Spring Boot Dev Tools：使用CommandLineRunners和Spring Data Repositories进行热重新加载崩溃

时间：2016-02-05 13:27:11

标签： maven intellij-idea spring-boot spring-data

我正在开发一个使用Spring Boot 1.3.2，Spring Data MongoDB和Spring Security的项目，使用Dev Tools，使用IntelliJ IDEA 15.0.3，使用Maven。

我确实阅读了Spring Boot Developer Tools documentation，并按照指示仔细配置了所有内容，并且热重新加载工作正常。

然后，由于我需要在应用程序启动期间执行某些任务，主要是连接到数据库并执行验证，并在需要时插入，我决定使用这样的CommandLineRunner bean：

@Configuration
public class DatabaseInitializer {

   @Bean
   CommandLineRunner verifyConfiguration(ConfigurationRepository repository) {
       return args -> { 
           // The id is a provided one and i can't modify it.
           if (repository.findOne(...) == null) { // this is the offending line 
               //perform some tasks here  
           }
       };
   }

   // more CommandLineRunners following the same approach

}

如果我重新启动应用程序，一切正常，没有崩溃，没有错误，但是当我触发开发工具热重新加载时，它会失败，并抛出此堆栈跟踪：

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:809) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:790) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:777) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at com.adrisasws.gestor.CesteriaApariciApplication.main(CesteriaApariciApplication.java:15) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_72]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_72]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_72]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_72]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.3.2.RELEASE.jar:1.3.2.RELEASE]
Caused by: org.springframework.data.mapping.model.MappingInstantiationException: Failed to instantiate com.adrisasws.gestor.configuracion.api.outputs.ConfiguracionFacturacion using constructor NO_CONSTRUCTOR with arguments 
    at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:64) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:83) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:251) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1186) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:78) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1134) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:870) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:283) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:271) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:271) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:191) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:78) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2224) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1855) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1672) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.core.MongoTemplate.findById(MongoTemplate.java:614) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findOne(SimpleMongoRepository.java:119) ~[spring-data-mongodb-1.8.2.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_72]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_72]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_72]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_72]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:483) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:468) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:440) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at com.sun.proxy.$Proxy160.findOne(Unknown Source) ~[na:na]
    at com.adrisasws.gestor.Inicializacion.lambda$inicializacionConfiguracion$1(Inicializacion.java:47) ~[classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:806) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    ... 11 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.adrisasws.gestor.configuracion.api.outputs.ConfiguracionFacturacion]: Specified class is an interface
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:61) ~[spring-data-commons-1.11.2.RELEASE.jar:na]
    ... 47 common frames omitted

我知道它抱怨ConfiguracionFacturacion是一个接口，文档的一个属性被声明为接口，但在我的代码中，我总是实例化一个具体的实现，正如我所说，一切在正常启动和执行期间工作正常。

基本上我的问题是：

  • 为什么它能正常工作但热重载失败？，这是一个错误然后我应该提交一个问题吗？
  • 或者在使用@Document注释的实体类中使用抽象是一种非常糟糕的做法，我应该考虑重构？

P.S。如果您需要更多信息，请提出要求，我会更新问题。

更新：CommandLineRunner第一次运行，当数据库中的元素不存在时，findOne()调用返回null，热重新加载，不失败。

Update2 ：避免findOne()，并尽可能使用exists()和count()解决问题，但似乎不是最终的解决方案，幸运的是，在我的用例中，我不需要访问数据，只需检查它是否存在，或者知道有多少记录，但在其他一些用例中，数据访问是强制性的，开发人员无法享受DevTools热重装的好处。

如果有任何帮助，请参阅以下有关此特定问题的更多信息：

在Spring Data MongoDB的特定情况下，当@Document类中的字段被声明为接口时，则在数据库中，在表示该字段的嵌入式文档中，名为_class的属性，插入具体实现的完全限定类名的值，例如：

public class AddressDocument implements Address {
    ...
}

@Document
public class PersonDocument {
    private Address address;
    ...
}

执行以下操作时：

PersonDocument p = new PersonDocument();
p.setAddress(new AddressDocument(...));
repository.save(p);

然后存储在数据库中的mongo文档将具有以下形式：

{
    ...
    address : {
        "_class" : "package.AddressDocument",
        ...
    }
    ...
}

因此，很明显可以认为Spring Data正在使用_class来确定要使用哪个类来实例化类，并且出于某种原因，DevTools正在绕过该机制。

0 个答案:

没有答案
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