Namespace

Symfony\Component\Security\Acl\Exception

AclAlreadyExistsException This exception is thrown when someone tries to create an ACL for an object identity that already has one.
AclNotFoundException This exception is thrown when we cannot locate an ACL for a passed ObjectIdentity implementation.
ConcurrentModificationException This exception is thrown whenever you change shared properties of more than one ACL of the same class type concurrently.
InvalidDomainObjectException This exception is thrown when ObjectIdentity fails to construct an object identity from the passed domain object.
NoAceFoundException This exception is thrown when we cannot locate an ACE that matches the combination of permission masks and security identities.
NotAllAclsFoundException This exception is thrown when you have requested ACLs for multiple object identities, but the AclProvider implementation failed to find ACLs for all identities.

Exceptions

Exception Base ACL exception
SidNotLoadedException This exception is thrown when ACEs for an SID are requested which has not been loaded from the database.