AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  network is hindering my applet Goto page 1, 2  Next          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Redbeard Guest Posted: Sat Oct 29, 2005 2:29 am    Post subject: network is hindering my applet I teach high school math. Over the last few years I have written some applets that I use in my job. Three of those use data from files that reside on the server with the applets. Two load data from text files, while the third loads a picture. The applets have worked for years. But over the summer, my IT department did something to our servers and they no longer work. For some reason, the applets no longer load the necessary files. On a school budget, our IT dept. is severely limited. They are strictly Microsoft. Nobody really knows anything about Java, so none have any idea what they might have done which would lead to this? I know that I'm grasping at straws, but does anyone have any ideas? Back to top Chris Smith Guest Posted: Sat Oct 29, 2005 3:53 am    Post subject: Re: network is hindering my applet Redbeard <tom.cowdery (AT) bigfoot (DOT) com> wrote: Quote: The applets have worked for years. But over the summer, my IT department did something to our servers and they no longer work. For some reason, the applets no longer load the necessary files. On a school budget, our IT dept. is severely limited. They are strictly Microsoft. Nobody really knows anything about Java, so none have any idea what they might have done which would lead to this? I know that I'm grasping at straws, but does anyone have any ideas? Nope, no ideas. If you tell us what you mean by "no longer work", it might be helpful. Any error messages from the Java console would be great. -- www.designacourse.com The Easiest Way To Train Anyone... Anywhere. Chris Smith - Lead Software Developer/Technical Trainer MindIQ Corporation Back to top Hal Rosser Guest Posted: Sat Oct 29, 2005 5:54 am    Post subject: Re: network is hindering my applet "Redbeard" <tom.cowdery (AT) bigfoot (DOT) com> wrote Quote: I teach high school math. Over the last few years I have written some applets that I use in my job. Three of those use data from files that reside on the server with the applets. Two load data from text files, while the third loads a picture. The applets have worked for years. But over the summer, my IT department did something to our servers and they no longer work. For some reason, the applets no longer load the necessary files. On a school budget, our IT dept. is severely limited. They are strictly Microsoft. Nobody really knows anything about Java, so none have any idea what they might have done which would lead to this? I know that I'm grasping at straws, but does anyone have any ideas? Sounds like a permissions issue on the files being *not* accessed. Back to top Redbeard Guest Posted: Sat Oct 29, 2005 9:33 pm    Post subject: Re: network is hindering my applet Quote: Nope, no ideas. If you tell us what you mean by "no longer work", it might be helpful. Any error messages from the Java console would be great. They don't load the files. I get a FileNotFoundException like the one shown below. IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm In this case, basic.dsm is a text file that contains data used by the applet. In the example shown, the file is in the same folder as the applet. One of the other applets (which I wrote later) stores the datafiles in a subdirectory. But all of the data files are exactly where they were last school year when the applets were working. In fact, I demonstrated the applets to some colleagues from other schools over the summer, and they were working fine. But over the summer break our IT dept. brought in a hired gun from MS to help upgrade our network. He's gone, and nobody is sure what he might have changed that would have caused my applets to stop finding their data files. Back to top andreas kinell Guest Posted: Sat Oct 29, 2005 11:43 pm    Post subject: Re: network is hindering my applet "Redbeard" <tom.cowdery (AT) bigfoot (DOT) com> wrote: news:1130621597.875424.276860 (AT) g14g2000cwa (DOT) googlegroups.com... Quote: Nope, no ideas. If you tell us what you mean by "no longer work", it might be helpful. Any error messages from the Java console would be great. They don't load the files. I get a FileNotFoundException like the one shown below. IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm In this case, basic.dsm is a text file that contains data used by the applet. In the example shown, the file is in the same folder as the applet. One of the other applets (which I wrote later) stores the datafiles in a subdirectory. But all of the data files are exactly where they were last school year when the applets were working. In fact, I demonstrated the applets to some colleagues from other schools over the summer, and they were working fine. But over the summer break our IT dept. brought in a hired gun from MS to help upgrade our network. He's gone, and nobody is sure what he might have changed that would have caused my applets to stop finding their data files. Well, when I click on your link I get an error "page not found". Maybe the directory just changed? In