RootPaneDefaultButtonTest.java is recently pushed to the mainline in JDK-8355203 and is failing in CI for macosx-aarch64 machine.

Test Log from the CI run :

java.lang.IllegalStateException: The default button and non-default buttons should look different: java.awt.Color[r=55,g=55,b=55] matches java.awt.Color[r=55,g=55,b=55]
at RootPaneDefaultButtonTest.test(RootPaneDefaultButtonTest.java:170)
at RootPaneDefaultButtonTest.main(RootPaneDefaultButtonTest.java:80)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1447)

JavaTest Message: Test threw exception: java.lang.IllegalStateException: The default button and non-default buttons should look different: java.awt.Color[r=55,g=55,b=55] matches java.awt.Color[r=55,g=55,b=55]
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.IllegalStateException: The default button and non-default buttons should look different: java.awt.Color[r=55,g=55,b=55] matches java.awt.Color[r=55,g=55,b=55]