I can get a simple Java app stdout (deployed using cf push JavaClass) to
go to firehose as logging messages. However, when I deployed a Spring Boot
app, I don't get the logging (to stdout) messages from the firehose. If I
just ran the Spring Boot app alone (using java -jar SpringBootApp.jar
instead of cf push SpringBootApp.jar), I could get the messages coming out
in the console or log file that I configured through log4j. System.out also
works fine in the console. So, why stdout doesn't work from a Spring Boot
app for firehose collection? How is it different from a plain Java app
which works fine for firehose?

Thanks!