2b5ca63339
As of Java 18, the serial lint warning in javac has been expanded to check for class fields that are not marked as `Serializable`. See https://www.oracle.com/java/technologies/javase/18all-relnotes.html#JDK-8202056 In the Spring Framework codebase, this can happen with `Map`, `Set` or `List` attributes which are often assigned with an unmodifiable implementation variant. Such implementations are `Serializable` but cannot be used as field types. This commit ensures that the following changes are applied: * fields are marked as transient if they can't be serialized * classes are marked as `Serializable` if this was missing * `@SuppressWarnings("serial")` is applied where relevant |
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