Short desc:
  Test JSstaticMethodDirectAccess ( see also CR 6648488 ) successfully calls 2 applets static methods, but got JS exception when constructor is executed.
The same test PASS ok with IE8, but FAILS with IE9 beta.

Exception:
message = java.lang.IllegalArgumentException: No method found matching name com.company1.JDirectUDHelper1 and arguments [sun.plugin2.main.client.MessagePassingJSObject]

Test URL:
  http://vice.russia.sun.com/newroot/testsuites/160_int_ws/deployment/src/plugin/LiveConnect/LiveConnect/html/auto/JSstaticMethodDirectAccess.html

HTML/JS code fragment which causes exception:

function runTest() {
    var passed = false;
    var excStr = null;
    try {
        // Make sure we can call a different static
        // method in each applet's namespace and instantiate a
        // different class in each applet's namespace
          passed = (applet1.Packages.com.company1.JDirectUDHelper1.passed() &&
                    applet2.Packages.com.company2.JDirectUDHelper2.passed() &&
                    (new applet1.Packages.com.company1.JDirectUDHelper1() != null) ) // &&
                    (new applet2.Packages.com.company2.JDirectUDHelper2() != null));
    } catch (e) {
        excStr = getExceptionString(e);

Line with code "new applet1.Packages.com.company1.JDirectUDHelper1()" causes mentioned exception with IE9.
Static methods JDirectUDHelper1.passed() and JDirectUDHelper2.passed() work OK.

See details, test src links, etc in comments section.