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Due to Sling bug (https://issues.apache.org/jira/browse/SLING-3944) which is present in the Service Pack 1, Slice 4.2 may not start properly, resulting in Peaberry bundle being not active. To fix this problem it is suggested to either:
1) upgrade org.apache.sling.scripting.java bundle to version 2.0.12 which fixes the issue with incorrect export of javax.inject package (http://mvnrepository.com/artifact/org.apache.sling/org.apache.sling.scripting.java/2.0.12); or
2) install SP2 which contains above bundle