title: What is the difference between "-Dmaven.test.skip.exec" vs "-Dmaven.test.skip=true" and "-DskipTests"?
body: <p>I am not sure what the difference between the maven directives <code>-Dmaven.test.skip.exec</code> and <code>-Dmaven.test.skip=true</code> <code>-DskipTests</code> are. Both seem to suppress the testing cycle.</p>