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In code
https://github.com/apache/tomee/blob/3c471af2c494722a52e1c465d18ae9a47acc82f7/container/openejb-core/src/main/java/org/apache/openejb/util/PropertyPlaceHolderHelper.java#L46
there is a typo in
openejb.placehodler.delimiter
should be
openejb.placeholder.delimiter
ie holder