun.plugin2.main.client.PluginEmbeddedFrame[frame0,0,22,1900x902,invalid,layout=java.awt.BorderLayout,title=,resizable,normal]
Adding listener: superSummary.appletName - com.kronos.wfc.commonapp.genies.applet.manager.ManagerSummaryApplet@2c72bd07 - isPrinciple? true - isHost? false - isDialog? false - isAppletValid? true [745716999] to com.kronos.wfc.platform.uiframework.applet.baseapplet.AppletEventManager@39ac5a78
Debug mode: false
Request made for a theme value with an invalid selector
Overriding LookAndFeel: Aqua
Setting LookAndFeel for root: sun.plugin2.main.client.PluginEmbeddedFrame[frame2,61,203,1900x902,invalid,layout=java.awt.BorderLayout,title=,resizable,normal]

Program fails in Krb5LoginModule on Snow Leopard (Mac OS X 10.6)

Hi,
FWIW, I've already file a bug report with Apple for this, but maybe you can help me. We have a program that authenticates against Active Directory using Krb5LoginModule. It's been working for years under Mac OS X, Windows, Linux and FreeBSD, but under Snow Leopard (Mac OS X 10.6), using JRE 1.6.0_15 it fails with the following stack trace:
09:16:36,451 ERROR LoginDialog:225 - Password check failed: java.lang.IllegalArgumentException: EncryptionKey: Key bytes cannot be null!
 at sun.security.krb5.EncryptionKey.<init>(EncryptionKey.java:214)
 at sun.security.krb5.EncryptionKey.acquireSecretKeys(EncryptionKey.java:191)
 at sun.security.krb5.EncryptionKey.acquireSecretKeys(EncryptionKey.java:159)
 at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:665)
 at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:542)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
 at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
 at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)
 at java.security.AccessController.doPrivileged(Native Method)
 at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
 at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
 at de.unikoeln.rrz.uklanadmin.services.LoginService.checkPassword(LoginService.java:47)I've read the source and found that pre-auth works. Actually that's all we care about, we don't need the keys at all! But this call in Krb5LoginModule fails:
 // update keys after pre-auth
 encKeys = EncryptionKey.acquireSecretKeys(
 password, principal.getSalt());Please refer to http://openradar.appspot.com/radar?id=76405 for more details.

Thanks. I'd already set debug=true in the config file (and with map.put in your example). Apple does indeed use /Library/Preferences/edu.mit.Kerberos instead of /etc/krb5.conf. I can see that the settings there are picked up by programs I run in the Terminal, e.g. kinit. I'm not so sure they're picked up by the JDK. I have tried to set permitted_enctypes to just des-cbc-crc, but that didn't seem to have any effect.
As for your code example, the result is exactly the same (as I had expected). krb5.initialize() works fine, but in login(), at exactly the same spot in the source, I get exactly the same stack trace. For reference, it's this block in attemptAuthentication():
669 // We can't get the key from the keytab so prompt
670 if (encKeys == null) {
671 promptForPass(getPasswdFromSharedState);
672
673 encKeys = EncryptionKey.acquireSecretKeys(
674 password, principal.getSalt());
675
676 if (isInitiator) {
677 if (debug)
678 System.out.println("Acquire TGT using AS Exchange");
679 cred = Credentials.acquireTGT(principal,
680 encKeys, password);
681 // update keys after pre-auth
682 encKeys = EncryptionKey.acquireSecretKeys(password,
683 principal.getSalt());
684 }
685 }The call in line 673 succeeds, but the one in line 682 fails. The reason is in this method:
 182 public static EncryptionKey[] acquireSecretKeys(char[] password,
183 String salt, boolean pa_exists, int pa_etype, byte[] pa_s2kparams)
184 throws KrbExceptionThere it's this part:
204 EncryptionKey[] encKeys = new EncryptionKey[etypes.length];
205 for (int i = 0; i < etypes.length; i++) {
206 if (EType.isSupported(etypes)) {
207 encKeys[i] = new EncryptionKey(
208 stringToKey(password, salt, pa_s2kparams, etypes[i]),
209 etypes[i], null);
210 }For one of the values in etype[], the stringToKey method returns null. The source code is taken from OpenJDK. It's not available with Sun's JDK, so I haven't been able to step through that part in the debugger.
Edited by: TyrionLannister on Sep 18, 2009 2:21 AM (corrected a few mistakes)

Java on iBook running Leopard

I'm a teacher and we have to use a java app called PowerTeacher 1.1 Gradebook.
I am having trouble getting the app to run correctly on my own personal iBook. It will load and run correctly on a Windows desktop machine. Our IT guy in charge of getting Powergrade to work, isn't really interested in helping me because the district uses all Dell machines running Windows XP. He will only help me with Windows computer issues... not with anything on my own personal computer. Theoretically, java apps should run on either OS, right?
Any ideas or suggestions will be most appreciated.
The app will load, but all the features will not work. I can't add new assignments, view final grades, etc. Here is the error message I get:
java.lang.NullPointerException:
at org.xito.dialog.TableLayout.calculatePositions(TableLayout.java:729)
at org.xito.dialog.TableLayout.preferredLayoutSize(TableLayout.java:293)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at com.pearson.powerschool.gradebook.MainPanel.loadDetailPanel(MainPanel.java:444)
at com.pearson.powerschool.gradebook.BaseDetailPanel.loadDetailPanel(BaseDetailPan el.java:108)
at com.pearson.powerschool.gradebook.setup.GradingDetailPanel$1.reportingTermLoade d(GradingDetailPanel.java:49)
at com.pearson.powerschool.gradebook.setup.ReportingTermHandler.fireReportingTermL oadedEvent(ReportingTermHandler.java:30)
at com.pearson.powerschool.gradebook.setup.ReportingTermController.loadReportingTe rm(ReportingTermController.java:25)
at com.pearson.powerschool.gradebook.setup.MainGradingPanel$1.finished(MainGrading Panel.java:104)
at com.pearson.powerschool.gradebook.SDKClientTask$1.run(SDKClientTask.java:114)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at com.pearson.powerschool.gradebook.CustomEventQueue.dispatchEvent(CustomEventQue ue.java:19)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: 269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:19 0)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Dick,
First, thanks so much for your response.
Second, Where do you get the "patch"? I have to ask the IT in charge of Powerschool where to find the patch and beg him to install it. The school's official "platform" is Windows XP and will have to beg him to do this.
Third, I just installed Leopard 10.5.5 and the Powergrade java app still doesn't work correctly. The program files don't load completely. The program starts but it is not full functional.
Fourth, the program won't load at all on a Dell laptop, but will work on a Dell Desktop.
Fifth, I will ask the IT guy to contact powerschool tech support about this.
Sixth, once again thank you very much!

