问题
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();
}
}
}
回答1:
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!!!!
来源：https://stackoverflow.com/questions/28689870/unable-to-scan-components-from-sub-package-spring-jar