不同的包下有文件名相同的java类,spring自动注入会报错
2016-06-15 18:47
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今天闲的蛋疼,做了一下spring自动注入的例子:
看看spring自动注入的是否可以区别出不同包下相同名字的java类,答案是不能,spring居然这么渣。
整体结构图如下:
1:首先建立两个同名的java类和接口
com.a包下面有一个IAutoInject接口和实现类AutoInject,同理com.b包下面也有相同的接口和实现类。
同时加上spring声明bean的注解,@component或者@service或者@repository都可以,这里我用@component
代码如下:
Spring配置文件如下:
最后写一个测试类:
最后报错:
看看上面深颜色的报错 ,可以看出
看看spring自动注入的是否可以区别出不同包下相同名字的java类,答案是不能,spring居然这么渣。
整体结构图如下:
1:首先建立两个同名的java类和接口
com.a包下面有一个IAutoInject接口和实现类AutoInject,同理com.b包下面也有相同的接口和实现类。
同时加上spring声明bean的注解,@component或者@service或者@repository都可以,这里我用@component
代码如下:
package com.a; public interface IAutoInject { public void print(); }
package com.a; import org.springframework.stereotype.Component; @Component public class AutoInject implements IAutoInject{ public void print() { // TODO Auto-generated method stub System.out.println("打印a中的方法"); } }
package com.b; public interface IAutoInject { public void print(); }
package com.b; import org.springframework.stereotype.Component; @Component public class AutoInject implements IAutoInject{ public void print() { // TODO Auto-generated method stub System.out.println("打印b中的方法"); } }
Spring配置文件如下:
<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <!-- 自动扫描的包名 --> <context:component-scan base-package="com"></context:component-scan> <!-- 默认的注解映射的支持 --> <mvc:annotation-driven /> </beans>
最后写一个测试类:
package com.test; import javax.annotation.Resource; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import org.springframework.test.context.transaction.TransactionConfiguration; import org.springframework.transaction.annotation.Transactional; import com.a.IAutoInject; //@Transactional //@TransactionConfiguration(transactionManager = "txManager", defaultRollback = true) @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "classpath:applicationContext.xml" }) public class MainTest { @Resource private IAutoInject autoInjecta; @Resource private com.b.IAutoInject autoInjectb; @Test public void test(){ autoInjecta.print(); autoInjectb.print(); } }
最后报错:
<span style="background-color: rgb(102, 102, 102);">java.lang.IllegalStateException: Failed to load ApplicationContext</span> at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:103) at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:321) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) <span style="background-color: rgb(102, 102, 102);">Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [applicationContext.xml]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]</span> at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:413) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:335) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243) at org.springframework.test.context.support.AbstractGenericContextLoader.loadBeanDefinitions(AbstractGenericContextLoader.java:233) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:117) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:102) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:246) at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:69) at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:95) ... 25 more
看看上面深颜色的报错 ,可以看出
Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]
[com.b.AutoInject]
与
[com.a.AutoInject]
冲突了!
老老实实改成:
@Component(value="a")
@Component(value="b")
使用的时候改成:
public class MainTest { @Resource(name="a") private IAutoInject autoInjecta; @Resource(name="b") private com.b.IAutoInject autoInjectb; @Test public void test(){ autoInjecta.print(); autoInjectb.print(); } }
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