Java Autowire处的弹簧启动不工作。创建bean时出错

嗨，我有一个spring boot项目。主类包如下所示：

com.som.demo

我在项目中使用了一个外部jar作为maven依赖项。在该jar中有一个用@service注释的服务类，如下所示：

@Service
public class SomeServiceImpl implements SomeService {
      @Autowired
      private TreeCacheWrapper ffCoreCache;

      @Autowired(required = false)
      private ZookeeperProperties zookeeperProperties;

      public SomeServiceImpl(TreeCacheWrapper ffCoreCache, ZookeeperProperties zookeeperProperties) {
         this.ffCoreCache = ffCoreCache;
         this.zookeeperProperties = zookeeperProperties;
      }
}

com.som.test

这个

SomeServiceImpl

类所在的主包如下所示：

@Service
public class SomeServiceImpl implements SomeService {
      @Autowired
      private TreeCacheWrapper ffCoreCache;

      @Autowired(required = false)
      private ZookeeperProperties zookeeperProperties;

      public SomeServiceImpl(TreeCacheWrapper ffCoreCache, ZookeeperProperties zookeeperProperties) {
         this.ffCoreCache = ffCoreCache;
         this.zookeeperProperties = zookeeperProperties;
      }
}

com.som.test

现在在我的项目中，当我自动连接这个类时，我在运行SpringBoot应用程序时遇到了bean创建错误。我就是这样做的：

@Autowired
private SomeService someService;

错误：

 org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'someServiceImpl'
Unsatisfied dependency expressed through field 'ffCoreCache'; 
nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'ffCoreCache' defined in class path resource [com/som/test/config/ZooKeeperConfig.class]: 
Bean instantiation via factory method failed; 
nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [com.som.test.cache.TreeCacheWrapper]: 
Factory method 'ffCoreCache' threw exception; 
nested exception is java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry


Caused by: org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'ffCoreCache' defined in class path resource [com/som/test/config/ZooKeeperConfig.class]: 
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [com.som.test.cache.TreeCacheWrapper]: 
Factory method 'ffCoreCache' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry



Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.som.test.cache.TreeCacheWrapper]: 
Factory method 'ffCoreCache' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry

Caused by: java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry

Caused by: java.lang.ClassNotFoundException: org.apache.curator.retry.ExponentialBackoffRetry

---

当SpringBoot应用程序启动时，它会扫描主类所在包中的bean以及它下面的所有包

由于您的主类驻留在包

com.som.demo

中，因此spring boot将在该包中，或在

com.som.demo.sample1

，

com.som.demo.a.b.c

等包中找到任何bean 但是，它不会扫描

com.som.test

包，因为它是主包的“对等方”

通常，您可以通过接受要扫描的基本包列表的

@ComponentScan

注释，将spring boot配置为扫描您选择的包。您可以将此注释放在主类上（在

@SpringBootApplication

旁边）

然而，这有点违背了spring boot的惯例

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阅读更多技术细节和示例。

用@Service而不是实现类注释服务接口，并尝试用@Component注释ServiceImplementation类。

Spring boot默认情况下扫描到主包中的bean。您可以使用

@SpringBootApplication(scanBasePackages={"com.som.demo" , "com.som.test"})

---

如果您得到ClassNotFoundException，则必须将依赖项添加到项目中。