On launch it throws

java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/Canvas
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:751)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:448)
at java.net.URLClassLoader.access$100(URLClassLoader.java:70)
at java.net.URLClassLoader$1.run(URLClassLoader.java:360)
at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:353)
at java.lang.ClassLoader.loadClass(ClassLoader.java:422)
at java.lang.ClassLoader.loadClass(ClassLoader.java:409)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:355)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2579)
at java.lang.Class.getMethod0(Class.java:2820)
at java.lang.Class.getMethod(Class.java:1719)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:555)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:537)
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.widgets.Canvas
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:353)
at java.lang.ClassLoader.loadClass(ClassLoader.java:422)
at java.lang.ClassLoader.loadClass(ClassLoader.java:355)
... 19 more

References for jfxrt.jar and swt.jar are set up.