Collaborative work environment with JAVA Applet

Helo all, how can I use JAVA Applets to establish a collaborative work environment?
If anyone knows some resources that can help me, I'll be greatfull for him/her.

Java 2D provides the class java.awt.image.ConvolveOp that can be used to blur. This tutorial provides an example and code. Select "Convolve: Low Pass" display of the picture of the building to see the effect.
[http://java.sun.com/docs/books/tutorial/2d/images/drawimage.html]

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Problems with Java Applets

Ever since upgrading to 10.5.2 I have been having trouble with sites with java applets. I like to play bridge on Pogo, but sometimes the game room will not open and at other times I get messages advising me to check the URL or go back to home page. I have tried emptying the cache, repairing permissions and a few other tips I have seen on this forum, but the problem persists.

I decided to take a look, but the Bridge program requires a signup. Not interested, but the free Poppit game plays fine as a guest on my machine on both Safari 3.1 and FireFox 3.0b4.
With FireFox I'm running AdBlock Plus, which can create problems with some sites, but the games loaded and played.
Based on this, I'd check the time of day you are trying to use their site and see if there are more problems with certain times.

On certain web sites(with java applets embedded or rich content),sometimes browser hotkeys are beeing used with other functionality (eg.: youtube uses ctrl + tab for sliding between player controls).How can I prevent this?

On certain web sites(with java applets embedded or rich content),sometimes browser hotkeys are beeing used with other functionality (eg.: youtube uses ctrl + tab for sliding between player controls).How can I prevent this ?

Thanks for posting this!
I would only mention that your definition is incomplete for this -
Contextual selector A type of Style Sheet Selector that
and that it's most often referred to now as a Descendent selector, not a contextual selector. It's basically the same as the Compound selector that you have already defined....

How i get hardware info with Java Applet

Hello Everybody.
first I am sorry for my english. This my first topic. I am a php developer and learning Java. I am developing a Java Applet.
Can i get client hardware info with Java Applet
Ýf i can How i do get hardware info with Java Applet.
I need sample code or documentation.
Thanx.

TrojanMyth wrote:
Hello;
Can i get hardware info with Java ?? Have not a know people ?Applets are restricted, unless, as already noted, they are signed and accepted by the user. See
http://java.sun.com/docs/books/tutorial/deployment/applet/security.html
http://java.sun.com/docs/books/tutorial/deployment/applet/properties.html
In general, since Java is designed to run on multiple operating systems and machine architectures it does not provide much access to the underlying hardware. As mentioned, you can access the os via methods in the java.lang.ProcessBuilder and Runtime classes.

Taking screenshot with java applet using java robot class not working

Hi Everyone,
I am using the java applet to take screenshot of the web browser using the java's robot class.
Robot objRobot = new Robot ();
BufferedImage objBufferedImage = objRobot.createScreenCapture(objRectArea);
The thing work good in windows system taking screenshot but in case of mac osx i get the blank image.When i check the event viewer in mac osx i get the following error.
invalid context
invalid pixel format
CoreAnimation: rendering error 506
The problem is coming for all the browser safari,firefox and chrome.My applet is signed applet.
What might be the reason.An early reply is very valuable.
My machine configuration is as follows.
OS : MAC OSX
Version : 10.6.4
Is that a system level issue , java plugin issue?I'am confused with this error.
Thanks sagar.

870613 wrote:
invalid context
invalid pixel formatHm, seems like the Mac implementation of the Robot class is doing some bad initializations there. I can't be a 100% sure of course, but this smells like a bug to me. Are you sure you have the latest version of Java installed?

Safari for Mac, webpage with Java applet, drag and drop area not working.

