带有外部 jar 的 Spring Boot 'Not a Managed Type'

Question

我有一个 spring 应用程序，它正在拉一个公用罐。这个 jar 有带注释的 DTO 类。运行 mvn clean build 命令运行成功并构建 jar。一旦我运行 java -jar target/MyApp-1.0.0.BUILD-SNAPSHOT.jar 我会得到以下错误。

我打开了 MyApp-1.0.0.BUILD-SNAPSHOT.jar 并在该 jar 中找到了我的所有类。

我已经在我的快照中打开了包含 MyApplicationJobDTO 的 jar 并验证了文件在那里。

似乎在运行时 java 找不到该类，即使该类在那里。我不相信我应该向 java 类路径添加任何内容，因为 jar 位于快照 jar 内。我被卡住了，不确定为什么我会收到运行时错误。

Caused by: java.lang.IllegalArgumentException: Not an managed type: class com...MyApplicationJobDTO

带有注释的类

@Component
@Entity
public class MyApplicationJobDTO implements Serializable {

我的运行命令

mvn clean package && java -jar target/MyApp-1.0.0.BUILD-SNAPSHOT.jar 

我的主课

@EnableJpaRepositories
@ComponentScan
@EntityScan
@Configuration
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {

        ApplicationContext context = 
                new ClassPathXmlApplicationContext("file:src/main/java/com/myapp/beans.xml");

        SpringApplication.run(Application.class, args);
    }
}

Beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd">

</beans>

错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyApplicationJobController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myapp.xx.yy.models.MyApplicationJobDAO com.myapp.xx.yy.web.MyApplicationJobController.MyApplicationJobDAO; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyApplicationJobDAO': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class com.myapp.aa.bb.myapptest.commons.dto.MyApplicationJobDTO
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1186)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:109)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
    at com.myapp.xx.yy.Application.main(Application.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myapp.xx.yy.models.MyApplicationJobDAO com.myapp.xx.yy.web.MyApplicationJobController.MyApplicationJobDAO; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyApplicationJobDAO': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class com.myapp.aa.bb.myapptest.commons.dto.MyApplicationJobDTO
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:509)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    ... 22 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyApplicationJobDAO': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class com.myapp.aa.bb.myapptest.commons.dto.MyApplicationJobDTO
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1554)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1021)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:964)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:481)
    ... 24 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not an managed type: class com.myapp.aa.bb.myapptest.commons.dto.MyApplicationJobDTO
    at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:219)
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:68)
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getMetadata(JpaEntityInformationSupport.java:65)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:149)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:88)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:68)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:158)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:224)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:210)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1613)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1550)

编辑如果我在我的外部 jar 中手动添加需要在我的 spring 项目中使用的所有类，它就可以工作。我仍然无法从外部 jar 加载类

Answer 1

我在这里给出了相同的答案：https : //stackoverflow.com/a/41145229/372838但这个问题更清楚地说明了问题仅在将 spring boot 应用程序作为 JAR 运行时才会发生

在我的项目中，我们遇到了类似的问题。当与运行mvn spring-boot:start的@EntityScan工作正常，可以找到所有实体，包括那些在库中。当我们使用java -jar应用程序运行 springboot 应用程序时，找不到通过 maven 依赖项引用的实体。当 springboot 应用程序作为 jar 运行时，类加载似乎有所不同。

您可以指示 spring-boot “解包”包含无法找到的实体的 JAR 依赖项。您可以将以下部分添加到您的pom.xml:

<project>
  ...

  <build>
      <plugins>
          <plugin>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-maven-plugin</artifactId>
              <configuration>
                  <requiresUnpack>
                      <dependency>
                          <groupId>org.example.pkg.commons</groupId>
                          <artifactId>domain-jar</artifactId>
                      </dependency>
                  </requiresUnpack>
              </configuration>
          </plugin>
      </plugins>
  </build>

</project>

Answer 2

您的应用程序包可能与 DTO 类的包不同，因此 Spring 无法找到它。你可以做

@ComponentScan("com.myapp.xx.yy.models")