FULL PRODUCT VERSION :
java 1.8.0_05 or 1.7.0_60

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer 11 or 9

A DESCRIPTION OF THE PROBLEM :
Parameters given to the dtjava.js function are not passed on to the webstart application, when starting the application from Internet Explorer.

Debugging the uncompressed version of dtjava.js (https://bitbucket.org/openjfxmirrors/openjfx-8-master-rt/src/2872be3a2984e57762b4d86a0465603bf2465bf5/modules/fxpackager/src/main/resources/resources/web-files/dtjava.js?at=default )

reveals, that the old DT APIs are used, because the check in line 528 in dtjava.js returns false (ua.deploy is null on my system).

                        //check if new DT APIs are available
                        if (versionCheck("10.6+", ua.deploy)) {

The old DT API seems not to handle params.

This is a regression caused by
https://bugs.openjdk.java.net/browse/JDK-8041386

Reverting the change fixes the issue. The above check returns true.

REGRESSION. Last worked in version 7u55

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
var app = new dtjava.App(jnlpFile,
{
params: {parameter1: 'test' }
});
var platform = new dtjava.Platform({
jvm: "1.7.0_06+",
        javafx: "2.2+",
       jvmargs: "-Xmx1024m"
     });

dtjava.launch(app, platform);

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Value of parameter1 is available in application
ACTUAL -
Value of parameter1 is not available in application

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Do not include current dtjava.js