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Java Forum / First Aid / October 2004Applet No Longer Working
I have an applet that was written a couple of years ago that works under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. Where should I start looking for the problem? Is it more likely the java code, a bug in the virtual machine, the html, or something else? We're running cold fusion, but the applet is being called via the <applet> tag. All that comes up on the newer machines is the dreaded red X. Thanks in advance, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. > I have an applet that was written a couple of years ago that works > under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. Maybe it's just gotten lazy, ehhh? Try flogging it. <http://www.physci.org/codes/javafaq.jsp#exact> > Where should I start looking for the problem? a) The Java console of the browser when pointing at the URL you did not supply. Where is it? b) The code you (also) did not supply. <http://www.physci.org/codes/sscce.jsp>  SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane > > I have an applet that was written a couple of years ago that works > > under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. > > Maybe it's just gotten lazy, ehhh? Try flogging it. OK, the problem doesn't appear to be my specific applet. My newer machines don't seem to be recognizing the jvm. I just went out to Sun's site and tried to run their sample applets and got the same results. I tried reinstalling the jre, but it still isn't working. I'm sure it is just a setting or something, but I can't seem to find it. :( Any thoughts? Thanks in advance, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. >>> I have an applet that was written a couple of years ago that works >>> under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. [quoted text clipped - 5 lines] > Sun's site and tried to run their sample applets and got the same > results. It's time to bail you up with 'which browser'? >...I tried reinstalling the jre, but it still isn't working. > I'm sure it is just a setting or something, What is your OS component* configured to use? <http://www.physci.org/pc/property.jsp?prop=java.version+java.vendor> * WAG >..but I can't seem to find > it. :( Any thoughts? More info. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane > >>> I have an applet that was written a couple of years ago that works > >>> under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. [quoted text clipped - 15 lines] > > * WAG I'm using Internet Explorer, v6. Since I'm not seeing *any* applets, the applet on the web page you referenced above doesn't tell me anything. :( However, entering "java -version" on the command line gives me java version "1.4.2_06" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03) Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode) (as it should since that's the version I installed on this machine last night). Thanks again, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. >>>>> I have an applet that was written a couple of years ago that works >>>>> under ie 5 with jvm 1.4.2, but not under ie 6 with jvm 1.4.2_03. [quoted text clipped - 7 lines] >> >> It's time to bail you up with 'which browser'? > I'm using Internet Explorer, v6... OK, I have some experience with IE. It is worthwhile finding out if the problem is IE specific. Install Firefox and configure/check it's Java. >>>...I tried reinstalling the jre, but it still isn't working. >>> I'm sure it is just a setting or something, [quoted text clipped - 3 lines] >> >> * WAG That WAG was IE, it is the single most common source of 'problem with applet' type questions. Mentioned in the FAQ <http://www.physci.org/codes/javafaq.jsp#appletie> > ... Since I'm not seeing *any* applets, > the applet on the web page you referenced above doesn't tell me > anything. :( OK, time to delve further into IE. <http://www.physci.org/jvmclean.jsp?pt=deselect> This page is not relevant to your problem, but the image is. Bring up the tools/configuration screen displayed on that page, and report back what you find. What Java's (if any) are listed? Are they selected? > However, entering "java -version" on the command line gives me > > java version "1.4.2_06" Thanks. You can also answer basic questions about you local environment with the JTest application (linked from the top of the page with 'PC properties' applet). It is the applcation version of the properties applet. Of course, we need to concentrate on your browser environment for the moment. