Spring Update SimpleApplicationEventMulticaster.java

@Override
public void multicastEvent(final ApplicationEvent event, @Nullable ResolvableType eventType) {
    ResolvableType type = (eventType != null ? eventType : resolveDefaultEventType(event));

//Here getTaskExecutor () method to get the foreach loop outside the performance can be optimized Executor executor = getTaskExecutor(); for (final ApplicationListener<?> listener : getApplicationListeners(event, type)) {
if (executor != null) { executor.execute(() -> invokeListener(listener, event)); } else { invokeListener(listener, event); } } }

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Comment From: snicoll

Thanks for the PR and sorry it took so long but this optimization is no longer applicable.