Proguard混淆代码导致Spring自动装配失败

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最近尝试用Proguard来混淆代码，以增加发布出去的代码安全性。今天运行混淆后的jar包发生如下异常

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Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: public abc.service.Service test.rest.controller.Controller.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [abc.service.Service] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 26 more

程序很简单，接口

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public interface Service {  
    int getAge();  
}

实现类使用@Component标签实例化到spring容器中

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@Component  
public class ServiceImpl implements Service{  
    public int getAge() {  
        return new Random().nextInt(100);  
    }  
}

在Controller中使用@Autowired标签自动装配

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@Autowired  
public Service service;

原程序可以正常运行，但在混淆了代码之后，发生以上所述的异常，原因是spring找不到能够匹配的Service实例。

忙活了一整天各种测试各种查资料，终于找到解决方案，很简单

  1. 在proguard配置中加上“-keepdirectories”
  2. 保证proguard版本不低于4.4

另外附上解决前和解决后的jar包解压时候的控制台输出

这是没加“-keepdirectories”的输出

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inflated: META-INF/MANIFEST.MF
inflated: abc/service/Service.class
inflated: test/rest/controller/Controller.class
inflated: test/rest/controller/ServiceImpl.class
inflated: META-INF/maven/test/rest/pom.xml
inflated: META-INF/maven/test/rest/pom.properties

加上“-keepdirectories”之后解压

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created: META-INF/
inflated: META-INF/MANIFEST.MF
created: abc/
created: abc/service/
created: test/
created: test/rest/
created: test/rest/controller/
inflated: abc/service/Service.class
inflated: test/rest/controller/Controller.class
inflated: test/rest/controller/ServiceImpl.class
created: META-INF/maven/
created: META-INF/maven/test/
created: META-INF/maven/test/rest/
inflated: META-INF/maven/test/rest/pom.xml
inflated: META-INF/maven/test/rest/pom.properties