spark interpreter: Java output (to the console) is lost

It could be a trivial configuration issue (in which case apologies!!  A Zeppelin newbie here), or perhaps it is a bug, in any event the output is unexpected

%spark

System.out.println("hello from java")
println("hello from scala")

only "scala" is shown in the output, whilst Java is lost.  Similarly, all output from Java through Log4j is lost as well.

The issue is critical, since we cannot currently show iteration log (convergence, and other metrics) from a Spark-Java app.

Ideas?

Thank you beforehand!!