Will my plugin have a compatibility with all JIRA versions like 5.x.x if my web action class extends JiraWebActionSupport class?

[Michael I.]

The class com.atlassian.jira.action.JiraActionSupport has an annotation @PublicSpi, so my plugin will work correctly if my plugin extends it (https://developer.atlassian.com/display/JIRADEV/Java+API+Policy+for+JIRA). But can I use subclasses of the JiraActionSupport class and get the same result?

[tier-0 grump · Accepted solution]

The short answer is it's not guaranteed - the slightly longer answer is that we will try to maintain binary compatibility for those subclasses, but as they are not API we will not guarantee it. If you look at a lot of these clases they don't change very often, so you may well be safe - but we still reserve theright to break compatibility if we need to....

[Michael I.]

I understand, thank you for this answer.