However, today Java is at an inflection point. Customers are facing end of lifecycle and support uncertainty (such as the upcoming end of Java 8 community support and the challenging prospect of migrating countless applications to newer but substantially different versions of Java).
I'm unaware of cases where Java 8 sources will not compile on newer JVMs.
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I'm unaware of cases where Java 8 sources will not compile on newer JVMs.
I think you're correct: Compile shouldn't be an issue, it's usually things from the standard JDK being removed.
A recent example is JAXB classes/APIs being removed from SDK into their own lib jars.
If the legacy system uses some arcane build system I could see this being an issue.
It's probably just the pain thart comes from modularization.