Dynamically adding JRE for IE, Java Security Warnings, & Next Gen Plugin.

Question

I wrote an portal application to control the environment for a third party application, the portal uses a JRE version that I supply with it, this was to ensure that users are using the same JRE so any issues can be limited to one version of Java. The only piece of the application that I could not specify the JRE version and path was for Internet Explorer. Please keep in mind that I do not control when the system JRE is updated or not, this is pushed to our systems and the latest JRE would be enabled automatically. I wanted to be able to dynamically add and enable the version of the JRE that Microsoft Internet Explorer uses for applets. So I was digging around recently and if I have the next-generation plugin enabled I could programmatically update the deployment.properties file prior to launching Internet Explorer(assuming I have closed all prior instances of IE that were running) to add and enable a version of the JRE which I choose to use. When I launch IE and run an applet I see that it is using the JRE I had dynamically supplied. However everytime I run the applet a Java security warning comes up saying "The application requires an earlier version of Java", I wanted to suppress this message but after research I tried adding 'deployment.security.mixcode=HIDE_RUN' to the deployment.properties, that did not work. I tried disabling the Next Generation Plugin, that worked to suppress the message however internet explorer was no longer using my dynamically supplied JRE for applets in IE, so that was not going to work for my purposes. My questions are:
1. Is there a reliable way(not using ssvagent) to programmatically enable and disable Java's Next Generation Plugin option? (I want to make sure it is enabled when launching third party application from the portal)
2. Is there a programmatic way to suppress the Java Security Warning "The application requires an earlier version of Java", without disabling Java's Next Generation Plugin option?
deployment.properties entries after addition of my jre entry:
#deployment.properties
#Fri Sep 28 14:09:24 PDT 2012
deployment.javapi.lifecycle.exception=true
deployment.trace=true
deployment.javaws.viewer.bounds=323,144,720,360
deployment.javaws.autodownload=NEVER
deployment.version=6.0
deployment.browser.path=C\:\\Program Files (x86)\\Internet Explorer\\iexplore.exe
deployment.security.mixcode=HIDE_RUN
deployment.log=true
deployment.console.startup.mode=SHOW
deployment.capture.mime.types=true
#Java Deployment jre's
#Fri Sep 28 14:09:24 PDT 2012
deployment.javaws.jre.0.registered=true
deployment.javaws.jre.0.platform=1.6
deployment.javaws.jre.0.osname=Windows
deployment.javaws.jre.0.path=C\:\\Program Files (x86)\\Java\\jre6\\bin\\javaw.exe
deployment.javaws.jre.0.product=1.6.0_33
deployment.javaws.jre.0.osarch=x86
deployment.javaws.jre.0.location=http\://java.sun.com/products/autodl/j2se
deployment.javaws.jre.0.enabled=false
deployment.javaws.jre.0.args=
deployment.javaws.jre.1.enabled=true
deployment.javaws.jre.1.registered=true
deployment.javaws.jre.1.osname=Windows
deployment.javaws.jre.1.location=http\\\://java.sun.com/products/autodl/j2se
deployment.javaws.jre.1.osarch=x86
deployment.javaws.jre.1.path=C\:\\Portal\\dist\\java\\jre6\\bin\\javaw.exe
deployment.javaws.jre.1.platform=1.6
deployment.javaws.jre.1.product=1.6.0_29
Note: The reason not to use most recent version of Java is the necessity to test the third party application prior to deployment of a new Java version and since I do not control when a new version of Java is deployed and enabled to our machines, I am required to find an transparent solution. I understand the security issues by doing so, but the time between testing and acceptance of a new Java version for our application is within an acceptable timeframe. On exiting the application, I would restore the JRE settings and restore previous settings, to minimize the exposure of a potential security risk. Also any manual configurations are trying to be avoided as to maintain transparency to the user.

Answer 1

I'm having a similar problem and I think it is related with this.
If, after a Java--->Javascript call, a Javascript--->Java call isn't made soon after the first, it works. But, if the Java--->Javascript call triggers a Javascript--->Java call, any Java--->Javascript call that is made after that doesn't reach Javascript :/
I have a method that handles the Java--->Javascript calls and goes something like this:
System.out.println("Calling Javascript...");
JSObject win = JSObject.getWindow(this);
win.call(jsEventHandler, new Object[] { json.toString() });
System.out.println("Done.");I further found out that, after looking at the Java debug console in the scenario where a Java--->Javascript call triggers a Javascript--->Java call, only after this last method returns is the "Done" message printed, even though the respective Javascript call was already invoked.
Could you explain in more detail the queue based solution you found? Any other ideas?
Regards,
André Tavares.