If Statement in java.awt paint

import java.applet.Applet; //bring in the applet class
import java.awt.*; //bring in the graphics class
import java.awt.event.*; //bring in the event class
import java.text.DecimalFormat; //bring in the decimal format class
import java.lang.Float; //bring in the float class
public class Bmi extends Applet implements ActionListener { //begin program and start ActionListener
Label weight, height; //define Label variable
TextField weighttext, heighttext; //define TextField variables
Button calculate; //define button variables
float index, wt, ht, max, min; //define float variables
DecimalFormat fmt2 = new DecimalFormat("#.00"); //set decimal format for reals
public void init() { //begin init()
weight = new Label("Please enter your weight in Kg. (2 decimal places): "); //define content of Label weight
weighttext = new TextField(6); //define size of TextField
height = new Label("Please enter your height in Metres (2 decimal places): "); //define content of Label height
heighttext = new TextField(5); //define size of TextField
calculate = new Button("Calculate!!"); //define content of Button
add(weight); //add Label weight to the GUI
add(weighttext); //add TextField weighttext to the GUI
add(height); //add Label height to the GUI
add(heighttext); //add TextField heighttext to the GUI
add(calculate); //add button calculate to the GUI
calculate.addActionListener(this); //wait for button to be returned
wt = 0; //reset wt to 0
index = 0; //reset index to 0
ht = 0; //reset ht to 0
max = 0; //reset max to 0
min = 0; //reset min to 0
public void actionPerformed( ActionEvent e ) { //run upon return of button
wt = Float.parseFloat(weighttext.getText()); //convert weighttext from String to Float
ht = Float.parseFloat(heighttext.getText()); //covert heighttext from String to Float
repaint(); //refresh paint area
public float indexer() //begin indexer method
 float ind; //delare local variable ind
 ind = wt/(ht*ht); //perform calculation
 return ind; //make indexer() the value of variable ind
} // end of indexer method
public float maxWeight() //begin maxWeight method
 float maxwt; //declare local variable maxwt
 final float UPPER = 25.0f; //declare variable UPPER as a float with a decimal value of 25.0
 maxwt = UPPER*ht*ht; //perform calculation
 return maxwt; //make maxWeight() the value of variable maxwt
} // end of maxWeight method
public float minWeight() //begin minWeight method
 float minwt; //declare local variable minwt
 final float LOWER= 20.0f; //declare variable LOWER as a float with a decimal value of 20.0
 minwt = LOWER*ht*ht; //perform calculation
 return minwt; //make minWeight() the value of variable minwt
} // end of minWeight method
public void paint(Graphics g) //begin paint method, define g as Graphics
 index=indexer(); //covert method indexer() to variable index
 max=maxWeight(); //convert method maxWeight() to variable max
 min=minWeight(); //convert method minWeight() to variable min
 g.setFont(new Font("Verdana", Font.ITALIC, 15)); //define font, weight and size
 g.setColor(new Color(90,90,90)); //set new colour
 g.drawRect(5,100,300,75); //define size of rectangle
 g.setColor(new Color(255,107,9)); //set new colour
 g.drawString("BMI is " + fmt2.format(index) + " for " + fmt2.format(wt) + "kg",20,120); //create string in paint, define its on screen position
 g.drawString("Maximum bodyweight is " + fmt2.format(max) + "kg", 20,140); //create string in paint, define its on screen position
 g.drawString("Minimum bodyweight is " + fmt2.format(min) + "kg", 20,160); //create string in paint, define its on screen position
} // end of paint method
} // end of Bmi classI have written the above code to calculate someones BMI (Body Mass Index). Basically as you can see it recieves a weight and height from the user and calculates the rest. But whilst that good I would like to know how I can make it tell the user something to the effect of "Your overweight" or "Your underweight". The if statement runs like this:
if (wt > max)This forum doesn't quite handle <> properly. The greater and less than symbols. So above you will see > this is the html character code for a greater than symbol so please read it as such.
And then if wt is greater than max then it will say "Your overweight".
But I can't figure out how to include it in the above program. Becuase it won't run in paint, atleast it won't the way I have done it previously. So can you think of any other ways?
Help much appreciated,
Simon

