Even after getting 0 warnings in the build after JDK-8325075: Enable -Werror for javadoc to fail on any warnings
Enabling javadoc validation in Eclipse (see the screenshot) results in 137 warnings:

Description Resource Type Path Location
Javadoc: Description expected after @return AudioClip.java Java Problem /media/src/main/java/com/sun/media/jfxmedia line 313
Javadoc: Description expected after @return D3DContext.java Java Problem /graphics/src/main/java/com/sun/prism/d3d line 76
Javadoc: Description expected after @return DefaultCancelButtonTestBase.java Java Problem /controls/src/test/java/test/javafx/scene/control line 93
Javadoc: Description expected after @return DefaultCancelButtonTestBase.java Java Problem /controls/src/test/java/test/javafx/scene/control line 152
Javadoc: Description expected after @return Direction.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/traversal line 56
Javadoc: Description expected after @return EmbeddedScene.java Java Problem /graphics/src/main/java/com/sun/javafx/tk/quantum line 225
Javadoc: Description expected after @return FilterEffect.java Java Problem /graphics/src/main/java/com/sun/scenario/effect line 155
Javadoc: Description expected after @return GeneralTransform3D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom/transform line 136
Javadoc: Description expected after @return InputMap.java Java Problem /controls/src/main/java/com/sun/javafx/scene/control/inputmap line 308
Javadoc: Description expected after @return InputMap.java Java Problem /controls/src/main/java/com/sun/javafx/scene/control/inputmap line 678
Javadoc: Description expected after @return Logging.java Java Problem /base/src/main/java/com/sun/javafx/binding line 44
Javadoc: Description expected after @return PickRay.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 240
Javadoc: Description expected after @return PluginListener.java Java Problem /web/src/main/java/com/sun/webkit/plugin line 49
Javadoc: Description expected after @return PropertyReference.java Java Problem /base/src/main/java/com/sun/javafx/property line 96
Javadoc: Description expected after @return QuantumClipboard.java Java Problem /graphics/src/main/java/com/sun/javafx/tk/quantum line 148
Javadoc: Description expected after @return QuantumClipboard.java Java Problem /graphics/src/main/java/com/sun/javafx/tk/quantum line 172
Javadoc: Description expected after @return SkinStub.java Java Problem /controls/src/test/java/test/javafx/scene/control line 81
Javadoc: Description expected after @return StyleManager.java Java Problem /graphics/src/main/java/com/sun/javafx/css line 1933
Javadoc: Description expected after @return StyleManager.java Java Problem /graphics/src/main/java/com/sun/javafx/css line 1948
Javadoc: Description expected after @return TableSkinShim.java Java Problem /controls/src/shims/java/javafx/scene/control/skin line 67
Javadoc: Description expected after @return TableSkinShim.java Java Problem /controls/src/shims/java/javafx/scene/control/skin line 79
Javadoc: Description expected after @return TraversalEngine.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/traversal line 136
Javadoc: Invalid param tag name LinearGradientContext.java Java Problem /graphics/src/main/java/com/sun/prism/impl/paint line 105
Javadoc: Invalid param tag name RadialGradientContext.java Java Problem /graphics/src/main/java/com/sun/prism/impl/paint line 151
Javadoc: Invalid param tag name RadialGradientPaintContext.java Java Problem /graphics/src/main/java/com/sun/prism/j2d/paint line 171
Javadoc: Invalid reference AndroidFontFinder.java Java Problem /graphics/src/main/java/com/sun/javafx/font line 52
Javadoc: Invalid reference package-info.java Java Problem /base/src/main/java/javafx/beans/binding line 27
Javadoc: Invalid tag TableViewTest.java Java Problem /controls/src/test/java/test/javafx/scene/control line 868
Javadoc: Invalid tag TableViewTest.java Java Problem /controls/src/test/java/test/javafx/scene/control line 2055
Javadoc: Malformed reference (missing end space separator) GradientColorMap.java Java Problem /graphics/src/main/java/com/sun/pisces line 33
Javadoc: Missing #: "applies(Styleable)} method except it also returns" Selector.java Java Problem /graphics/src/main/java/javafx/css line 119
Javadoc: Missing #: "close()" PickResultChooser.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/input line 108
Javadoc: Missing #: "Effect.filter()} operation and it is queried for" RenderState.java Java Problem /graphics/src/main/java/com/sun/scenario/effect/impl/state line 34
Javadoc: Missing #: "getSourceRegion(Rectangle, Rectangle, Rectangle)} method." EffectPeer.java Java Problem /graphics/src/main/java/com/sun/scenario/effect/impl line 205
Javadoc: Missing #: "getTextureCoordinates(float[],float,float,float,float,Rectangle,BaseTransform)}." EffectPeer.java Java Problem /graphics/src/main/java/com/sun/scenario/effect/impl line 277
Javadoc: Missing #: "managed()} method and support for sharing" BaseResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 32
