Duplicate :
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calls from JDK9 or later JDK8 deployment code to showBlockedDialog() result in a AbstractMethodException when run with JDK7 or JDK8 before 8u20. This method in com.sun.deploy.uitoolkit.ui.UIFactory should be made non-abstract, and some default implementation should be used. you can see this installing JDK9 and 7u80 then run: http://oklahoma.us.oracle.com/www/tests/dialogs/jnlp/fx7.jnlp look at 11: showBlockedDialog()
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