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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">As Rod says, the design we have (beans, properties, and an initialize phase) is intentional, and it means that the majority of classes (stages, in particular) can't be immutable. We did try working with constructors more at one point, but again as Rod points out that really didn't work well with Spring in particular, so we've moved away from it.</p> <p style="margin: 10px 0 0 0">If we intended the system to be configured by code rather than by XML bean configuration files, nowadays the trendy option would be fluent builders and immutable result classes. It doesn't work for XML or Spring in general, though. In addition, it would be a completely different product: every class, test, and existing configuration would need to be rewritten from scratch to go that route. If you wanted both, you'd still end up needing to provide the existing non-immutable classes so, not really much benefit for the rewrite. Anything like this is definitely out of scope for V1.</p> <p style="margin: 10px 0 0 0">Immutability does reduce the number of places thread safety presents difficulties, so of course I want to use it as much as possible. In fact, a number of internal changes have been made in that direction already (the way collection-type properties are stored, for example).</p> <p style="margin: 10px 0 0 0">I will note that, given that the first preview of the new "records" feature was shipped in Java 14, and that the second preview will be shipped in Java 15, it's almost certain to be something that could be used in a product that used the next Java LTS release (17) as a baseline. Getting past Java 11 is still several years off, of course.</p> </td>
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