Javadoc: Missing #: "managed()} method will only indicate the amount of the resource" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 37
Javadoc: Missing #: "max()}" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 34
Javadoc: Missing #: "max()} method, larger than the amount" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 131
Javadoc: Missing #: "max()} method, larger than the amount returned by the" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 110
Javadoc: Missing #: "max()} method." ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 121
Javadoc: Missing #: "origTarget()} method, and may change over time." ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 111
Javadoc: Missing #: "origTarget()} method." ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 132
Javadoc: Missing #: "Path2D(Shape, BaseTransform) Path2D}" Path2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 1995
Javadoc: Missing #: "Platform.exit()}." Util.java Java Problem /systemTests-test/java/test/util line 381
Javadoc: Missing #: "setCompositeRule(int), PiscesRenderer.setComposite(int, float)" RendererBase.java Java Problem /graphics/src/main/java/com/sun/pisces line 57
Javadoc: Missing #: "setCompositeRule(int), setComposite(int, float)" RendererBase.java Java Problem /graphics/src/main/java/com/sun/pisces line 44
Javadoc: Missing #: "setCompositeRule(int), setComposite(int, float)" RendererBase.java Java Problem /graphics/src/main/java/com/sun/pisces line 50
Javadoc: Missing #: "target()} method will return" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 38
Javadoc: Missing #: "used()}" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 92
Javadoc: Missing #: "used()} and {@link max()}" ResourcePool.java Java Problem /graphics/src/main/java/com/sun/prism/impl line 34
Javadoc: Missing closing brace for inline tag GlassRobot.java Java Problem /graphics/src/main/java/com/sun/glass/ui line 168
Javadoc: Missing closing brace for inline tag GlassRobot.java Java Problem /graphics/src/main/java/com/sun/glass/ui line 168
Javadoc: Missing closing brace for inline tag ListView.java Java Problem /controls/src/main/java/javafx/scene/control line 165
Javadoc: Missing closing brace for inline tag Path2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 811
Javadoc: Missing closing brace for inline tag Path2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 913
Javadoc: Missing closing brace for inline tag PhongMaterial.java Java Problem /graphics/src/main/java/javafx/scene/paint line 405
Javadoc: Missing closing brace for inline tag TableView.java Java Problem /controls/src/main/java/javafx/scene/control line 275
Javadoc: Missing closing brace for inline tag TreeTableView.java Java Problem /controls/src/main/java/javafx/scene/control line 302
Javadoc: Missing closing brace for inline tag TreeView.java Java Problem /controls/src/main/java/javafx/scene/control line 146
Javadoc: Unexpected tag Arc2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 202
Javadoc: Unexpected tag BackgroundPositionConverter.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/layout/region line 86
Javadoc: Unexpected tag BackgroundSizeConverter.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/layout/region line 83
Javadoc: Unexpected tag BorderConverter.java Java Problem /graphics/src/main/java/javafx/scene/layout line 196
Javadoc: Unexpected tag BorderImageSliceConverter.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/layout/region line 76
Javadoc: Unexpected tag BorderStyleConverter.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/layout/region line 159
Javadoc: Unexpected tag ClipShapeTest.java Java Problem /systemTests-test/java/test/com/sun/marlin line 91
Javadoc: Unexpected tag DashedRectTest.java Java Problem /systemTests-test/java/test/com/sun/marlin line 58
Javadoc: Unexpected tag FXCanvas.java Java Problem /swt/src/main/java/javafx/embed/swt line 275
Javadoc: Unexpected tag FXCanvas.java Java Problem /swt/src/main/java/javafx/embed/swt line 275
Javadoc: Unexpected tag HugePolygonClipTest.java Java Problem /systemTests-test/java/test/com/sun/marlin line 68
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 51
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 61
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 75
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 83
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 91
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 99
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 116
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 129
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 147
Javadoc: Unexpected tag IosApplication.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 161
Javadoc: Unexpected tag IosClipboardDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 33
Javadoc: Unexpected tag IosImageLoader.java Java Problem /graphics/src/main/java/com/sun/javafx/iio/ios line 206
Javadoc: Unexpected tag IosImageLoader.java Java Problem /graphics/src/main/java/com/sun/javafx/iio/ios line 218