Thanks very much that works well.
Simon
My code now looks like this: import java.applet.Applet; //bring in the applet class
import java.awt.*; //bring in the graphics class
import java.awt.event.*; //bring in the event class
import java.text.DecimalFormat; //bring in the decimal format class
import java.lang.Float; //bring in the float class
public class Bmi extends Applet implements ActionListener { //begin program and start ActionListener
Label weight, height; //define Label variable
TextField weighttext, heighttext; //define TextField variables
Button calculate; //define button variables
float index, wt, ht, max, min; //define float variables
DecimalFormat fmt2 = new DecimalFormat("#.00"); //set decimal format for reals
public void init() { //begin init()
weight = new Label("Please enter your weight in Kg. (2 decimal places): "); //define content of Label weight
weighttext = new TextField(6); //define size of TextField
height = new Label("Please enter your height in Metres (2 decimal places): "); //define content of Label height
heighttext = new TextField(5); //define size of TextField
calculate = new Button("Calculate!!"); //define content of Button
add(weight); //add Label weight to the GUI
add(weighttext); //add TextField weighttext to the GUI
add(height); //add Label height to the GUI
add(heighttext); //add TextField heighttext to the GUI
add(calculate); //add button calculate to the GUI
calculate.addActionListener(this); //wait for button to be returned
wt = 0; //reset wt to 0
index = 0; //reset index to 0
ht = 0; //reset ht to 0
max = 0; //reset max to 0
min = 0; //reset min to 0
public void actionPerformed( ActionEvent e ) { //run upon return of button
wt = Float.parseFloat(weighttext.getText()); //convert weighttext from String to Float
ht = Float.parseFloat(heighttext.getText()); //covert heighttext from String to Float
repaint(); //refresh paint area
public float indexer() //begin indexer method
 float ind; //delare local variable ind
 ind = wt/(ht*ht); //perform calculation
 return ind; //make indexer() the value of variable ind
} // end of indexer method
public float maxWeight() //begin maxWeight method
 float maxwt; //declare local variable maxwt
 final float UPPER = 25.0f; //declare variable UPPER as a float with a decimal value of 25.0
 maxwt = UPPER*ht*ht; //perform calculation
 return maxwt; //make maxWeight() the value of variable maxwt
} // end of maxWeight method
public float minWeight() //begin minWeight method
 float minwt; //declare local variable minwt
 final float LOWER= 20.0f; //declare variable LOWER as a float with a decimal value of 20.0
 minwt = LOWER*ht*ht; //perform calculation
 return minwt; //make minWeight() the value of variable minwt
} // end of minWeight method
public void you(Graphics g)
String statement;
if(wt > max) statement="You are very fat";
else if(wt < min) statement="You are very thin";
else statement="You are in the recommended weight range for your height";
g.drawString(statement, 20,210);
public void paint(Graphics g) //begin paint method, define g as Graphics
 you(g);
 index=indexer(); //covert method indexer() to variable index
 max=maxWeight(); //convert method maxWeight() to variable max
 min=minWeight(); //convert method minWeight() to variable min
 g.setFont(new Font("Verdana", Font.ITALIC, 15)); //define font, weight and size
 g.setColor(new Color(90,90,90)); //set new colour
 g.drawRect(5,100,300,75); //define size of rectangle
 g.setColor(new Color(255,107,9)); //set new colour
 g.drawString("BMI is " + fmt2.format(index) + " for " + fmt2.format(wt) + "kg",20,120); //create string in paint, define its on screen position
 g.drawString("Maximum bodyweight is " + fmt2.format(max) + "kg", 20,140); //create string in paint, define its on screen position
 g.drawString("Minimum bodyweight is " + fmt2.format(min) + "kg", 20,160); //create string in paint, define its on screen position
} // end of paint method
} // end of BmiThanks again,
Simon

Firefox hangs on opening requiring force quit I have snow leopard mac It hangs when I try safe mode. I need to know how to remove all traces of firefox on my mac so I can reinstall. I have tried terminal as advised on firefox webpage. Please advise m

Firefox hangs on opening requiring force quit I have snow leopard Mac It even hangs when I try safe mode. I need to know how to remove all traces of firefox on my mac so I can reinstall. I have tried terminal as advised on firefox webpage. Please advise me
== This happened ==
Every time Firefox opened
== I tried to update firefox add-ons ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7

Try a new profile. See [[Recovering important data from an old profile]]

Can I build a GUI application with SWING only without [import java.awt.*;]

I have seen several threads (in forums), books and tutorials about SWING and I see that they all mix SWING with AWT (I mean they import both Swing and AWT in their code).
The conclusion that comes out is:
It is good to learn about SWING and forget AWT as it won't be supported later. I have decided to do so, and I never include <<import java.awt.*;>> in my code.
But I see that you cannot do much without <<import java.awt.*;>>. For example this line which changes the background color:
<<frame.getContentPane().setBackground(Color.red)>>
works only with <<import java.awt.*;>>. I have seen that codes in this and other forums import awt to change the background. Why is that?
After all, I wonder, what can I do;
My question is, can I change the background (and of course do all other things listener, buttons etc) without using <<import java.awt.*;>>.
I would like to avoid using <<import java.awt.*;>> and using awt since my program will not work later.
In addition, I believe there is no point to learn awt, which later will not exist.
I know, I must have misunderstood something. I would appreceate it very much, if anyone could give me even a short answer.
Thank you in advance,
JMelsi

Since swing is a layer on top of awt, AWT will exist for as long as swing does.
If sun does ever remove AWT they will have to replace it something else swing can layer on to and you will probably only have to replace your import statements.
The main difference is the way there drawn to the screen.
You can do custom drawing on swing components but you can't on AWT.
If your using a desktop PC system it's probably best to use swing just in case you wish to do some custom drawing.
awt uses less memory than swing and is faster but swing can be extended. awt comes only as standard.
Say for example you wish to implement a JButton with a ProgressBar below the button text, this can be done with swing!

