无法从子包中扫描组件 - Spring Jar [英] Unable to scan components from sub-package - Spring Jar
本文介绍了无法从子包中扫描组件 - Spring Jar的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
@Component 不工作或组件扫描基础包或其他？ 这里是Spring-context.xml：
<？xml version =1.0encoding = UTF-8\" >？;
< beans xmlns =http://www.springframework.org/schema/beans
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instancexmlns ：p =http://www.springframework.org/schema/p
xmlns：context =http://www.springframework.org/schema/context
xsi：schemaLocation = http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/上下文
http://www.springframework.org/schema/context/spring-context-3.2.xsd\">
< context：property-placeholder location =classpath *：/ connection.properties，classpath *：/ log4j.properties/>
< import resource =classpath *：/ sm-service-context.xml/>
< context：annotation-config />
< context：component-scan base-package =com.hca.sm.migration/>
< bean class =com.hca.sm.migration.MigrationController/>
< / beans>
更新：错误堆栈跟踪：
org.springframework.beans.factory.BeanCreationException：创建名为com.hca.sm.migration.MigrationController＃0的bean时出错：自动连线依赖关系的注入失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动连线字段：protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到依赖关系类型为[com.hca.sm.migration.soap.util.SOAPMessageUtil]的符合条件的bean：至少有一个Bean被认定为该依赖关系的自动连线候选。依赖关系注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}
在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:292）$ b $在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:537）
在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:475）
在org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:302）
在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:228）
在org.springframework.beans.factory .support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:298）
在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:193）
在org.springframework.beans.factory .support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:703）
在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:760）
在org.springframework.context.support.AbstractApplicationContext .refresh（AbstractApplicationContext.java:482）
在org.springframework.context.support.ClassPathXmlApplicationContext。< init>（ClassPathXmlApplicationContext.java:139）
在org.springframework.context.support.ClassPathXmlApplicationContext。 < init>（ClassPathXmlApplicationContext.java:83）
at com.hca.sm.migration.SMMigrationApp.main（SMMigrationApp.java:39）
at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method ）
at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）
at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
在java.lang.reflect。 Method.invoke（Method.java:606）
在org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main（JarRsrcLoader.java:58）
导致：org.springframework.beans.factory。 BeanCreationException：无法自动连线字段：protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到依赖关系类型为[com.hca.sm.migration.soap.util.SOAPMessageUtil]的符合条件的bean：至少有一个Bean被认定为该依赖关系的自动连线候选。依赖关系注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}
在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:508）
在org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:87）
在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:289）
... 18更多
导致：org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到依赖关系类型[com.hca.sm.migration.soap.util.SOAPMessageUtil]的符合条件的bean至少有1个bean符合这种依赖关系的自动连线候选。依赖关系注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}
在org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException（DefaultListableBeanFactory.java:1103）
org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:858）
在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:480）
...另外
错误[main]（SMMigrationApp.java:17） - org .springframework.beans.factory.BeanCreationException：创建名为'com.hca.sm.migration.MigrationController＃0'的bean时出错：注入自动连线依赖关系失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动连线字段：protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到依赖关系类型为[com.hca.sm.migration.soap.util.SOAPMessageUtil]的符合条件的bean：至少有一个Bean被认定为该依赖关系的自动连线候选。依赖关系注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}
MigrationController.java：
package com.hca.sm.migration;
import java.util.List;
import javax.annotation.PostConstruct;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/ *其他导入* /
@Component
public class MigrationController extends AbstractEntityUtil {
private static final Logger logger = Logger.getLogger（MigrationController。 class.getName（））;
@Autowired
protected SOAPMessageUtil soapMessageUtil;
@Autowired
protected SOAPGroupUtil soapGroupUtil;
@Autowired
protected SOAPMessageThreadUtil soapMessageThreadUtil;
@Autowired
protected RestServiceUtil restServiceUtil;
private SecureMail connectionPort = null;
private GroupList groupList = null;
@PostConstruct
public void init（）{
connectionPort = soapConnectionUtil.getSOAPConnection（）;
}
public void migrateOldSmToNew（String clientId，String dryRun）{
groupList = soapGroupUtil.getListOfGroupsByClientId（clientId，connectionPort）;
/ *其他逻辑* /
}
}
我的主要类从我所在的控制器：
package com.hca.sm.migration ;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
@Component
public final class SMMigrationApp {
public static void main（String [] args）{
String clientId =dc = ihcs， DC = COM;
String dryRun =true;
try {
ApplicationContext smApplicationContext = new ClassPathXmlApplicationContext（classpath *：/ SM-MigrationApplicationContext.xml）;
// migration
MigrationController migrationController =（MigrationController）smApplicationContext.getBean（MigrationController.class.getName（））; //这里是错误
migrationController.migrateOldSmToNew（clientId，dryRun）;
} catch（Exception e）{
e.printStackTrace（）;
}
}
}
解决方案
OKAY！所以经过大量的挖掘，我选择了另一种方法来将我的应用程序打包成可运行的jar，它的接缝为我工作。但是，我仍然不明白为什么在这种情况下，组件扫描基础包不起作用。我认为它必须使用maven组装jar和 .classpath 在 menifest.mf 之内做某事。所以我建议任何人有这样的问题使用以下插件：
< plugin>
< groupId> org.springframework.boot< / groupId>
< artifactId> spring-boot-maven-plugin< / artifactId>
< version> 1.2.2.RELEASE< / version>
<执行>
< execution>
< goals>
< goal>重新包装< / goal>
< / goals>
< / execution>
< / executions>
< / plugin>
这是创建独立的可运行的jar的最简单的方法，包括所有依赖项。
要在控制台编译和运行maven命令：
mvn clean package
要在控制台运行jar：
java -jar jarName.jar
希望这有助于像我一样的人！ !!!
