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Java Forum / General / April 2008<OBJECT> tag and applet caching
I'm sure this has been answered before, but I cannot find where. I've recently switched from using <APPLET> to <OBJECT> for embedding my java applets. During development, I would like to be able to disable caching of my applets. It's not convenient to develop the applet as a java application. I'm developing in Eclipse and serving the applet via JSP. I need it to reload every time. Here's what I have so far. The applet is communicating with the servlet via ObjectInput/OutputStream and they share a jar which defines data objects. The jars are available to the browser from the / applets path. The below WORKS, but my applet is still cached. Using IE7. Thanks for your input. <object classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" codebase = "http://java.sun.com/update/1.5.0/jinstall-1_5-windows- i586.cab#Version=5,0,0,5" WIDTH = "200" HEIGHT = "200" > <PARAM NAME = CODE VALUE = "path.to.my.applet.class" > <PARAM NAME = CODEBASE VALUE = "/applets" > <param name = "type" value = "application/x-java- applet;version=1.5"> <param name = "scriptable" value = "false"> <PARAM NAME = "cache_option" VALUE="No" > <PARAM NAME = "cache_archive" VALUE = "applet.jar,dataobj.jar"> </object> > I'm sure this has been answered before, but I cannot find where. I've > recently switched from using <APPLET> to <OBJECT> for embedding my [quoted text clipped - 21 lines] > <PARAM NAME = "cache_archive" VALUE = "applet.jar,dataobj.jar"> > </object> I don't know of any mainstream browser that doesn't cache applets. There's nothing you can do about it. I suggest you avoid object tags and go back to applet tags. The object tags don't work correctly from a MS IIS server (the web page will fail to load with nested object tags). Applet tags are supported on all servers I know of. For development, use "appletviewer" to test your applets. It has a menu for reload/restart the applet. -Wayne > I suggest you avoid object tags and go back to applet tags. The > object tags don't work correctly from a MS IIS server (the web page > will fail to load with nested object tags). Applet tags are supported > on all servers I know of. Could you explain how object/applet tags depends on HTTP server ? Both HTML and JAR files are just some bytes seen from the web server perspective only client side knows what those bytes are. Or at least that is how I understand it. Arne >> I suggest you avoid object tags and go back to applet tags. The >> object tags don't work correctly from a MS IIS server (the web page [quoted text clipped - 9 lines] > > Arne Yeah, that's what I thought. Apparently this is a bug in IIS that Microsoft knows about for years now, but refuses to fix. What happens is you get an ASP error: Active Server Pages error 'ASP 0139' Nested Object even if your file extension is .htm or .html. IIS scans pages and refuses to serve a page with (perfectly legal) nested object tags! Even though it was MS that pushed the w3c to use object and not applet tags. I guess this is part of the MS business model to break Java. My school uses IIS, they won't switch to Apache for some reason. I've tried! But that's how I found all this out. The work-around is to use IE conditional comments to hide the nested tags. But since applet tags work perfectly well, even if not approved by w3c, I suggest using it. Maybe HTML 5 will add back the applet tag, I believe they are adding the embedded tag officially. -Wayne >The work-around is to use IE conditional comments to hide >the nested tags. But since applet tags work perfectly well, >even if not approved by w3c, I suggest using it. Since Object tags are warfare to destroy Java, and since <applet tags work fine, and since Object tags are impossible to maintain or proofread, I suggest ignoring them. They have only one virtue. See http://mindprod.com/jgloss/applet.html  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I don't know of any mainstream browser that doesn't cache applets. >There's nothing you can do about it. Browsers load the Applet class. Getting rid of it is the same as the problem as getting rid of a class you have loaded. All you really can do is start up a class loader to load the new version of it and wait for the old one to die of lack of references. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >> I'm sure this has been answered before, but I cannot find where. I've >> recently switched from using <APPLET> to <OBJECT> for embedding my >> java applets. During development, I would like to be able to disable >> caching of my applets. It's not convenient to develop the applet as a >> java application. I'm developing in Eclipse and serving the applet via >> JSP. I need it to reload every time. > For development, use "appletviewer" to test your applets. It has a menu > for reload/restart the applet. > > -Wayne I should add that if you must use W3C complient HTML, you should still develop using the applet tag. When ready to deploy you can use the "htmlconverter" application (part of the JDK) that converts applet tags to about 20 lines of broswer/server detecting JavaScript, object, applet, and embed tags, and will work for any browser. -Wayne Thanks for the discussion on this. Unfortunately, my implementation depends on the JSP and I'm making use of Liveconnect, so I can't use the applet viewer and test normally. Having said that, my solution is to x-c in the Java console to clear this cache. This works without unloading the JVM and while the applet is running. It looks like the browser isn't caching any applets. At least my browser cache doesn't contain any, although I do regularly use half a dozen, so it must be the JRE. Anyway, clearing through the console solves my problem. Also, I have tried HtmlConverter.exe. What a mess of output! Couldn't we just keep <APPLET>? Thanks again for your replies. J >will work for any browser. I suspect if you tried them on all the world's browsers <applet would be considerably more widely supported. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com I never thought you could do that with HTML. I thought it was a browser setting. http://groups.google.com/group/java-software-develoupment?hl=en tOn Tue, 1 Apr 2008 15:18:23 -0700 (PDT), Chase Preuninger <chasepreuninger@gmail.com> wrote, quoted or indirectly quoted someone who said : >I never thought you could do that with HTML. I thought it was a >browser setting. > >http://groups.google.com/group/java-software-develoupment?hl=en when you put your url like that, it looks as if you are saying there is an answer to the caller's question there. Try something like this: --(space) Chase Preuninger http://groups.google.com/group/java-software-develoupment?hl=en SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com 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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