1. Open Quarkus perspective
2. File -> New Quarkus project -> Type: Maven, name: "testdebug" -> Finish
3. Open "ExampleResource.java" in "src/main/java/org.acme/" -> add some "System.out.println("TEST");" before return -> place a brake point on this line
4. Right click on project -> Debug as -> Debug configuration... -> Double click on "Quarkus Application" -> Debug
5. Open "localhost:8080/hello" in browser -> see console output in Eclipse

Expected: No new output, highlighted "System.out.println("TEST");" -> click "Step over" -> "TEST" printed to console output
Now: "Test" printed to output, application is not paused. Behavior as for "Run As".

NOTE: 
1. Debug WORKS fine during the Integration tests (Jenkins and local via "mvn clean verify ..."). There is a normal behavior.
2. Debug DOESN'T work if IT runs via Eclipse (Right click on test -> Run as -> Reddeer test) or during manual testing.

workaround is to run manually the java remote debugger by creating new launch configuration > Debug as Launch mode / Remote Java Application as Launch Configuration Type > click Next Then Browse the correct Project if not selected, and select the correct Port that is displayed in the console, then click Finish.