I have a breakpoint on a line where is the System.out.println(\"test\") command.
I believe that the command is reached by execution because I see the printed string
The exec goal will execute your program in a separate process, so the debugger may not be connecting to the right JVM. Instead try using the java goal, e.g.:
mvnDebug install exec:java
This will execute your program in the same process and hopefully you will hit your breakpoint.