Affects: spring boot 3.0.7

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