启动后报错内容为：
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException:
Unexpected exception parsing XML document from URL [config/spring-context.xml];
nested exception is java.lang.IllegalStateException:
Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher
报错原因：因为dubbo jar包中包含低版本的spring，所以在引入dubbo是需要将spring包排除掉：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
</exclusions>
</dependency>