The method add() in java.awt.Container made me in confuse

Here is my two java code file:
//MyContainer.java
package sam.gui;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JApplet;
import javax.swing.JFrame;
public class MyContainer extends JApplet {
 private MyButton[] myButton = new MyButton[2];
 private static int counter = 0;
 public MyContainer() {
 myButton[0] = new MyButton(5, 5, 200, 30);
 myButton[1] = new MyButton(5, 40, 200, 30);
 for (int i = 0; i < myButton.length; i++) {
 add(myButton);
 public void paint(Graphics g) {
 for (int i = 0; i < myButton.length; i++) {
 System.out.println("MyButton : " + (i+1));
 myButton[i].draw(g);
 public static void main(String[] args) {
 MyContainer container = new MyContainer();
 JFrame f = new JFrame();
 f.getContentPane().add(container);
 f.pack();
 f.setSize(new Dimension(300, 200));
 f.show();
//MyButton.java
package sam.gui;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
public class MyButton extends Component {
 private Color m_rectColor = new Color(128, 73, 0);
 public MyButton(int x, int y, int width, int height) {
 setBounds(x, y, width, height);
 public void draw(Graphics g) {
 Graphics2D g2 = (Graphics2D)g;
 g.setColor(m_rectColor);
 g.fillRect(0, 0,
 getBounds().width, getBounds().height);
 System.out.println("x = " + getBounds().x);
 System.out.println("y = " + getBounds().y);
 System.out.println("width = " + getBounds().width);
 System.out.println("height = " + getBounds().height);
I thinked the runned result should be below:
MyButton : 1
x = 5
y = 5
width = 200
height = 30
MyButton : 2
x = 5
y = 40
width = 200
height = 30But in fact, its result is here:
MyButton : 1
x = 5
y = 5
width = 200
height = 30
MyButton : 2
x = 0
y = 0
width = 292
height = 173I don't know why the result would like this? I have used add(...) method to add two component MyButton to the container MyContainer, But the bounds of the second component is not I want.
So this problem made me go into confuse.

You need to learn how layout managers work. The default layout manager of a JApplet and JFrame is BorderLayout .
/Kaj

Using List Class in java.awt / java.util ?

have a program that:
import java.util.*;
List list = new LinkedList();
list = new ArrayList();
... read a file and add elements to array
use a static setter
StaticGettersSetters.setArray(list);
next program:
import java.awt.*;
public static java.util.List queryArray =
StaticGettersSetters.getArray();
If I don't define queryArray with the package and class, the compiler
gives an error that the List class in java.awt is invalid for queryArray.
If I import the util package, import java.util.*; , the compiler
gives an error that the list class is ambiguous.
Question:
If you using a class that exists in multiple packages, is the above declaration of queryArray the only way to declare it ?
Just curious...
Thanks for your help,
YAM-SSM

So what you have to do is explicitly tell the compiler which one you really want by spelling out the fully-resolved class name:
import java.awt.*;
import java.sql.*;
import java.util.*;
public class ClashTest
    public static void main(String [] args)
        java.util.Date today    = new java.util.Date();
        java.util.List argsList = Arrays.asList(args);
        System.out.println(today);
        System.out.println(argsList);
}No problems here. - MOD

Custom graphics in java.awt.ScrollPane

Hi all,
I have to draw a custom created image in a scroll pane. As the image is very large I want to display it in a scroll pane. As parts of the image may change within seconds, and drawing the whole image is very time consuming (several seconds) I want to draw only the part of the image that is currently visible to the user.
My idea: creating a new class that extends from java.awt.ScrollPane, overwrite the paint(Graphics) method and do the drawings inside. Unfortunately, it does not work. The background of the scoll pane is blue, but it does not show the red box (the current viewport is not shown in red).
Below please find the source code that I am using:
package graphics;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.ScrollPane;
import java.awt.event.AdjustmentEvent;
public class CMyComponent extends ScrollPane {
 /** Listener to force a component to repaint when a scroll bar changes its
 * position.
 private final class ScrollBarAdjustmentListener implements java.awt.event.AdjustmentListener {
 /** The component to force to repaint. */
 private final Component m_Target;
 /** Default constructor.
 * @param Target The component to force to repaint.
 private ScrollBarAdjustmentListener(Component Target) { m_Target = Target; }
 /** Forces to component to repaint upon adjustment of the scroll bar.
 * @see java.awt.event.AdjustmentListener#adjustmentValueChanged(java.awt.event.AdjustmentEvent)
 public void adjustmentValueChanged(AdjustmentEvent e) { m_Target.paint(m_Target.getGraphics()); }
 public CMyComponent() {
 // Ensure that the component repaints upon changing of the scroll bars
 ScrollBarAdjustmentListener sbal = new ScrollBarAdjustmentListener(this);
 getHAdjustable().addAdjustmentListener(sbal);
 getVAdjustable().addAdjustmentListener(sbal);
 public void paint(Graphics g) {
 setBackground(Color.BLUE);
 g.setColor(Color.RED);
 g.fillRect(getScrollPosition().x, getScrollPosition().y, getViewportSize().width, getViewportSize().height);
 public final static void main(String[] args) {
 java.awt.Frame f = new java.awt.Frame();
 f.add(new CMyComponent());
 f.pack();
 f.setVisible(true);
}

