无法处理配置类的导入候选
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【中文标题】无法处理配置类的导入候选【英文标题】:Failed to process import candidates for configuration class 【发布时间】:2017-01-15 10:43:09 【问题描述】:我有一个可以在 IntelliJ 中成功运行的 Spring Boot 项目,但是当我打包一个可执行 jar 时,我无法再运行它。这是异常的堆栈跟踪:
18:13:55.254 [main] INFO o.s.c.a.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@b3d7190: startup date [Wed Sep 07 18:13:55 CEST 2016]; root of context hierarchy
18:13:55.403 [main] WARN o.s.c.a.AnnotationConfigApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [el.dorado.App]; nested exception is java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
18:13:55.414 [main] ERROR o.s.boot.SpringApplication - Application startup failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [el.dorado.App]; nested exception is java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:489)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:191)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:321)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:243)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:273)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:98)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:681)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:523)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174)
at dz.lab.jpmtask.App.main(App.java:33)
Caused by: java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
at org.springframework.util.Assert.notEmpty(Assert.java:276)
at org.springframework.boot.autoconfigure.EnableAutoConfigurationImportSelector.getCandidateConfigurations(EnableAutoConfigurationImportSelector.java:145)
at org.springframework.boot.autoconfigure.EnableAutoConfigurationImportSelector.selectImports(EnableAutoConfigurationImportSelector.java:84)
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:481)
... 13 common frames omitted
我的配置是这样的:
@Configuration
@EnableAutoConfiguration
public class AppConfig
... some beans
我已经在项目资源文件夹下添加了META-INF/spring.factories
,如43.2 Locating auto-configuration candidates 中所述,如下但这并没有解决问题:
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
el.dorado.AppConfig
这里是项目pom.xml
:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>el.dorado</groupId>
<artifactId>ElDorado</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>ElDorado</name>
<url>http://maven.apache.org</url>
<properties>
<junit.version>4.12</junit.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>$junit.version</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>el.dorado.App</mainClass>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<!--<version>0.7.8-SNAPSHOT</version>-->
<executions>
<execution>
<id>jacoco-initialize</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-site</id>
<phase>verify</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
【问题讨论】:
您的 入口点 配置类中需要@EnableAutoConfiguration
,以便 Boot 首先扫描此 AppConfig
。
可以分享一下SpringBootApplication类和pom.xml吗
这是一个奇怪的设置。一方面,您不应该将@EnableAutoConfiguration
放在自动配置类中。请查看您引用的文档。其次,您似乎正在尝试在类路径上没有spring-boot-autoconfigure
的情况下运行您的应用程序。没有找到spring.factories
,因此您的构建没有正确打包它。请分享一个重现问题的项目。
@StephaneNicoll 我想我必须在 spring-boot 某处添加@EnableAutoConfiguration
以配置其他bean(例如JPA)。我已经用项目pom.xml
更新了这个问题。另外,当我使用jar tf jar-file
检查生成的jar 时,我实际上看到META-INF/spring.factories
存在,所以我猜构建已正确打包!
我不知道您要做什么,但看起来您根本不需要自动配置。你为什么要创建META-INF/spring.factories
?
【参考方案1】:
我只是想通了,我应该改用Spring Boot maven plugin。现在我的pom.xml
的构建部分看起来像:
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<mainClass>dz.lab.jpmtask.App</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<!--<version>0.7.8-SNAPSHOT</version>-->
<executions>
<execution>
<id>jacoco-initialize</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-site</id>
<phase>verify</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
我使用mvn clean package
构建项目,然后使用java -jar target/myproject.jar
,它就像一个魅力。
【讨论】:
【参考方案2】:我认为您忘记在 AppConfig 中使用 Annotation。
在AppConfig
类中添加以下三个注解:
@Configuration
@EnableWebMvc
@ComponentScan("Scan_Package_Name")
public class AppConfig
... some beans
【讨论】:
【参考方案3】:我也买了
未能处理配置类的导入候选 [...];嵌套异常是 java.lang.IllegalStateException: Unable to read meta-data for class ...
由于我的 spring.factories
文件中的拼写错误而导致错误。在这种情况下,根异常是
类路径资源 [...] 无法打开,因为它不存在。
这是一个重要的检查点,因为它无法在编译时进行验证。
【讨论】:
【参考方案4】:我从
mvn clean compile assembly:single
到
mvn clean package
并且错误消失了。
【讨论】:
【参考方案5】:我是这样解决的:
-
删除
spring-boot-maven-plugin
在shade插件中配置spring transformers请参考spring parent pom
【讨论】:
【参考方案6】:遇到了同样的问题。如果你也在使用 tomcat,那么清理它对我来说就可以了。
【讨论】:
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