At my company, we have a web page that our users access to submit media files, (QuickTime, Audio, images...), for transcoding for delivery. The web page consists of a java applet, with an area that our users drag and drop media file into.
After updating to Safari 5.1.2, the applet will not work anymore. Instead, the browser will "open" the quicktime and play it, instead of allowing the Java Applet to do it's job.
CAN I TURN THIS FUNCTIONALITY OFF??
I read that Safari 5.1.2, (when it was initially released), broke something with the THEN current version of Java, and everyone was awaiting the latest update (build 1.6.0_29) to fix it. Unfortunately, this update did not fix my issue with the functionality of dragging and dropping media files into the web page.
It seems to me, as if, there is an over-arching functionality setting (or something) that needs to be either turned off, or in some other way DE-prioritized.
Anyone have any ideas?
Safari 5.1.2
MacOS 10.6.8
MacBook Pro

Thanks for quick reply and help. I am able to drag multiple files but this is giving problem in case of filename with spaces like "abc def.png". Can you please put some thoughts on this.
DataFlavor uriListFlavor = new DataFlavor("text/uri-list;class=java.lang.String");
               Reader in = (Reader)t.getTransferData(DataFlavor.plainTextFlavor);
               BufferedReader br = new BufferedReader(in);
               String uriStr;
               while ((uriStr = br.readLine()) != null)
                   URL url = new URL(uriStr);
                   String category = GalleryUtils.contentsPanel.getCurrentCategoryPath();
                   GalleryUtils.generateILPFromFile(new File(url.getFile()), category);
               }Thanks
Kanni

Issue with Java applet

I am having issues with an "inactive plug-in" message in Safari when I want to do something using a Java plug-in. I searched the communities and sure enough, when I opened Java preferences the box next to "enable applet plug-in and Web Start applications" the box was unchecked so I checked it. Unfortunately, when I go back into preferences, the box is once again unchecked. I did find out that I had a Trojan in the user.jar file associated with java but despite taking care of that issue (which for all I know is not related), this issue persists. All of my software is up to date and from what I gather uninstalling and reinstalling Java is not an option and should not need to be fone. I'd very much appreciate any input!

Repairing the permissions of a home folder in Lion is a complicated procedure. I don’t know of a simpler one that always works.
Back up all data now. Before proceeding, you must be sure you can restore your system to its present state
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
chmod -R -N ~
The command will take a noticeable amount of time to run. When a new line ending in a dollar sign ($) appears below what you entered, it’s done. You may see a few error messages about an “invalid argument” while the command is running. You can ignore those. If you get an error message with the words “Permission denied,” enter this:
sudo !!
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up.
Next, boot from your recovery partition by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
When the recovery desktop appears, select Utilities ▹ Terminal from the menu bar.
In the Terminal window, enter “resetpassword” (without the quotes) and press return. A Reset Password window opens. You’re not going to reset the password.
Select your boot volume if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select  ▹ Restart from the menu bar.

Using Labview with Java Applets

I want to use LabView instruments in my Java Applets. Is it possible to call virtual instruments from applets?

Gaurav,
Yes, it is possible, but it might be easier if you use Remote Panel (LabVIEW 6.1) or an ActiveX component (Application Builder). To have Java and LabVIEW communicate with your applet, I can only suggest using the Application Builder to build your VIs into a DLL and then use the JNI to talk to this DLL. This may work fine outside of a browser, but I don't know if it will work inside a browser or not because each user will need the DLL. The best way to do it would be to have the Applet redirect the user to a Remote Panel web page where they can control the VI from there.
For more information on Java and NI Products, see the link.
Randy Hoskin
Applica
tions Engineer
National Instruments
http://www.ni.com/ask

Changes in security from 7 update 45 to 7 update 51 and problems with Java applet

Hello,
After the update (from 7 update 45) to version 7 update 51 we've gotten some problems with a Java Applet as it won't run.
When changing security settings to "medium" it works, but it would not run under the default "high" setting. This lead me to update the manifest file as follows:
Manifest-Version: 1.0
Trusted-Only: true
Application-Name: MyApplet
Permissions: all-permissions
Caller-Allowable-Codebase: www.MySite.com
In addition to this, I added the <param> tag in the HTML page.
<applet name="MyApplet" code="MyApplet" archive="MyApplet.jar">
<param name="permissions" value="all-permissions" />
</applet>
The applet is digitally signed with a certificated issued by Verisign.
It now runs on my system. But I noticed that it also runs if I switch the security setting back to "high", which doesn't make any sense to me.
I've tried another computer and to the same thing there. Would not run. I switched to "medium" and and the applet worked. Switched back to "high" and it still works.
I've tried this in both Google Chorme and Internet Explorer 11.
On a third computer it won't run at all, getting a different error message than on the other two, but still related to permissions/security.
The console log message is:
"liveconnect: Security Exception: JavaScript from http://MySite.comn/MyPage.html attempted to access a resource it has no rights to."
Any ideas what I'm missing or what I need to change to get this beast to run everywhere.

