The unit tests were not updated in conjunction with RT-32859 so they no longer compile:

$ gradle test
...
:fxml:compileTestJava
[ant:javac] C:\Users\kcr\javafx\8-kcr-gfx\jfx\rt\modules\fxml\src\test\java\com\sun\javafx\fxml\builder\ProxyBuilderTest.java:209: error: cannot find symbol
[ant:javac] pb = new ProxyBuilder(ClassWithMixedConstructors.class);
[ant:javac] ^
[ant:javac] symbol: class ClassWithMixedConstructors
[ant:javac] location: class ProxyBuilderTest
[ant:javac] C:\Users\kcr\javafx\8-kcr-gfx\jfx\rt\modules\fxml\src\test\java\com\sun\javafx\fxml\builder\ProxyBuilderTest.java:215: error: cannot find symbol
[ant:javac] ClassWithMixedConstructors result = (ClassWithMixedConstructors) pb.build();
[ant:javac] ^
[ant:javac] symbol: class ClassWithMixedConstructors
[ant:javac] location: class ProxyBuilderTest
[ant:javac] C:\Users\kcr\javafx\8-kcr-gfx\jfx\rt\modules\fxml\src\test\java\com\sun\javafx\fxml\builder\ProxyBuilderTest.java:215: error: cannot find symbol
[ant:javac] ClassWithMixedConstructors result = (ClassWithMixedConstructors) pb.build();
[ant:javac] ^
[ant:javac] symbol: class ClassWithMixedConstructors
[ant:javac] location: class ProxyBuilderTest
[ant:javac] Note: C:\Users\kcr\javafx\8-kcr-gfx\jfx\rt\modules\fxml\src\test\java\com\sun\javafx\fxml\builder\ProxyBuilderTest.java uses unchecked or unsafe operations.
[ant:javac] Note: Recompile with -Xlint:unchecked for details.
[ant:javac] 3 errors
:fxml:compileTestJava FAILED

FAILURE: Build failed with an exception.