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* GH-3079: Use getMostSpecificMethod for SpEL calls Fixes https://github.com/spring-projects/spring-integration/issues/3079 It turns out that we need to use a *most specific* method for the target to be called reflectively from the SpEL NOTE: We drop a *Method not found* error in case of wrong method source since now we find a right source via `ClassUtils.getMostSpecificMethod()` **Cherry-pick to 5.1.x** * * `@Ignore` `MethodInvokingMessageProcessorTests.testProcessMessageMethodNotFound()` instead of removal