I tried changing the Caller-Allowable-Codebase to not include "www." and it started giving the the same error message as for the third machine in the test.
So, I changed Caller-Allowable-Codebase to "*" which made it work on all machines.
I don't quite understand why it acts differently on different machines, if it's ok with www.MySite.com on one of the the machines, it should be OK on all no?
I don't see a problem with letting it be "*" but it would be nice to understand what's going on.

Help with java applets

Ok i know i haven't read the applet tutorial or had much experience with applets but just hear me out and see if you can help me.
BACKGROUND
Ok...so i have previously viewed an applet on windows viewing an html file on my computer. I am trying to view just the most simple applet (helloworld) on linux. I'm using Ubuntu linux, the latest version as of February 23, 2006.I created an applet file and an html file in the same directory with the html file having an <applet> tag in it linking to the HelloWorldApp. I have tried viewing the html file and the java applet won't load. Everything other than the applet worked and I'm just stuck.
So my plea is would somebody please just paste the bare minimum html file and applet file that you can see an applet with? I want to learn about applets and will do the tutorial but I would really like to just see one.
Please help,
A frustrated applet noob
p.s.
According to java.com I have installed JRE 5.0 and i have compiled a java application so I'm pretty sure I have successfully installed JDK 5.0.

Bob, what web browser are you using?
Make sure that the browser supports Java applets.
If you want just to debug your applet try appletviewer utility
from JDK first.

Problems with java applets freezing.

Okay, this is an extemely rare java problem (from what I know), and I have worked for months to fix it and nothing has worked so far.
This is my problem: Whenever I use java applets, the screen freezes (still able to move mouse around) for about 10-20 seconds about twice a minute to once in ten minutes. This can make me very angry if I am in the middle of a game. I am POSITIVE it isn't my internet, I have Cable internet, one of the fastest. And after it is done freezing the applet runs perfectly, until it freezes again.
PLEASE HELP ME! Thanks in advance, Zach.

I decided to take a look, but the Bridge program requires a signup. Not interested, but the free Poppit game plays fine as a guest on my machine on both Safari 3.1 and FireFox 3.0b4.
With FireFox I'm running AdBlock Plus, which can create problems with some sites, but the games loaded and played.
Based on this, I'd check the time of day you are trying to use their site and see if there are more problems with certain times.

