Problem (warning msg) started seen from 1.4.2_17-rev-b13. 1.4.2_18-fcs j4b bundle also has the same warning msg.
It was introduced during build m/c change for J4B. No issue with the functionality of the bundle.
# By default, /bin/rpm generates a .rpm files which contains files owned
# by the builder (in Javasoft's case, the user 'java_re'). When
# the .rpm is installed, /bin/rpm tries to set file ownership based on
# ownership within the .rpm bundle. If the original file owner does not
# exist on the install system, then warnings like:
# "user java_re does not exist - using root"
# are generated for each installed file. The install works, but many
# messages are displayed. We have chosen to force the /bin/rpm executable
# to setuid of all rpm bundle files, and the .rpm file itself, to 'root'.
# We do this by modifying the /bin/rpm executable in the following as
# chmod 4755 /bin/rpm .