不同的包下有文件名相同的java类，spring自动注入会报错

最新推荐文章于 2023-04-16 13:52:25 发布

mkl34367803

最新推荐文章于 2023-04-16 13:52:25 发布

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分类专栏： java-spring 文章标签：自动注入 spring

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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：

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();
	}
}