replace this loop with a while iterator and the call rows.remove(row) with iterator.remove()
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This is because there are rows being delete from the rows list while looping over them
https://github.com/aerogear/aerogear-simplepush-server/blob/c8dde71a5eb94ae53c3ab1057ba90ecbe8991745/datastores/couchdb/src/main/java/org/jboss/aerogear/simplepush/server/datastore/CouchDBDataStore.java#L228
replace this loop with a while iterator and the call rows.remove(row) with iterator.remove()