Starting with 3.1.1-b07, the embedded container always prints reporting output to stdout, which interferes with applications that print data to stdout to be consumed by other programs (e.g. in a pipeline). This is a regression from 3.1, where no such output was emitted.
A test case is attached, with profiles for 3.1.1 (the final release), 3.1.1-b07 (the initial build exhibiting the issue), 3.1.1-b06 (the latest build not exhibiting the issue), and 3.1. Running 'mvn package' with the appropriate profile executes the test case. The expected output is a single line with "Hello!" during the execution of the exec:exec goal.