springboot项目中如何创建多个模块？

Question

比如com.java.product包下面有mapper、service、controller
com.java.system包下面有mapper、service、controller，而Application在com.java包中与product和system平级，直接启动会报错，如何配置

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org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.java.Application]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'businessController' for bean class [com.java.product.controller.BusinessController] conflicts with existing, non-compatible bean definition of same name and class [com.java.controller.BusinessController]