Dear all,
I used the last days and tried several things. I think now I have a quite good working solution (just one bug remains) and it is very performant. To give others a chance to see what I have done I post the source code of the main class (a canvas drawing and implementing scrolling) here. As soon as the sourceforge project is accepted, I will publish the whole sources at there. Enjoy. And if you have some idea for my last bug in getElementAtPixel(Point), then please tell me.
package internetrail.graphics.hexgrid;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;
import java.util.WeakHashMap;
import java.util.Map;
/** Hex grid view.
* Visualizes a {@link IHexGridModel}.
* @version 0.1, 03.06.2006
* @author Bjoern Wuest, Germany
public final class CHexGridView extends Canvas implements ComponentListener, IHexGridElementListener {
 /** Serial version unique identifier. */
 private static final long serialVersionUID = -965902826101261530L;
 /** Instance-constant parameter for the width of a hex grid element. */
 public final int CONST_Width;
 /** Instance-constant parameter for 1/4 of the width of a hex grid element. */
 public final int CONST_Width1fourth;
 /** Instance-constant parameter for 3/4 of the width of a hex grid element. */
 public final int CONST_Width3fourth;
 /** Instance-constant parameter for 1.5 times of the width of a hex grid element. */
 public final int CONST_Width1dot5;
 /** Instance-constant parameter for 4 times of the width of a hex grid element. */
 public final int CONST_Widthquad;
 /** Instance-constant parameter for the height of a hex grid element. */
 public final int CONST_Height;
 /** Instance-constant parameter for 1/2 of the height of a hex grid element. */
 public final int CONST_Heighthalf;
 /** Instance-constant parameter for the double height of a hex grid element. */
 public final int CONST_Heightdouble;
 /** The steepness of a side of the hex grid element (calculated for the upper left arc). */
 public final double CONST_Steepness;
 /** The model of this hex grid */
 private final IHexGridModel m_Model;
 /** A cache for already created images of the hex map. */
 private final Map<Point, Image> m_Cache = new WeakHashMap<Point, Image>();
 /** The graphical area to draw the selection ring around a hex element. */
 private final Area m_SelectionRing;
 /** The image of the selection ring around a hex element. */
 private final BufferedImage m_SelectionRingImage;
 /** The current position of the hex grid in pixels (top left visible corner). */
 private Point m_ScrollPosition = new Point(0, 0);
 /** Flag to define if a grid is shown ({@code true}) or not ({@code false}). */
 private boolean m_ShowGrid = true;
 /** Flag to define if the selected hex grid element should be highlighted ({@code true}) or not ({@code false}). */
 private boolean m_ShowSelected = true;
 /** The offset of hex grid elements shown on the screen, measured in hex grid elements. */
 private Point m_CurrentOffset = new Point(0, 0);
 /** The offset of the image shown on the screen, measured in pixels. */
 private Point m_PixelOffset = new Point(0, 0);
 /** The index of the currently selected hex grid element. */
 private Point m_CurrentSelected = new Point(0, 0);
 /** The width of a buffered pre-calculated image in pixel. */
 private int m_ImageWidth;
 /** The height of a buffered pre-calculated image in pixel. */
 private int m_ImageHeight;
 /** The maximum number of columns of hex grid elements to be shown at once on the screen. */
 private int m_MaxColumn;
 /** The maximum number of rows of hex grid elements to be shown at once on the screen. */
 private int m_MaxRow;
 /** Create a new hex grid view.
 * The hex grid view is bound to a {@link IHexGridModel} and registers at
 * that model to listen for {@link IHexGridElement} updates.
 * @param Model The model backing this view.
 public CHexGridView(IHexGridModel Model) {
 // Set the model
 m_Model = Model;
 CONST_Width = m_Model.getElementsWidth();
 CONST_Height = m_Model.getElementsHeight();
 CONST_Width1fourth = CONST_Width/4;
 CONST_Width3fourth = CONST_Width*3/4;
 CONST_Width1dot5 = CONST_Width*3/2;
 CONST_Heighthalf = CONST_Height/2;
 CONST_Widthquad = CONST_Width*4;
 CONST_Heightdouble = CONST_Height*2;
 CONST_Steepness = (double)CONST_Heighthalf / CONST_Width1fourth;
 m_ImageWidth = getSize().width+CONST_Widthquad;
 m_ImageHeight = getSize().height+CONST_Heightdouble;
 m_MaxColumn = m_ImageWidth / CONST_Width3fourth;
 m_MaxRow = m_ImageHeight / CONST_Height;
 // Register this canvas for various notifications
 m_Model.addElementListener(this);
 addComponentListener(this);
 // Create the selection ring to highlight hex grid elements
 m_SelectionRing = new Area(new Polygon(new int[]{-1, CONST_Width1fourth-1, CONST_Width3fourth+1, CONST_Width+1, CONST_Width3fourth+1, CONST_Width1fourth-1}, new int[]{CONST_Heighthalf, -1, -1, CONST_Heighthalf, CONST_Height+1, CONST_Height+1}, 6));
 m_SelectionRing.subtract(new Area(new Polygon(new int[]{2, CONST_Width1fourth+2, CONST_Width3fourth-2, CONST_Width-2, CONST_Width3fourth-2, CONST_Width1fourth+2}, new int[]{CONST_Heighthalf, 2, 2, CONST_Heighthalf, CONST_Height-2, CONST_Height-2}, 6)));
 m_SelectionRingImage = new BufferedImage(CONST_Width, CONST_Height, BufferedImage.TYPE_INT_ARGB);
 Graphics2D g = m_SelectionRingImage.createGraphics();
 g.setColor(Color.WHITE);
 g.fill(m_SelectionRing);
 @Override public synchronized void paint(Graphics g2) {
 // Caculate the offset of indexes to show
 int offsetX = 2 * (m_ScrollPosition.x / CONST_Width1dot5) - 2;
 int offsetY = (int)(Math.ceil(m_ScrollPosition.y / CONST_Height) - 1);
 m_CurrentOffset = new Point(offsetX, offsetY);
 // Check if the image is in the cache
 Image drawing = m_Cache.get(m_CurrentOffset);
 if (drawing == null) {
 // The image is not cached, so draw it
 drawing = new BufferedImage(m_ImageWidth, m_ImageHeight, BufferedImage.TYPE_INT_ARGB);
 Graphics2D g = ((BufferedImage)drawing).createGraphics();
 // Draw background
 g.setColor(Color.BLACK);
 g.fillRect(0, 0, m_ImageWidth, m_ImageHeight);
 // Draw the hex grid
 for (int column = 0; column <= m_MaxColumn; column += 2) {
 for (int row = 0; row <= m_MaxRow; row++) {
 // Draw even column
 IHexGridElement element = m_Model.getElementAt(offsetX + column, offsetY + row);
 if (element != null) { g.drawImage(element.getImage(m_ShowGrid), (int)(column*(CONST_Width3fourth-0.5)), CONST_Height*row, null); }
 // Draw odd column
 element = m_Model.getElementAt(offsetX + column+1, offsetY + row);
 if (element!= null) { g.drawImage(element.getImage(m_ShowGrid), (int)(column*(CONST_Width3fourth-0.5)+CONST_Width3fourth), CONST_Heighthalf*(row*2+1), null); }
 // Put the image into the cache
 m_Cache.put(m_CurrentOffset, drawing);
 // Calculate the position of the image to show
 offsetX = CONST_Width1dot5 + (m_ScrollPosition.x % CONST_Width1dot5);
 offsetY = CONST_Height + (m_ScrollPosition.y % CONST_Height);
 m_PixelOffset = new Point(offsetX, offsetY);
 g2.drawImage(drawing, -offsetX, -offsetY, null);
 // If the selected element should he highlighted, then do so
 if (m_ShowSelected) {
 // Check if the selected element is on screen
 if (isElementOnScreen(m_CurrentSelected)) {
 // Correct vertical offset for odd columns
 if ((m_CurrentSelected.x % 2 == 1)) { offsetY -= CONST_Heighthalf; }
 // Draw the selection circle
 g2.drawImage(m_SelectionRingImage, (m_CurrentSelected.x - m_CurrentOffset.x) * CONST_Width3fourth - offsetX - ((m_CurrentSelected.x + 1) / 2), (m_CurrentSelected.y - m_CurrentOffset.y) * CONST_Height - offsetY, null);
 @Override public synchronized void update(Graphics g) { paint(g); }
 public synchronized void componentResized(ComponentEvent e) {
 // Upon resizing of the component, adjust several pre-calculated values
 m_ImageWidth = getSize().width+CONST_Widthquad;
 m_ImageHeight = getSize().height+CONST_Heightdouble;