Need help with Java applet, might need NetBeans URL

I posted the below question. It was never answered, only I was told to post to the NetBeans help forum. Yet I don't see any such forum on this site. Can someone tell me where the NetBeans help forum is located (URL).
Here is my original question:
I have some Java source code from a book that I want to compile. The name of the file is HashTest.java. In order to compile and run this Java program I created a project in the NetBeans IDE named javaapplication16, and I created a class named HashTest. Once the project was created, I cut and pasted the below source code into my java file that was default created for HashTest.java.
Now I can compile and build the project with no errors, but when I try and run it, I get a dialog box that says the following below (Ignore the [...])
[..................Dialog Box......................................]
Hash Test class wasn't found in JavaApplication16 project
Select the main class:
<No main classes found>
[..................Dialog Box......................................]
Does anyone know what the problem is here? Why won't the project run?
// Here is the source code: *****************************************************************************************************
import java.applet.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.*;
public class HashTest extends Applet implements ItemListener
// public static void main(String[] args) {
// Hashtable to add tile images
private Hashtable imageTable;
// a Choice of the various tile images
private Choice selections;
// assume tiles will have the same width and height; this represents
// both a tile's width and height
private int imageSize;
// filename description of our images
private final String[] filenames = { "cement.gif", "dirt.gif", "grass.gif",
"pebbles.gif", "stone.gif", "water.gif" };
// initializes the Applet
public void init()
int n = filenames.length;
// create a new Hashtable with n members
imageTable = new Hashtable(n);
// create the Choice
selections = new Choice();
// create a Panel to add our choice at the bottom of the window
Panel p = new Panel();
p.add(selections, BorderLayout.SOUTH);
p.setBackground(Color.RED);
// add the Choice to the applet and register the ItemListener
setLayout(new BorderLayout());
add(p, BorderLayout.SOUTH);
selections.addItemListener(this);
// allocate memory for the images and load 'em in
for(int i = 0; i < n; i++)
Image img = getImage(getCodeBase(), filenames);
while(img.getWidth(this) < 0);
// add the image to the Hashtable and the Choice
imageTable.put(filenames[i], img);
selections.add(filenames[i]);
// set the imageSize field
if(i == 0)
imageSize = img.getWidth(this);
} // init
// tiles the currently selected tile image within the Applet
public void paint(Graphics g)
// cast the sent Graphics context to get a usable Graphics2D object
Graphics2D g2d = (Graphics2D)g;
// save the Applet's width and height
int width = getSize().width;
int height = getSize().height;
// create an AffineTransform to place tile images
AffineTransform at = new AffineTransform();
// get the currently selected tile image
Image currImage = (Image)imageTable.get(selections.getSelectedItem());
// tile the image throughout the Applet
int y = 0;
while(y < height)
int x = 0;
while(x < width)
at.setToTranslation(x, y);
// draw the image
g2d.drawImage(currImage, at, this);
x += imageSize;
y += imageSize;
} // paint
// called when the tile image Choice is changed
public void itemStateChanged(ItemEvent e)
// our drop box has changed-- redraw the scene
repaint();
} // HashTest

BigDaddyLoveHandles wrote:
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
That wasn't attention-grabbing enough apparantly. Let's try it again.
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}

JFrames withous status bar with "Java Applet Window" ?

Hello.
I call a JFrame from JApplet. All my JFrames with a status bar where string "Java Applet Window" is showing. How can I creat JFrames without that status bar?
Thank you in advance.

This shows as a security measure because your applet isn't "signed". Your applet must be signed in order for this to not show.
Refer to the following for a how-to:
http://java.sun.com/developer/qow/archive/167/index.jsp

Adjusting work environment with oracle developer 6.0 running on SCO-UNIX

i've been working on UNIX-WARE 7.1 OS. and i've got some difficulties to adjust work environment, especially with developer. Sometimes, it is crashed during compile, is there anyone having idea to solve my problem. thanks.

I am having the same exact problems, except I'm attempting to put the two on windows 98. I'm a student at California State Univeristy of Sacramento, and this problem does not seem to be rare. If anyone, such as a Oracle employee scanning over this discussion, could explain how to install this combination, and remove it, please help!!!
The teacher suggested installing developer in one home, and oracle in another home. I have yet to try this since I am having problems deleting Oracle off of my computer.
Please help
[email protected]

Maverick don't work properly with java app

I've upgraded from lion to maverick today and had to install java again. Now one of my java apps starts just like it were before, but can't see any files throught "browse" button. It shows some folders and devices without icons (just title), and don't show other files at all (no icons, no titles). Since this app is critical for my business, I'll sell macbook if I won't fix it. How can I solve it? Can I downgrade to lion?

rusmanson wrote:
Yes, it's enabled. Java applet starts, and works, but file browsing through it is not working, though it works in Firefox.
Found this on another post. Hopefully it might help:
To all Java users: remember that when you access a Java site, you are warned that some applets might be insecure. If you allow them to run, Safari might eventually block them anyway, because the applets are not signed or are known to have caused trouble. If you still wish to run them, do this:
1. Go to the Safari menu and select Preferences.
2. Click on the Security icon.
3. Make sure that the "Enable Java Script" and "Allow Java" options are checked.
4. Click on the "Manage Website Settings" button.
5. Make sure to choose "Allow Always" from the dropdown menu in the window that appears near the name of the site where the applets reside. If you only choose "Allow", some applets will not run.
Again, remember that using Java these days may pose a security threat. Whenever that happens, Apple will update the OS and disable Java.

Collaborative work environment with JAVA Applet

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