I have tried using the below property value in my application.properties to enable only logger INFO messages. But looks like it does not work as expected. I still see the WARNING messages appear along with INFO messages. But I only want INFO messages to appear, am I doing something wrong here?
logging.level.root=INFO
2018-12-21 09:46:25.312 INFO 12364 --- [nio-8081-exec-2] c.m.s.abc.util.FileUploadUtil : Sample message 1
2018-12-21 09:46:25.316 INFO 12364 --- [nio-8081-exec-2] c.m.service.abc.util.EnvelopeUtil : Sample message 2
2018-12-21 09:46:25.316 INFO 12364 --- [nio-8081-exec-2] c.m.service.abc.util.EnvelopeUtil : Sample message 3
2018-12-21 09:46:25.316 INFO 12364 --- [nio-8081-exec-2] c.m.service.abc.util.EnvelopeUtil : Sample message 4
2018-12-21 09:46:27.813 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+11 (11) in font ArialNarrow-Bold-Identity-H
2018-12-21 09:46:27.813 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+48 (48) in font ArialNarrow-Bold-Identity-H
2018-12-21 09:46:27.813 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+68 (68) in font ArialNarrow-Bold-Identity-H
2018-12-21 09:46:27.813 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+86 (86) in font ArialNarrow-Bold-Identity-H
2018-12-21 09:46:27.814 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+88 (88) in font ArialNarrow-Bold-Identity-H
2018-12-21 09:46:27.814 WARN 12364 --- [nio-8081-exec-2] o.a.pdfbox.pdmodel.font.PDType0Font : No Unicode mapping for CID+87 (87) in font ArialNarrow-Bold-Identity-H
You're not doing anything wrong, but none of the logging systems supported by Spring Boot (Logback, Log4j2, JUL) work as you expect. When you set the level for a particular logger, it will log everything at that level and above. As you have seen, that means that when INFO level logging is enabled, WARN (and ERROR) messages will also be logged.
If you want to only log messages for a specific level, you'll have to use more complex configuration. For example, Logback provides a LevelFilter that provides the behaviour you want. To configure it, you'll have to use logback.xml rather than relying solely on Spring Boot's application properties.