 m_MaxColumn = m_ImageWidth / CONST_Width3fourth;
 m_MaxRow = m_ImageHeight / CONST_Height;
 // And flush the cache
 m_Cache.clear();
 public void componentMoved(ComponentEvent e) { /* do nothing */ }
 public void componentShown(ComponentEvent e) { /* do nothing */ }
 public void componentHidden(ComponentEvent e) { /* do nothing */ }
 public synchronized void elementUpdated(IHexGridElement Element) {
 // Clear cache where the element may be contained at
 for (Point p : m_Cache.keySet()) { if (isElementInScope(Element.getIndex(), p, new Point(p.x + m_MaxColumn, p.y + m_MaxRow))) { m_Cache.remove(p); } }
 // Update the currently shown image if the update element is shown, too
 if (isElementOnScreen(Element.getIndex())) { repaint(); }
 /** Returns the model visualized by this grid view.
 * @return The model visualized by this grid view.
 public IHexGridModel getModel() { return m_Model; }
 /** Returns the current selected hex grid element.
 * @return The current selected hex grid element.
 public IHexGridElement getSelected() { return m_Model.getElementAt(m_CurrentSelected.x, m_CurrentSelected.y); }
 /** Sets the current selected hex grid element by its index.
 * If the selected hex grid element should be highlighted and is currently
 * shown on the screen, then this method will {@link #repaint() redraw} this
 * component automatically.
 * @param Index The index of the hex grid element to become the selected one.
 * @throws IllegalArgumentException If the index refers to a non-existing hex
 * grid element.
 public synchronized void setSelected(Point Index) throws IllegalArgumentException {
 // Check that the index is valid
 if ((Index.x < 0) || (Index.y < 0) || (Index.x > m_Model.getXElements()) || (Index.y > m_Model.getYElements())) { throw new IllegalArgumentException("There is no hex grid element with such index."); }
 m_CurrentSelected = Index;
 // If the element is on screen and should be highlighted, then repaint
 if (m_ShowSelected && isElementOnScreen(m_CurrentSelected)) { repaint(); }
 /** Moves the visible elements to the left by the number of pixels.
 * To move the visible elements to the left by one hex grid element, pass
 * {@link #CONST_Width3fourth} as the parameter. The component will
 * automatically {@link #repaint()}.
 * @param Pixels The number of pixels to move to the left.
 * @return The number of pixels moved to the left. This is always between 0
 * and {@code abs(Pixels)}.
 public synchronized int moveLeft(int Pixels) {
 int delta = m_ScrollPosition.x - Math.max(0, m_ScrollPosition.x - Math.max(0, Pixels));
 if (delta != 0) {
 m_ScrollPosition.x -= delta;
 repaint();
 return delta;
 /** Moves the visible elements up by the number of pixels.
 * To move the visible elements up by one hex grid element, pass {@link
 * #CONST_Height} as the parameter. The component will automatically {@link
 * #repaint()}.
 * @param Pixels The number of pixels to move up.
 * @return The number of pixels moved up. This is always between 0 and {@code
 * abs(Pixels)}.
 public synchronized int moveUp(int Pixels) {
 int delta = m_ScrollPosition.y - Math.max(0, m_ScrollPosition.y - Math.max(0, Pixels));
 if (delta != 0) {
 m_ScrollPosition.y -= delta;
 repaint();
 return delta;
 /** Moves the visible elements to the right by the number of pixels.
 * To move the visible elements to the right by one hex grid element, pass
 * {@link #CONST_Width3fourth} as the parameter. The component will
 * automatically {@link #repaint()}.
 * @param Pixels The number of pixels to move to the right.
 * @return The number of pixels moved to the right. This is always between 0
 * and {@code abs(Pixels)}.
 public synchronized int moveRight(int Pixels) {
 int delta = Math.min(m_Model.getXElements() * CONST_Width3fourth + CONST_Width1fourth - getSize().width, m_ScrollPosition.x + Math.max(0, Pixels)) - m_ScrollPosition.x;
 if (delta != 0) {
 m_ScrollPosition.x += delta;
 repaint();
 return delta;
 /** Moves the visible elements down by the number of pixels.
 * To move the visible elements down by one hex grid element, pass {@link
 * #CONST_Height} as the parameter. The component will automatically {@link
 * #repaint()}.
 * @param Pixels The number of pixels to move down.
 * @return The number of pixels moved down. This is always between 0 and
 * {@code abs(Pixels)}.
 public synchronized int moveDown(int Pixels) {
 int delta = Math.min(m_Model.getYElements() * CONST_Height + CONST_Heighthalf - getSize().height, m_ScrollPosition.y + Math.max(0, Pixels)) - m_ScrollPosition.y;
 if (delta != 0) {
 m_ScrollPosition.y += delta;
 repaint();
 return delta;
 /** Checks if the hex grid element of the given index is currently
 * displayed on the screen (even just one pixel).
 * The intention of this method is to check if a {@link #repaint()} is
 * necessary or not.
 * @param ElementIndex The index of the element to check.
 * @return {@code true} if the hex grid element of the given index is
 * displayed on the screen, {@code false} if not.
 public synchronized boolean isElementOnScreen(Point ElementIndex) { return isElementInScope(ElementIndex, m_CurrentOffset, new Point(m_CurrentOffset.x + m_MaxColumn, m_CurrentOffset.y + m_MaxRow)); }
 /** Checks if the hex grid element of the given index is within the given
 * indexes.
 * The intention of this method is to check if a {@link #repaint()} is
 * necessary or not.
 * @param ElementIndex The index of the element to check.
 * @param ReferenceIndexLeftTop The left top index of the area to check.
 * @param ReferenceIndexRightBottom The right bottom index of the area to check.
 * @return {@code true} if the hex grid element of the given index is within
 * the given area, {@code false} if not.
 public synchronized boolean isElementInScope(Point ElementIndex, Point ReferenceIndexLeftTop, Point ReferenceIndexRightBottom) { if ((ElementIndex.x >= ReferenceIndexLeftTop.x) && (ElementIndex.x <= ReferenceIndexRightBottom.x) && (ElementIndex.y >= ReferenceIndexLeftTop.y) && (ElementIndex.y <= (ReferenceIndexRightBottom.y))) { return true; } else { return false; } }
 /** Return the {@link IHexGridElement hex grid element} shown at the given
 * pixel on the screen.
 * Remark: There seems to be a bug in retrieving the proper element,
 * propably caused by rounding errors and unprecise pixel calculations.
 * @param P The pixel on the screen.
 * @return The {@link IHexGridElement hex grid element} shown at the pixel.
 public synchronized IHexGridElement getElementAtPixel(Point P) {
 // @FIXME Here seems to be some bugs remaining
 int dummy = 0; // Variable for warning to indicate that there is something to do :)
 // Calculate the pixel on the image, not on the screen
 int px = P.x + m_PixelOffset.x;
 int py = P.y + m_PixelOffset.y;
 // Determine the x-index of the column (is maybe decreased by one)
 int x = px / CONST_Width3fourth + m_CurrentOffset.x;
 // If the column is odd, then shift the y-pixel by half element height
 if ((x % 2) == 1) { py -= CONST_Heighthalf; }
 // Determine the y-index of the row (is maybe decreased by one)
 int y = py / CONST_Height + m_CurrentOffset.y;
 // Normative coordinates to a single element
 px -= (x - m_CurrentOffset.x) * CONST_Width3fourth;
 py -= (y - m_CurrentOffset.y) * CONST_Height;
 // Check if the normative pixel is in the first quarter of a column
 if (px < CONST_Width1fourth) {
 // Adjustments to the index may be necessary
 if (py < CONST_Heighthalf) {
 // We are in the upper half of a hex-element
 double ty = CONST_Heighthalf - CONST_Steepness * px;
 if (py < ty) { x--; }
 } else {
 // We are in the lower half of a hex-element
 double ty = CONST_Heighthalf + CONST_Steepness * px;
 if (py > ty) {
 x--;
 y++;
 return m_Model.getElementAt(x, y);
}Ah, just to give you some idea: I use this component to visualize a hex grid map with more than 1 million grid elements. And it works, really fast, and requires less than 10 MByte of memory.

