Re: Re: Java 7 - ejs applet does not work with it -
Julia Branke
11 Posts
Dear Paco,
thank you for your reply,
I did some further tests after I posted the question and found out, that Java 7 is not the sole reason for my problem.
My ejs applet does actually run on MacOS X with Java 7.
It does not run as an applet on some Windows 7 Java 7 machines I tried, which lead me to post that I have a problem with Java 7, since my main computer does not have Java 7 installed.
But if I put the simulation as an application on those Windows 7 Java 7 machines the application runs fine, so Java 7 within the browser is a problem, and there the tightened security might be at the root of problems.
I did some reading and it seems the Java is forcing security at rapid rates. If I interpreted things correctly in some futher version, selfsigned applets will be strongly discouraged and might not work any more at all in the future.
But even if I put security to the minimum allowed within the browser I still could not get the applets to work within any of the browsers I tried.
I also read that new information in the Manifest Files are needed starting with Java 7. But so far I was still out of luck to even get an ejs simulation that does nothing to work, even if I tried to run a selfsigned applet with lowest security and corrected manifest file.
I have been on a holiday and will try to get on the botton of this week.
But I have to admit, that I had been running out of ideas what to try before my holiday, maybe a fresh look will help, but I also have to admit the getting applets to work in different configurations is starting to wear me out.
I thought about buying a signer certificate, to get rid of the warnings, but currently I still think selfsigned should still work and this is not the real issue (for now).
Any ideas, of where to look would be appreciated, I check the java console, I try different browsers, I try very simple ejs applets, I do have an non ejs Java 5 applet that works. I tried packing the simulation out of eclipse (file size get huge this way) but still no luck.
Any ideas are greatly appreciated, I will try them all.
Re: Re: Re: Java 7 - ejs applet does not work with it -
Wolfgang
192 Posts
Julia--
You are correct. It has become much more difficult to run applets in the latest Oracle VM due to heightened security.
Signed applets delivered from a web server do work on Windows and Mac but you must purchase a digital certificate. Many of the EJS models in the ComPADRE OSP collection have been signed and can be used as applets after they have been downloaded. (We only sign applets that have been reviewed and accepted for the Collection.) Here a links to applet pages on OSP for you to try:
Re: Re: Re: Re: Java 7 - ejs applet does not work with it -
Julia Branke
11 Posts
Dear Wolfgang,
thank you so much for giving me an easy possibility to try certificate signed applets on the Windows 7 Java 7 machines in question, I will try these applets on those machines tomorrow and post my result.
Re: Re: Re: Re: Java 7 - ejs applet does not work with it -
Julia Branke
11 Posts
Dear Wolfgang,
no luck, your two applets do not work on the Windows 7 Java 7 machines either, they just ask the usual questions and afterwards display a frame with white in it. And yes I waited for more than 5 minutes for any change.
Which is already more than my simulations do, they only display white.
I remembered having a problem displaying a 3D simulation that had two extra 2D windows with projection in them that did display and tried this simulation and sure enough the projection windows showed and the main simulation in the browser stayed white. Not sure, how this will help me though, since I do want to display the simulation in the browser window.
Getting rid of anything in the Java Settings that even remotely looked like security did not help. Lowest security available now is medium.
I enclose same traces with trace level 5, the only messages that show without tracelevel are the one similar to: Missing Permissions manifest attribute for: http://www.compadre.org/OSP/document/servefile.cfm?ID=8263&DocID=888&Attachment=1 Missing Codebase manifest attribute for: http://www.compadre.org/OSP/document/servefile.cfm?ID=8263&DocID=888&Attachment=1
But I appreciate to know that there is an issue beyond the signing problem. And on my machine your applets work fine. So they mostly behave like mine do.
Re: Re: Re: Re: Re: Java 7 - ejs applet does not work with it -
Wolfgang
192 Posts
I have retested two EJS models running as applets and they do wok on Windows 7 and 8 using Java 7 u 25 if the applet is on a server. But as Paco points out, Oracle is making it harder and harder to run applets.
Re: Re: Re: Re: Re: Re: Java 7 - ejs applet does not work with it -
Julia Branke
11 Posts
Just to clarify, the two links you gave me work for you with Java 7 Windows 7 + 8? Just to make sure before I complain that they do elsewhere to people who run our computer pool??
