Two cases in javaws/association failed even with very old jre9(b46) on Ubuntu 16.04 x64(sca00alt.us.oracle.com). Seems this machine doesn't support association. When I run the following code:
private boolean isAssociationSupport() {

        if (System.getProperty("os.name").contains("Windows")) {
            System.out.println("Windows case");
            return true;
        } else {
            String getGNOME = System.getenv("GNOME_DESKTOP_SESSION_ID");

            if (getGNOME != null) {
                System.out.println("gnome case. getGNOME = "+getGNOME);
                return true;
            } else {
                MsgPrinter.printErr(
                        "The OS:" + osName + " doesn't support association");
                return false;
            }

        }
    }
I got "gnome case. getGNOME = this-is-deprecated".
Need further check.

Affected tests:
RULE AssociationSuiteTest::testAssociationAlways any any
RULE AssociationSuiteTest::testAssociationAndCheck any any