I'm developing a spring command line app which uses dependency of external jars. When I run the app from eclipse it works perfectly, but when I export it as runnable jar it fails to autowire the dependecies from the sub-package. However if I write each bean definition in spring-context, then it works. What is the problem with it? Is @Component not working or component-scan base package or something else?
Here is Spring-context.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<context:property-placeholder location="classpath*:/connection.properties, classpath*:/log4j.properties" />
<import resource="classpath*:/sm-service-context.xml" />
<context:annotation-config />
<context:component-scan base-package="com.hca.sm.migration" />
<bean class="com.hca.sm.migration.MigrationController" />
</beans>
Update: ERROR Stacktrace:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.hca.sm.migration.MigrationController#0': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.hca.sm.migration.soap.util.SOAPMessageUtil] 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.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
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:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.hca.sm.migration.SMMigrationApp.main(SMMigrationApp.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.hca.sm.migration.soap.util.SOAPMessageUtil] 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:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 18 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.hca.sm.migration.soap.util.SOAPMessageUtil] 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.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1103)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:963)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 20 more
ERROR [main] (SMMigrationApp.java:17) - org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.hca.sm.migration.MigrationController#0': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected com.hca.sm.migration.soap.util.SOAPMessageUtil com.hca.sm.migration.MigrationController.soapMessageUtil; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.hca.sm.migration.soap.util.SOAPMessageUtil] 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)}
MigrationController.java:
package com.hca.sm.migration;
import java.util.List;
import javax.annotation.PostConstruct;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/* other imports */
@Component
public class MigrationController extends AbstractEntityUtil {
private static final Logger logger = Logger.getLogger(MigrationController.class.getName());
@Autowired
protected SOAPMessageUtil soapMessageUtil;
@Autowired
protected SOAPGroupUtil soapGroupUtil;
@Autowired
protected SOAPMessageThreadUtil soapMessageThreadUtil;
@Autowired
protected RestServiceUtil restServiceUtil;
private SecureMail connectionPort = null;
private GroupList groupList = null;
@PostConstruct
public void init() {
connectionPort = soapConnectionUtil.getSOAPConnection();
}
public void migrateOldSmToNew(String clientId, String dryRun) {
groupList = soapGroupUtil.getListOfGroupsByClientId(clientId, connectionPort) ;
/* other logic*/
}
}
And my main class from where I call the controller:
package com.hca.sm.migration;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
@Component
public final class SMMigrationApp {
public static void main(String[] args) {
String clientId = "dc=ihcs,dc=com";
String dryRun = "true";
try {
ApplicationContext smApplicationContext = new ClassPathXmlApplicationContext("classpath*:/SM-MigrationApplicationContext.xml");
// migration
MigrationController migrationController = (MigrationController) smApplicationContext.getBean(MigrationController.class.getName()); //here is error
migrationController.migrateOldSmToNew(clientId, dryRun);
} catch (Exception e) {
e.printStackTrace();
}
}
}
解决方案
OKAY! So after much of digging I chose another approach to pack my application as runnable jar and it seams to work for me. However I still don't get why the component-scan-base package was is not working in this case. I assume it has to do something with the way maven assemble the jar and .classpath inside menifest.mf. So I suggest if anyone is having such problem use following plugin:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.2.2.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
This is the most simple way to create standalone runnable jar which includes all the dependencies.
To compile and package run maven command at console:
mvn clean package
To run the jar at console :
java -jar jarName.jar
Hope this helps someone like me!!!!
这篇关于无法从子包中扫描组件 - Spring Jar的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
