GH-2723: Fix NPE in DelegatingInvocableHandler #2724
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Resolves spring-projects#2723 Previously, it was possible for `handlerReturnsMessage` to return `null` when a `cachedHandlers` was present, causing an NPE when unboxing the `Boolean` value. Ensure that the `handlerReturnsMessage` map is populated before adding the handler to `cachedHandlers`. **cherry-pick to 2.9.x**
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Resolves #2723
Previously, it was possible for
handlerReturnsMessageto returnnullwhen acachedHandlerswas present, causing an NPE when unboxing theBooleanvalue.Ensure that the
handlerReturnsMessagemap is populated before adding the handler tocachedHandlers.cherry-pick to 2.9.x