Problem with running the java application

**nat** · June 18th, 2014, 10:01 AM

Hi,

I have a java application which uses Google Maps to analyze the traffic condition.
But sometimes it can be run and work properly, sometimes not. On some computers on which there is installed java, the program can be run, and on some, again with installed java (jre), exactly the same version, the program can not be run. For example the application first run well on my desktop computer, connected in a LAN, and then stopped working well when run. But when I use laptop which uses the WiFi and run the same computer using VMWare, if I connect to the desktop on which the program can not be run, on the laptop the same program can be run well, in the same room, but using the Wifi.

Can anybody tell me what could be the problem and how to solve it?
Thanks.

**Norm** · June 18th, 2014, 10:03 AM

Are there any error messages that can help showing what the problem is?

**nat** · June 18th, 2014, 01:22 PM

No, only the program doesn't open the window which is supposed to be a screen shot of the Google Map, but opens again the starting window for the program.

**Norm** · June 18th, 2014, 01:31 PM

It's hard to locate a problem without some error messages. Does the code have printStackTrace() calls in the catch blocks?

**nat** · June 18th, 2014, 02:57 PM

I put now, but again the same problem persists. Here is some of the code:

try {
			robot = new Robot();
 
			ImageManipulation imageManipulation = new ImageManipulation();
 
			mainWindow.setVisible(false);
 
			if(GuiMain.USE_PARAMETERS) {
				String htmlFilePath = "html" + ToolKit.fileSeparator() + "trafficPrototype.html";
				File htmlFile = new File(htmlFilePath);
 
				String[] params = {"coord=" + mapSection.getCoordString(), "view=2"};
				ToolKit.openBrowser(htmlFile.toURI(), params);
			} else {
				String htmlFilePath = "html" + ToolKit.fileSeparator() + "trafficPrototype2.html";
				File htmlFile = new File(htmlFilePath);
 
				HtmlController.writeParameterScript(mapSection.getLat(), mapSection.getLng(), 
					mapSection.getZoom(), 2, 0);//moe
				ToolKit.openBrowser(htmlFile.toURI());
			}
 
			try {
				Thread.sleep(15000);
			} catch(InterruptedException ie) {
				// ignore!
                ie.printStackTrace();
            }
 
			BufferedImage mapImageScreenshot = robot.createScreenCapture(
				new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
 
			mapImage = imageManipulation.retrieveMapImage(mapImageScreenshot);
 
			try {
				Thread.sleep(15000);
			} catch(InterruptedException ie) {
 
                ie.printStackTrace();
            }

**Norm** · June 18th, 2014, 03:08 PM

Without an error message, I can't guess what is wrong.

Can you make a small, complete program that compiles, executes and shows the problem?

**nat** · June 18th, 2014, 03:18 PM

There isn't any message appearing. But if I run it on my laptop using VMware and WiFi, i.e. to run the same program connecting on the desktop computer where it doesn't work and doesn't show an error message, it will work as it should.
How do you mean to make a small complete program tha compiles? This compiles and starts to work but when I chose the map that is supposed to open, it opens, but the window with the screen shot doesn't open, and no message appears as well.

**Norm** · June 18th, 2014, 03:40 PM

How do you mean to make a small complete program tha compiles?

And executes and shows the problem for testing.

If it requires VMware for testing that will be a problem.
What do you mean by Wifi?

**nat** · June 18th, 2014, 03:56 PM

Wi-Fi= local area wireless technology

**Norm** · June 18th, 2014, 04:03 PM

Are you saying the desktop (where it fails) is wired to the network and the laptop (where it works) is using wifi to connect to the network?

Why is VMware needed?

**nat** · June 18th, 2014, 06:40 PM

I use VMWare to connect to the desktop from my laptop. Yes, the desktop is connected in a cloud, connected on a LAN, and yes, the laptop uses the WiFi in the lab. But if I run the same program, copied on the local hard drive on the laptop it doesn't work as well if I use the internet at home. It works from home only if connected via VMware to the desktop in the lab

**Norm** · June 18th, 2014, 06:57 PM

The problem sounds like a configuration problem, not a java programming problem.

**nat** · June 18th, 2014, 07:44 PM

OK, so what do you suppose to do now? What could be wrong?
And I forgot, in some parts of the day the program works on the desktop as well, but rarely. First it happened rarely, then frequent, and lately it doesn't work at all, although nothing has been changed meanwhile.

**Norm** · June 18th, 2014, 07:56 PM

I haven't worked with any of the components involved with your problem and have no idea what could be wrong.

**nat** · June 19th, 2014, 07:50 AM

I just meant if you can mention please what do you understand by configuration problem? In that context, can you please tell me several possible?

**Norm** · June 19th, 2014, 08:01 AM

How many different variables are there to the problem? One is the java program. What are the others?
When and where does the java program work or not work? Is time of day a factor? Is load on the server a factor?

**GregBrannon** · June 19th, 2014, 12:41 PM

How are you running the program? If you're running from a command shell, you should be seeing error messages when the program stops working. Or, run the program using a debugger or profiler to see where the problems might be.

**nat** · June 19th, 2014, 03:01 PM

I just run it from IntelliJ. I tried to debug it and again, the processing of the new window, which is supposed to be a screenshot of the map, finishes, and instead of the window with the screenshot of the map, the first, loading window, appears again. And no errors appear.

**GregBrannon** · June 19th, 2014, 03:06 PM

Try running your program from the command line.

**nat** · June 19th, 2014, 05:17 PM

I also have another problem. I can't make a jar file, so how can I run the program from a command line? Can I?

**Norm** · June 19th, 2014, 05:31 PM

You don't need to put the class files in a jar file to execute them.

Open a command prompt window,
cd to the directory with the class file
enter the command: java TheClassName

If the class is in a package, you need to cd to the directory for the package name
and enter the command: java thepackage.TheClassName

**GregBrannon** · June 19th, 2014, 06:07 PM

Originally Posted by nat

I also have another problem. I can't make a jar file, so how can I run the program from a command line? Can I?

I don't mean to be rude or disrespectful, but the project you've described includes skills learned in chapters 9 and beyond of most Java books while running a Java program from the command line should be covered in chapter 2, maybe 3. You should really learn the Java basics - really learn them - before taking on advanced Java projects.

**nat** · June 21st, 2014, 02:41 PM

Thanks Greg

**nat** · June 23rd, 2014, 12:35 PM

Thank you very much Norm. I tried this, but I made some mistake I suppose, so I will continue to try this. Thanks again

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