Prior to this commit, there was no way to configure type-safe rollback
rules for transactions.
Even though a rollback rule could be defined using a Class reference
via the `rollbackFor` and `noRollbackFor` attributes in @Transactional,
those Class references got converted to Strings (as the fully qualified
class names of the exception types) in RollbackRuleAttribute which then
applied a pattern-based matching algorithm as if the Class references
had been supplied as Strings/patterns to begin with, thereby losing the
type information.
Pattern-based rollback rules suffer from the following three categories
of unintentional matches.
- identically named exceptions in different packages when the pattern
does not include the package name -- for example,
example.client.WebException and example.server.WebException both
match against a "WebException" pattern.
- similarly named exceptions in the same package when a given exception
name starts with the name of another exception -- for example,
example.BusinessException and example.BusinessExceptionWithDetails
both match against an "example.BusinessException" pattern.
- nested exceptions when an exception type is declared in another
exception -- for example, example.BusinessException and
example.BusinessException$NestedException both match against an
"example.BusinessException" pattern.
This commit prevents the latter two categories of unintentional matches
for rollback rules defined using a Class reference by storing the
exceptionType in RollbackRuleAttribute and using that type in the
implementation of RollbackRuleAttribute.getDepth(Class, int), resulting
in type-safe rollback rules whenever the `rollbackFor` and
`noRollbackFor` attributes in `@Transactional` are used.
Note that the first category of unintentional matches never applied to
rollback rules created from a Class reference since the fully qualified
name of a Class reference always includes the package name.
Closes gh-28098
c1033dbfb3