reduce java logging (#2659)

diff --git a/lib/java/src/test/resources/log4j.properties b/lib/java/src/test/resources/log4j.properties
index ab9beba..733994b 100644
--- a/lib/java/src/test/resources/log4j.properties
+++ b/lib/java/src/test/resources/log4j.properties
@@ -1,5 +1,5 @@
 # log4j configuration used during build and unit tests
-log4j.rootLogger=debug,stdout
+log4j.rootLogger=warn,stdout
 log4j.threshold=ALL
 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout