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Using NetBeans 8, I can no longer run JavaFX applications with JDK 7. I tried both u45 and u51. All I get is the good old "Exception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application" Switching to JDK 8 (RC) solves the problem.
*** This bug has been marked as a duplicate of bug 239388 ***