Provide a decent default toString() implementation for entity beans (that don't have an implementation)

[rbygrave]

For entity beans that do not already have a toString() implementation ... Ebean enhancement can provide a good default implementation.

The implementation needs to take into account recursion (e.g. bidirectional parent child relationships) and not invoke any interception or lazy loading.

Lazy loading / no interception

This isn't really a thing/issue. Ebean enhancement already ensures that there is no interception with any toString() implementation. Just stating it for completeness and to be explicit.

Recursion

This is a thing that we hit most of the time with entity beans so important and good that this deals with it. A lot of entities have the classic bidirectional parent -> OneToMany -> children ... with those children having the ... child -> ManyToOne -> parent. So a naive toString implementation would often result in an infinite loop (just like for example JSON serialisation). So it's good that this implementation deals with this.

Examples:

Customer@0(id:1, status:GOOD, inactive:false, name:usingConnection, version:1, whenCreated:2022-04-11 13:47:07.198, whenUpdated:2022-04-11 13:47:07.198)

Note that the @0 is the bean 'index' value of zero. When we get recursion, the content isn't repeated but instead includes something like Customer@0 that points back to the bean [that has already been output].