Package com.atlassian.annotations

Contains a set of annotations that are used to identify and document a product's API.

See:
Description

Annotation Types Summary

ExperimentalApi	Indicates that program elements that this annotation is applied to is considered usable by external developers but its contracts have not stabilized.
Internal	The annotated element is an internal implementation detail and will change without notice.
PublicApi	The annotated element is part of a product's API contract with plugins.
PublicSpi	The annotated element is part of a product's SPI contract with plugins.

Package com.atlassian.annotations Description

Contains a set of annotations that are used to identify and document a product's API. API elements carry with them a guarantee of binary compatibility with future versions, meaning that clients that are compiled against version X are generally guaranteed to run on version X+1 without needing to be recompiled (the exact guarantee will vary depending on the product's API policy).

Binary compatibility is defined in chapter 13 of the Java Language Specification.