Useless code in java.awt.image.SampleModel.java?

Hey there,
i just looked up the sourcecode of java.awt.image.SampleModel.java in JDK 6
I discovered two issues i'd like to discuss.
1) on lines 736 to 739 this code is stated:
if (iArray != null)
pixels = iArray;
else
pixels = new int[numBands * w * h];
I asked myself, why does this code exist? while the getPixels() method is overwritten twice by double[] getPixels() and float[] getPixels, it is impossible to reach the part of the java code that initializes the pixels-array. One could only step into that line if "null" is given for the i/d/fArray-parameter. but if one would do so, the Java parser couldn't determine, which method is to use. so this part of code is just useless IMHO.
the java developers could get a little more performance out of this method if the if statement would be cut out - especially when reading a lot of very small rasters
or, on the other hand, they could replace this piece of code by an explicit bounds check.
When somebody touches this code, i would appreciate it if the errormessage "index out of bounds!" could be rewritten to be a little more verbose, like: Index out of bounds(x=123; y=456, maxX=100, maxY=400)!(numbers are just examples)
I hope i didn't miss something very basic and could help improving this class a little bit.
2) the local variable Offset(line 734) is coded against code conventions which say, variables shall start with a lowercase letter. Offset obviously doesn't fit that convention.
best regards
kdot

One could only step into that line if "null" is given for the i/d/fArray-parameter. but if one would do so, the Java parser couldn't determine, which method is to use. so this part of code is just useless IMHO. You can have
sampleModel.getPixels(x,y,w,h,(int[]) null, dataBuffer);No ambiguity on which method to use.
the local variable Offset(line 734) is coded against code conventions which say, variables shall start with a lowercase letter. Offset obviously doesn't fit that convention. You're correct, offset is against coding conventions. So are many other examples scattered throughout the jdk source code. For example, Hashtable should be called HashTable. In some cases the coding conventions might not have been established when the original code was written. In other cases it might have been human error. In yet other cases the conventions were probably ignored. The person who wrote the SampleModel class did so some 10+ years ago (Java 1.2). Who knows what he/she was thinking at the time, and in all honesty - does it really matter in this case?
Did you know there are some classes that declare unused local variables (ahem ColorConvertOp)? Some also have unused imports ( *** cough *** BufferedImage *** cough *** ). In essence, the jdk source code is not the epidemy of code correctness. But it's still pretty good.

