Steps  to reproduce

1. Set JDK 11 to JAVA_HOME
2. Modify jmc/application/uitests/pom.xml file change <testFailureIgnore>false</testFailureIgnore> to true
3. Modify the build.sh to include mvn verify -P uitests -Dspotbugs.skip=true
4. Mofify org.openjdk.jmc.rcp.application.Application.java  

    display.addListener(SWT.OpenDocument, openDocProcessor);
    display.setCursorLocation(0, 0); //Add this line

1. Start UI Test  ./build.sh --testUi > Windows.log

On macOS

The execution gets stuck on JFR tests (JfrThreadsPageTest) , but proceeds if  <module>org.openjdk.jmc.flightrecorder.uitest</module> is commented in jmc/application/uitests/pom.xml

On Linux

Quite a number of JFR tests failing in linux as well.

On Windows

More number of test cases are failing on the windows platform

Attached are.

i. screen recording from macOS for JfrThreadsPageTest where the execution gets stuck.

ii. macOS, Linux, and Windows execution logs