Entry.java:
Extracted methods newMapIfNull(), getUserOrOperationalAttributes(), getAttributes(), putAttributes(), removeAttributes(), addAllIfNotNull(), onlyKeepAttributesWithAllOptions(), getAttribute(), onlyKeepAttributesWithAllOptions(), addObjectClass(), hasObjectClassOrAttribute(), hasObjectClass(), containsObjectClassByName(), hashCode(), equals(), appendAttributes(), newList().
Comments to javadoc.
Used interfaces instead of concrete classes.
Collapsed if statements.
Put code on one line where possible.

LDAPReplicationDomain.java:
Extracted methods isSolveConflict(), needReconnection(), findReplicationSearchResultEntry(), isMandatoryAttribute(), isFractionalProhibited(AttributeType), canRemoveAttribute(), contains(), runAsSynchronizedOperation().
Removed useless else.
Used interfaces instead of concrete classes.
Put code on one line where possible.
Removed useless comments.
Simplified code in several places.
Collapsed if statements.