OutOfMemory error in java.awt.image.DataBufferInt. init

We have an applet application that performs Print Preview of the images in the canvas. The images are like a network of entities (it has pictures of the entities involve (let's say Person) and how it links to other entities). We are using IE to launch the applet.
We set min heap space to 128MB, JVM max heap space to 256MB, java plugin max heap space to 256MB using the Control Panel > Java.
When the canvas width is about 54860 and height is 1644 and perform Print Preview, it thows an OutOfMemoryError in java.awt.image.DataBufferInt.<int>, hence, the Print Preview page is not shown. The complete stack trace (and logs) is as follows:
Width: 54860 H: 1644
Max heap: 254 # using Runtime.getRuntime().maxMemory()
javaplugin.maxHeapSize: 256M # using System.getProperties("javaplugin.maxHeapSize")
n page x n page : 1x1
Exception in thread "AWT-EventQueue-2" java.lang.OutOfMemoryError: Java heap space
 at java.awt.image.DataBufferInt.<init>(Unknown Source)
 at java.awt.image.Raster.createPackedRaster(Unknown Source)
 at java.awt.image.DirectColorModel.createCompatibleWritableRaster(Unknown Source)
 at java.awt.image.BufferedImage.<init>(Unknown Source)
 at com.azeus.gdi.chart.GDIChart.preparePreview(GDIChart.java:731)
 at com.azeus.gdi.chart.GDIChart.getPreview(GDIChart.java:893)
 at com.azeus.gdi.ui.GDIUserInterface.printPreviewOp(GDIUserInterface.java:1526)
 at com.azeus.gdi.ui.GDIUserInterface$21.actionPerformed(GDIUserInterface.java:1438)
 at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
 at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
 at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
 at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
 at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
 at java.awt.Component.processMouseEvent(Unknown Source)
 at javax.swing.JComponent.processMouseEvent(Unknown Source)
 at java.awt.Component.processEvent(Unknown Source)
 at java.awt.Container.processEvent(Unknown Source)
 at java.awt.Component.dispatchEventImpl(Unknown Source)
 at java.awt.Container.dispatchEventImpl(Unknown Source)
 at java.awt.Component.dispatchEvent(Unknown Source)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
 at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
 at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
 at java.awt.Container.dispatchEventImpl(Unknown Source)
 at java.awt.Component.dispatchEvent(Unknown Source)
 at java.awt.EventQueue.dispatchEvent(Unknown Source)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.run(Unknown Source)
Drilling down the cause of the problem. The OutOfMemory occurred in the constructor of DataBufferInt when it tried to create an int array:
public DataBufferInt(int size) {
super(STABLE, TYPE_INT, size);
data = new int[size]; # this part produce out of memory error when size = width X height
bankdata = new int[1][];
bankdata[0] = data;
The OutOfMemory error occurred when size is width * height (54860 X 1644) which is 90,189,840 bytes (~86MB).
I can replicate the OutOfMemory error when initiating an int array using a test class when it uses the default max heap space but if I increase the heap space to 256MB, it cannot be replicated in the test class.
Using a smaller width and height with product not exceeding 64MB, the applet can perform Print Preview successfully.
Given this, I think the java applet is not using the value assigned in javaplugin.maxHeapSize to set the max heap space, hence, it still uses the default max heap size and throws OutOfMemory in int array when size exceeds the default max heap space which is 64MB.
For additional information, below is some of the java properties (when press S in java applet console):
browser = sun.plugin
browser.vendor = Sun Microsystems, Inc.
browser.version = 1.1
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\PROGRA~1\Java\jre6\classes
java.class.version = 50.0
java.class.version.applet = true
java.runtime.name = Java(TM) SE Runtime Environment
java.runtime.version = 1.6.0_17-b04
java.specification.version = 1.6
java.vendor.applet = true
java.version = 1.6.0_17
java.version.applet = true
javaplugin.maxHeapSpace = 256M
javaplugin.nodotversion = 160_17
javaplugin.version = 1.6.0_17
javaplugin.vm.options = -Xms128M -Djavaplugin.maxHeapSpace=256M -Xmx256m -Xms128M
javawebstart.version = javaws-1.6.0_17
Kindly advise if this is a bug in JRE or wrong setting. If wrong setting, please advise on the proper way to set the heap space to prevent OutOfMemory in initializing int array.
Thanks a lot.
Edited by: rei_xanther on Jun 28, 2010 12:01 AM
Edited by: rei_xanther on Jun 28, 2010 12:37 AM

rei_xanther wrote:
..But the maximum value of the int data type is 2,147,483,647. That is the maximum positive integer value that can be stored in (the 4 bytes of) a signed int, but..
..The value that I passed in the int array size is only 90,189,840...its only connection with RAM is that each int requires 4 bytes of memory to hold it.
new int[size] -- size is 90,189,840Sure. So the number of bytes required to hold those 90,189,840 ints is 360,759,360.
I assumed that one element in the int array is 1 byte. ..Your assumption is wrong. How could it be possible to store 32 bits (4 bytes) in 8 bits (1 byte)? (a)
a) Short of some clever compression algorithm applied to the data.

PB Java AWT SWT on Leopard Mac OS X 10.5.4 (9E17)

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