Spring NPE in ReactiveTransactionSupport.unwrapIfResourceCleanupFailure

Affects: spring boot 3.0.7

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in method unwrapIfResourceCleanupFailure of org.springframework.transaction.interceptor.TransactionAspectSupport.ReactiveTransactionSupport class if ex.getMessage() returns null then we get NullPointerException:

            if (ex instanceof RuntimeException &&
                    ex.getCause() != null &&
                    ex.getMessage().startsWith("Async resource cleanup failed")) {
                return ex.getCause();
            }

https://github.com/spring-projects/spring-framework/blob/main/spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAspectSupport.java#L1088

Comment From: jhoeller

This seems to be a regression caused by #27572. To be revised for 6.0.10.