Sam Brannen
ba13cae6cc
TextMessage.getText() and ObjectMessage.getObject() may both return null per the JMS specification when the message body was never set, but SimpleMessageConverter.fromMessage() and its parent MessageConverter interface currently declare a non-null return type despite residing in an @NullMarked package. To address that, this commit updates MessageConverter.fromMessage(), SimpleMessageConverter, and the protected extractStringFromMessage()/extractSerializableFromMessage() methods to declare @Nullable accordingly and propagate the resulting nullability through MessagingMessageConverter and AbstractAdaptableMessageListener/MessageListenerAdapter, raising a clear MessageConversionException where a non-null payload is required by the Message<T> contract. Closes gh-37148
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