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane >It is worthwhile finding out if the problem is IE specific. > >Install Firefox and configure/check it's Java. OK, I installed Firefox, and the applet runs perfectly on the same machine. >That WAG was IE, it is the single most common source of 'problem >with applet' type questions. Mentioned in the FAQ ><http://www.physci.org/codes/javafaq.jsp#appletie> I made sure the java plug-in was installed before I posted, and if I had an error message to go from (e.g. class not found), then I could probably diagnose the problem myself. I realize that most people that ask "why won't my applet run?" are complete newbies, but I'm not. ;) > What Java's (if any) are listed? Are they selected? The ie and Firefox options screens both tell me that I'm using Sun's jvm 1.4.2_06. Again, that is after the reinstall. It previously read 1.4.2_03. And yes, it's selected. >>However, entering "java -version" on the command line gives me >> [quoted text clipped - 6 lines] >Of course, we need to concentrate on your browser >environment for the moment. OK, I downloaded the jtest application so if we need any of that, I can get it pretty easily. Thanks again, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. >> What Java's (if any) are listed? Are they selected? > > The ie and Firefox options screens both tell me that I'm using Sun's > jvm 1.4.2_06. Again, that is after the reinstall. It previously read > 1.4.2_03. And yes, it's selected. I missed something in your first post that might be important. Can you run applets that use <object>/<embed> elements? (Use the HTMLConverter if you need to, I suppose only the <object> element is needed) If you can run applets that way, it might be that somebody has run the (supposedly withdrawn) unmsjvm.exe on the affected PC's. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane > Can you run applets that use <object>/<embed> elements? > (Use the HTMLConverter if you need to, I suppose only the > <object> element is needed) > > If you can run applets that way, it might be that somebody has > run the (supposedly withdrawn) unmsjvm.exe on the affected PC's. Cold Fusion didn't like the format of the converted tag, but when I took out the cf code and made a plain html file with object/embed tags it worked. I then tried making a plain html file with the applet tag, and it didn't work. That rules out Cold Fusion as the culprit. Unless our tech group has put unmsjvm.exe into an automated script that runs upon bootup or upon attaching to the network, I don't think anybody would have done that. The two machines that I'm currently trying to fix (there are others with this issue), are reserved for my personal use. Thanks, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. >> Can you run applets that use <object>/<embed> elements? >> (Use the HTMLConverter if you need to, I suppose only the [quoted text clipped - 13 lines] > trying to fix (there are others with this issue), are reserved for my > personal use. The symptoms of this problem all point to 'unmsvm.exe' being run.. - cannot run <applets> - can run <object>/<embed> - Win/IE combo. I can think of no other problem that would produce those results. The 'fix' is simple, find, download and install the 3805, 3809 and 3810 builds of the MSVM - that should fix IE's ability to use the <applet> element. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane > The 'fix' is simple, find, download and install the 3805, 3809 and > 3810 builds of the MSVM - that should fix IE's ability to use the > <applet> element. This seems to have done the trick. For anyone else with the same problem, I downloaded the three builds from http://www.virtualmachine.tk/. During my research in finding the msjvm builds, I found a reference to a microsoft security patch that reportedly needs to be installed as well. Further research indicated that build 3810 *is* the security patch. Someone please correct me if I'm wrong here. *sigh* This is why I'm a software guy and not a hardware guy. Thanks Andrew, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. > ...Further research indicated that build 3810 *is* the security > patch. Probably, yes. The 3810 was the safest and last of the MSVM builds, though there are still some security aspects about it that I consider to be questionable. >..Someone please correct me if I'm wrong here. I have a better alternative to either leaving the MSVM installed, *or* using the unmsvm.exe. It was during my investigations of the problems caused by 'unmsvm.exe' that I developed a better alternative to render IE safe of the MSVM. It is called JVMClean, and it removes the MSVM from under IE. <http://www.physci.org/jvmclean.jsp> > *sigh* This is why I'm a software guy and not a hardware guy. Could you hunt down whoever it was that installed/ran the unmsvm.exe and notify them of the better alternative? I am concerned about the other PC's this person has access to. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane Oh, I forgot to mention. The machines with the problems are all running Windows XP. Thanks, Larry Davis Senior Programmer/Analyst Cooper Crouse-Hinds, LLC Note: The email address on the message is a spam catcher. To reply directly to me, send your message to Larry dot Davis at crouse dash hinds dot com where the words dot, at, and dash represent the characters ".", "@", and "-" respectively. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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