your case, the basic.dsm is in the same directory as the applet, so why don't you refer to the file relatively? "./basic.dsm" the other applets use: "<subdirectory_name>/<filename>" to access the file. Don't specify the whole path just for the reason that it will be broken easily when changing the directory structure. andreas Back to top Roedy Green Guest Posted: Sun Oct 30, 2005 4:54 am    Post subject: Re: network is hindering my applet On 28 Oct 2005 19:29:39 -0700, "Redbeard" <tom.cowdery (AT) bigfoot (DOT) com> wrote, quoted or indirectly quoted someone who said : Quote: On a school budget, our IT dept. is severely limited. They are strictly Microsoft. Nobody really knows anything about Java, so none have any idea what they might have done which would lead to this? Look at the console stack traces for hints. I suspect you are getting in trouble with some sort of security violation. You must put the datafiles "downstream" of the webpages that have applets in them that read them. In other words in the same directory or in a child or grandchild directory of that directory. Otherwise you must sign the applet. In many cases the easy way out of this is to bundle the datafiles as resources in the jar and get at them with getResourceAsStream. See http://mindprod.com/jgloss/applet.html http://mindprod.com/jgloss/signedapplets.html http://mindprod.com/jgloss/console.html http://mindprod.com/jgloss/resource.html -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Roedy Green Guest Posted: Sun Oct 30, 2005 4:55 am    Post subject: Re: network is hindering my applet On Sat, 29 Oct 2005 01:54:10 -0400, "Hal Rosser" <hmrosser (AT) bellsouth (DOT) net> wrote, quoted or indirectly quoted someone who said : Quote: Sounds like a permissions issue on the files being *not* accessed. try downloading the file with the browser. Case sensitive. -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Redbeard Guest Posted: Sun Oct 30, 2005 11:11 pm    Post subject: Re: network is hindering my applet andreas kinell wrote: Quote: "Redbeard" <tom.cowdery (AT) bigfoot (DOT) com> wrote: news:1130621597.875424.276860 (AT) g14g2000cwa (DOT) googlegroups.com... Nope, no ideas. If you tell us what you mean by "no longer work", it might be helpful. Any error messages from the Java console would be great. They don't load the files. I get a FileNotFoundException like the one shown below. IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm In this case, basic.dsm is a text file that contains data used by the applet. In the example shown, the file is in the same folder as the applet. One of the other applets (which I wrote later) stores the datafiles in a subdirectory. But all of the data files are exactly where they were last school year when the applets were working. In fact, I demonstrated the applets to some colleagues from other schools over the summer, and they were working fine. But over the summer break our IT dept. brought in a hired gun from MS to help upgrade our network. He's gone, and nobody is sure what he might have changed that would have caused my applets to stop finding their data files. Well, when I click on your link I get an error "page not found". Maybe the directory just changed? I hadn't tried that myself. I got a message "The request is not supported". When I tried to list the directory, I got the message "This Virtual Directory does not allow contents to be listed." I'm absolutely certain the files are there, as I have opened up the website in Frontpage and checked the contents. Any idea what a "virtual directory" is, or if it could be the root of my problem? Quote: In your case, the basic.dsm is in the same directory as the applet, so why don't you refer to the file relatively? "./basic.dsm" That is how I access the files. Quote: the other applets use: "<subdirectory_name>/<filename>" ditto. This is how it is done. Quote: to access the file. Don't specify the whole path just for the reason that it will be broken easily when changing the directory structure. I don't use absolute URL's. That is why I'm so puzzled by this problem. Over the years, they have switched servers before for various reasons (reorganization, overcrowding, one crashed and burned, etc.) and my applets have continued to work just fine. But whatever they did this time is making impossible for the applet to find the files even though I'm certain that they are there. Back to top Redbeard Guest Posted: Sun Oct 30, 2005 11:20 pm    Post subject: Re: network is hindering my applet Here is the whole stack. I don't see anything in there security related - do you? IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm Exception in thread "AWT-EventQueue-3" java.lang.NullPointerException at PracticeProblems.getRandomProblem(PracticeProblems.java:62) at FactorProblems.selectProblem(FactorProblems.java:138) at FactorProblems.getSimplifiedPolynomial(FactorProblems.java:122) at FactorProblems.nextProblemButtonPushed(FactorProblems.java:260) at FactorProblems.start(FactorProblems.java:115) at Factor$StartButtonActions.actionPerformed(Factor.java:209) at java.awt.Button.processActionEvent(Unknown Source) at java.awt.Button.