Indicates whether an entry with the specified DN exists in the backend. The default implementation obtains a read lock and calls {@code getEntry}, but backend implementations may override this with a more efficient version that does not require a lock. The caller is not required to hold any locks on the specified DN.
@param entryDN The DN of the entry for which to determineexistence.
@return {@code true} if the specified entry exists in thisbackend, or {@code false} if it does not.
@throws DirectoryException If a problem occurs while trying tomake the determination.
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