Based on the given subject context data, retrieves the previously persisted serialized identity, or
{@code null} if there is no available data. The context map is usually populated by a {@link Subject.Builder}
implementation. See the {@link SubjectFactory} class constants for Shiro's known map keys.
@param subjectContext the contextual data, usually provided by a {@link Subject.Builder} implementation, that
is being used to construct a {@link Subject} instance. To be used to assist with data
lookup.
@return the previously persisted serialized identity, or {@code null} if there is no available data for the
Subject.
Based on the given subject context data, retrieves the previously persisted serialized identity, or {@code null} if there is no available data. The context map is usually populated by a {@link Subject.Builder} implementation. See the {@link SubjectFactory} class constants for Shiro's known map keys.
@param subjectContext the contextual data, usually provided by a {@link Subject.Builder} implementation, that is being used to construct a {@link Subject} instance. To be used to assist with data lookup. @return the previously persisted serialized identity, or {@code null} if there is no available data for the Subject.