com.atlassian.jira.issue.link
Interfaces 
IssueLink
IssueLinkCreator
IssueLinkManager
IssueLinkType
IssueLinkTypeDestroyer
IssueLinkTypeManager
LinkCollection
RemoteIssueLinkManager
RemoteIssueLinkStore
Classes 
DefaultIssueLinkCreator
DefaultIssueLinkManager
DefaultIssueLinkTypeManager
DefaultRemoteIssueLinkManager
IssueLinkDisplayHelper
IssueLinkImpl
IssueLinkTypeDestroyerImpl
IssueLinkTypeImpl
LinkCollectionImpl
MemoryRemoteIssueLinkStore
RemoteIssueLink
RemoteIssueLinkBuilder
RemoteIssueLinkStoreImpl
SequenceIssueLinkComparator
Enums 
Direction