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Java Forum / General / October 2007[applet] handle wrong jre
Hi, I have an applet written with java5. Suppose someone tries to execute it with a jre4. java console will print a system exception. But how can I handle that exception properly and show a user friendly dialog box telling that a jre update is needed ? thanks ! .. >I have an applet .. You like trouble? >..written with java5. >Suppose someone tries to execute it with a jre4. As they might. End users are mean that way. >java console will print a system exception. >But how can I handle that exception properly and show a user friendly >dialog box telling that a jre update is needed ? One (almost) solution <http://www.physci.org/codes/jre.html> A far better solution. Use JWS To launch the applet.. <http://www.physci.org/jws/#jtest> ..and for versioning.. <http://www.physci.org/jws/version.html> >thanks ! No worries.  SignatureAndrew Thompson http://www.athompson.info/andrew/ >One (almost) solution ><http://www.physci.org/codes/jre.html> 1. could you add 1.6? 2. the docs should probably say [requires 1.3+] etc. 3. it would be clearer if instead of [v1.2] you said [value="1.2"] 4. it is not clear what you are doing with all those vxx links. Perhaps a real-life example of use would be best, with the <param shown without having to peek at the source. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Oct 11, 4:29 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > >One (almost) solution > ><http://www.physci.org/codes/jre.html> > > 1. could you add 1.6? hmm.. I only resurrected the JRE page at the specific request of a user. I am not convinced it is a good method to use, given the vagaries of showDocument(). But.. if you wanted to update it for 1.6, you might change .. .. Class.forName("java.lang.Appendable"); javaVersionNumber++; .. ..for this.. .. Class.forName("java.lang.Appendable"); javaVersionNumber++; Class.forName("java.awt.Desktop"); javaVersionNumber++; .. It would be nice to keep the classes as all java.lang.??, but as far as I dould determine, there were no new *classes* in lang for 1.6. > 2. the docs should probably say [requires 1.3+] etc. It is compiled for Java 1.1. I thought that would be 'inuitively obvious', but your comment makes me realise my mistake*. > 3. it would be clearer if instead of [v1.2] you said [value="1.2"] Good point*. > 4. it is not clear what you are doing with all those vxx links. > Perhaps a real-life example of use would be best, with the <param > shown without having to peek at the source. Not sure I understand what you mean, but the unfortunate thing for most developers is that having a recent VM means it is very hard to see it 'redirect' - unless I include arbitrary values (version='9.3'). * Things I would change, assuming I ever revisit that page. But personally, I think JWS provides better versioning options, and applets are (largely) passe, in any case.. Andrew T. On Fri, 12 Oct 2007 03:10:16 -0000, Andrew Thompson <andrewthommo@gmail.com> wrote, quoted or indirectly quoted someone who said : >Not sure I understand what you mean, but the unfortunate >thing for most developers is that having a recent VM means >it is very hard to see it 'redirect' - unless I include >arbitrary values (version='9.3'). You need a paragraph something like: "Below are invocations of the Version Check Applet that will redirect you if your browser is not sufficiently recent. If you have the latest browser, clicking the link won't do anything." I don't understand what those links do. I know it is obvious to you, but not to me. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I have an applet written with java5. >Suppose someone tries to execute it with a jre4. >java console will print a system exception. >But how can I handle that exception properly and show a user friendly >dialog box telling that a jre update is needed ? >thanks ! I handle it with some generated boilerplate that says which version of Java is required. See http://mindprod.com/jgloss/applet/holidaycalculator.html I also have a method that checks the Java version. However, in many cases the code won't even start without a proper match. See http://mindprod.com/products1.html#COMMON11 Look for com.mindprod.common11.VersionCheck On my todo list is to write some JavaScript boiler plate to test the Java version and display a message instead of the Applet if it is bad or there is no Java at all. 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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