org.springframework.messaging.MessagingException: unsupported return type for router [class java.lang.Class]

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AbstractMappingMessageRouter fails when channelKey is resolved to Class<?>

unsupported return type for router [class java.lang.Class]

AbstractMappingMessageRouter fails when channelKey is resolved to Class<?>

unsupported return type for router [class java.lang.Class]

org.springframework.messaging.MessagingException: unsupported return type for router [class java.lang.Class]	at org.springframework.integration.router.AbstractMappingMessageRouter.addToCollection(AbstractMappingMessageRouter.java:296)	at org.springframework.integration.router.AbstractMappingMessageRouter.determineTargetChannels(AbstractMappingMessageRouter.java:186)	at org.springframework.integration.router.AbstractMessageRouter.handleMessageInternal(AbstractMessageRouter.java:182)	at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)