I could see following exception by TextField.setFont(...)

=====================
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
        at java.desktop/javax.swing.plaf.basic.BasicTextUI$UpdateHandler.layoutContainer(BasicTextUI.java:2061)
        at java.desktop/java.awt.Container.layout(Container.java:1537)
        at java.desktop/java.awt.Container.doLayout(Container.java:1526)
        at java.desktop/java.awt.Container.validateTree(Container.java:1722)
        at java.desktop/java.awt.Container.validate(Container.java:1657)
        at java.desktop/sun.awt.X11.XTextFieldPeer.setFont(XTextFieldPeer.java:290)
        at java.desktop/java.awt.Component.validate(Component.java:2976)
        at java.desktop/java.awt.Container.validateTree(Container.java:1740)
        at java.desktop/java.awt.Container.validate(Container.java:1657)
        at java.desktop/sun.awt.X11.XTextFieldPeer.setFont(XTextFieldPeer.java:290)
        at java.desktop/java.awt.Component.validate(Component.java:2976)
        at java.desktop/java.awt.Container.validateTree(Container.java:1740)
...
=====================

It seemed that sun.awt.X11.XTextFieldPeer.setFont(...) was called recursively.

Mail thread started on August, 2018,
http://mail.openjdk.java.net/pipermail/awt-dev/2018-August/014240.html
http://mail.openjdk.java.net/pipermail/awt-dev/2018-September/014267.html

Review approval:
http://mail.openjdk.java.net/pipermail/awt-dev/2018-October/014403.html
http://mail.openjdk.java.net/pipermail/awt-dev/2018-October/014552.html

JDK-8212677's test case code was merged:
Review approval:
http://mail.openjdk.java.net/pipermail/awt-dev/2018-December/014829.html

Another review was requested. The test case did not have "@test" tag
http://mail.openjdk.java.net/pipermail/awt-dev/2018-December/014860.html