Javadoc: Unexpected tag IosImageLoaderFactory.java Java Problem /graphics/src/main/java/com/sun/javafx/iio/ios line 57
Javadoc: Unexpected tag IosImageLoaderFactory.java Java Problem /graphics/src/main/java/com/sun/javafx/iio/ios line 65
Javadoc: Unexpected tag IosMenuBarDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 39
Javadoc: Unexpected tag IosMenuBarDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 48
Javadoc: Unexpected tag IosMenuBarDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 57
Javadoc: Unexpected tag IosMenuBarDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 66
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 40
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 49
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 58
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 67
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 76
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 85
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 94
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 103
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 112
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 121
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 130
Javadoc: Unexpected tag IosMenuDelegate.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 139
Javadoc: Unexpected tag IosPlatformFactory.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 37
Javadoc: Unexpected tag IosPlatformFactory.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 45
Javadoc: Unexpected tag IosPlatformFactory.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 53
Javadoc: Unexpected tag IosPlatformFactory.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 61
Javadoc: Unexpected tag IosPlatformFactory.java Java Problem /graphics/src/main/java/com/sun/glass/ui/ios line 69
Javadoc: Unexpected tag Line2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 133
Javadoc: Unexpected tag Line2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 139
Javadoc: Unexpected tag Line2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 145
Javadoc: Unexpected tag Line2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 151
Javadoc: Unexpected tag ListViewSkin.java Java Problem /controls/src/main/java/javafx/scene/control/skin line 451
Javadoc: Unexpected tag LocalStorageAccessTest.java Java Problem /systemTests-test/java/test/com/sun/webkit line 40
Javadoc: Unexpected tag MainThreadTest.java Java Problem /systemTests-test/java/test/com/sun/webkit line 37
Javadoc: Unexpected tag PNTMeshVertexBufferLengthTest.java Java Problem /systemTests-test/java/test/com/sun/prism/impl line 62
Javadoc: Unexpected tag Path2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 1432
Javadoc: Unexpected tag Path2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 1473
Javadoc: Unexpected tag Path2DGrowTest.java Java Problem /graphics/src/test/java/test/com/sun/javafx/geom line 34
Javadoc: Unexpected tag Platform.java Java Problem /graphics/src/main/java/javafx/application line 108
Javadoc: Unexpected tag PseudoClassImpl.java Java Problem /graphics/src/main/java/com/sun/javafx/css line 39
Javadoc: Unexpected tag PulseReceiver.java Java Problem /graphics/src/main/java/com/sun/scenario/animation/shared line 42
Javadoc: Unexpected tag QPathTest.java Java Problem /systemTests-test/java/test/com/sun/marlin line 62
Javadoc: Unexpected tag QuadCurve2D.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 138
Javadoc: Unexpected tag Rectangle.java Java Problem /3DViewer/src/main/java/com/javafx/experiments/utils3d/geom line 661
Javadoc: Unexpected tag Rectangle.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 639
Javadoc: Unexpected tag RepeatStructConverter.java Java Problem /graphics/src/main/java/com/sun/javafx/scene/layout/region line 66
Javadoc: Unexpected tag ScaleX0Test.java Java Problem /systemTests-test/java/test/com/sun/marlin line 63
Javadoc: Unexpected tag Shape.java Java Problem /graphics/src/main/java/com/sun/javafx/geom line 982
Javadoc: Unexpected tag ShapeCacheTest.java Java Problem /systemTests-test/java/test/com/sun/prism/impl/ps line 58
Javadoc: Unexpected tag TableViewSkin.java Java Problem /controls/src/main/java/javafx/scene/control/skin line 205
Javadoc: Unexpected tag TestNodeBase.java Java Problem /graphics/src/test/java/test/com/sun/javafx/css line 253
Javadoc: Unexpected tag TreeTableViewSkin.java Java Problem /controls/src/main/java/javafx/scene/control/skin line 256
Javadoc: Unexpected tag TriangleMesh.java Java Problem /graphics/src/main/java/javafx/scene/shape line 854
Javadoc: Unexpected tag Window.java Java Problem /graphics/src/main/java/javafx/stage line 821
Javadoc: Unexpected text Node.java Java Problem /graphics/src/main/java/javafx/scene line 1175
Javadoc: Unexpected text Node.java Java Problem /graphics/src/main/java/javafx/scene line 1235
Javadoc: Unexpected text Node.java Java Problem /graphics/src/main/java/javafx/scene line 1275