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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) Quote: You must put the datafiles "downstream" of the webpages that have applets in them that read them. In other words in the same directory or in a child or grandchild directory of that directory. That is where they are. This one has the files right in the directory with the applet. One of the others stores them in a child folder. Again, these applets worked fine for years and I haven't changed anything. I just found out a few days ago that they aren't loading those text files any more. The last time I'd used them, they were working. Quote: try downloading the file with the browser. Case sensitive. As mentioned in my other reply, I get a message that says "The request is not supported" Quote: In many cases the easy way out of this is to bundle the datafiles as resources in the jar and get at them with getResourceAsStream. Thanks for the suggestion. If nothing else works, I'll have to consider that. Back to top Andrew Thompson Guest Posted: Mon Oct 31, 2005 4:19 am    Post subject: Re: network is hindering my applet Redbeard wrote: Quote: Here is the whole stack. I don't see anything in there security related - do you? IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm This is completely unastounding. As other posters have noted THAT FILE IS MISSING. It produces a '404' - not found. Try the directory itself and you get a 403 - Forbidden. Back to top Roedy Green Guest Posted: Mon Oct 31, 2005 4:35 am    Post subject: Re: network is hindering my applet On 30 Oct 2005 15:20:35 -0800, "Redbeard" <tom.cowdery (AT) bigfoot (DOT) com> wrote, quoted or indirectly quoted someone who said : Quote: http://www.district87.org/bhs/math/practice/Factor/basic.dsm When I put this into my browser I got: "The request is not supported." So it sounds as if your server is refusing to serve "dsm" files. Ask your administrator to add support for them, telling him the MIME to use. See http://mindprod.com/jgloss/mime.html http://mindprod.com/jgloss/htaccess.html If he says "no", ask what extensions does he recommend for a raw byte stream. e.g. .dat. then change the filenames in your code and on the server. If he stares at you blankly, revert to plan B. Put the files as resources in the jar. -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Redbeard Guest Posted: Mon Oct 31, 2005 1:37 pm    Post subject: Re: network is hindering my applet Andrew Thompson wrote: Quote: Redbeard wrote: Here is the whole stack. I don't see anything in there security related - do you? IOException: java.io.FileNotFoundException: http://www.district87.org/bhs/math/practice/Factor/basic.dsm This is completely unastounding. As other posters have noted THAT FILE IS MISSING. It produces a '404' - not found. But it is NOT missing - that is what puzzles me. I can open up the website in Frontpage and see it there. However, I find it interesting that you are getting a '404' error. I don't. I get "The request is not supported.". Back to top Redbeard Guest Posted: Mon Oct 31, 2005 1:41 pm    Post subject: Re: network is hindering my applet Thanks for the suggestion. The .dsm extention is essentially meaningless - they are my wife's initials from her maiden name. I used them just for the heck of it. So it I have to change them back to .txt, it is no big deal. Back to top Chris Smith Guest Posted: Mon Oct 31, 2005 3:06 pm    Post subject: Re: network is hindering my applet Redbeard <tom.cowdery (AT) bigfoot (DOT) com> wrote: Quote: I hadn't tried that myself. I got a message "The request is not supported". That's the 404 error message that someone configured for that web site. The problem is that basic.dsm doesn't exist. Quote: When I tried to list the directory, I got the message "This Virtual Directory does not allow contents to be listed." This is fairly normal. The obscurity camp of security concerns doesn't like enabling directory listings on web sites. Chances are that this has either been this way for a long time, or the Microsoft guy changed it as an "obvious" security fix. Quote: I'm absolutely certain the files are there, as I have opened up the website in Frontpage and checked the contents. Maybe you should back up, then, and check your assumptions. Perhaps the files are there in your local copy of the site via FrontPage, but are not being uploaded to the server for some reason. -- www.designacourse.com The Easiest Way To Train Anyone... Anywhere. Chris Smith - Lead Software Developer/Technical Trainer MindIQ Corporation Back to top Redbeard Guest Posted: Mon Oct 31, 2005 8:03 pm    Post subject: Re: network is hindering my applet I appreciate your help. I had considered that possibility, but the desktop machine that I am assigned was was wiped clean over the summer while they upgraded every machine in the school to WinXP from Win2K. I doubt that it is even the same CPU that I had last fall. So there is no way that a local copy is on this machine. I do have a backup on my USB thumb drive, but I don't have it connected. So I can't see any way that what I am looking at is anything BUT the copy on the server. And the file in question is there - plain as day. 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