JDK-8262981 added the following method to

src/java.desktop/share/classes/javax/swing/JSlider.java

/**
         * Performs the specified Action on the object
         *
         * @param i zero-based index of actions. The first action
         * (index 0) is AccessibleAction.INCREMENT and the second
         * action (index 1) is AccessibleAction.DECREMENT.
         * @return true.
         * @see #getAccessibleActionCount
         */
        public boolean doAccessibleAction(int direction) {

But the param tag uses the wrong name and so causes a doc build failure:

[2021-04-15T12:06:25,234Z] Generating JDK_API javadoc for 60 modules
[2021-04-15T12:06:55,538Z] /opt/mach5/mesos/work_dir/slaves/3c846bae-ce30-4a97-93ee-9fef4497ccb6-S79095/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/20965e7e-17f0-4e8d-a462-d66574cfcba2/runs/8aa9e345-506a-43c0-972e-2f45acf98f86/workspace/open/src/java.desktop/share/classes/javax/swing/JSlider.java:1588: error: @param name not found
[2021-04-15T12:06:55,538Z] * @param i zero-based index of actions. The first action
[2021-04-15T12:06:55,538Z] ^