Spring种常见异常解决方法

一、找不到配置文件的异常

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org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML

document from class path resource [com/herman/ss/controller]; nested exception is java.io.FileNotFoundException:

class path resource [com/herman/ss/controller] cannot be opened because it does not exist

解释：这个的意思是说，没有找配置文件为controller的xml，修改一下配置文件名字即可。

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<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:com/herman/ss/config/testAjax.xml</param-value>

</init-param>

二、在xml中配置的命名空间找不到对应的Schema的异常

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nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict,

but no declaration can be found for element 'util:list'.

xmlns:util="http://www.springframework.org/schema/util" 去掉，因为schema中不存在util命名

三、找不到jackson.jar的异常

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StandardWrapper.Throwable

java.lang.NoClassDefFoundError: org/codehaus/jackson/JsonProcessingException

缺少jackson的jar包，导入jackson-all-1.9.5.jar即可

四、bean不是唯一的异常

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org.springframework.beans.factory.NoUniqueBeanDefinitionException:

No qualifying bean of type [com.herman.ss.pojo.Person] is defined:

expected single matching bean but found 7: person0,person1,person2,person3,person4,person5,person6

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:313)

at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:985)

at com.herman.ss.test.Test0.test1(Test0.java:35)

at com.herman.ss.test.Test0.main(Test0.java:111)

这个异常是说，一个类配置了多个bean之后，我们还在使用ctx.getBean(Person.class);方法，即根据bean的类映射去获取bean对象。这个时候返回的bean对象不是唯一的，有多个bean对象。解决方法，就是根据bean的id去获取bean对象。

五、缺少日志jar包

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java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory

这个问题是说，项目中缺少spring依赖的jar包文件。解决方案：加入commons-logging-1.1.3.jar即可。

六、找不到bean异常

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org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined

这个问题是说，项目中找不到name为filter2的bean。说白了就是在applicationContext.xml中找不到id为filter2的bean，配置一下即可。

六、缺少spring-webmvc-4.0.6.RELEASE.jar包

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严重: Error loading WebappClassLoader

context: /Struts_Spring_Project

delegate: false

repositories:

/WEB-INF/classes/

----------> Parent Classloader:

org.apache.catalina.loader.StandardClassLoader@b33d0a

org.springframework.web.servlet.DispatcherServlet

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

解决方案：在项目中加入spring的mvc架包即可。如我的spring版本为4.0.6的，那么就把spring-webmvc-4.0.6.RELEASE.jar添加进去即可。

七、缺少spring-aop-4.0.6.RELEASE.jar包

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java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource

java.lang.ClassNotFoundException: org.springframework.aop.TargetSource

解决方案：在项目中加入spring的aop架包即可。如我的spring版本为4.0.6的，那么就把spring-aop-4.0.6.RELEASE.jar添加进去即可。

八、缺少spring-expression-4.0.6.RELEASE.jar包

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java.lang.NoClassDefFoundError: org/springframework/expression/ExpressionParser

java.lang.ClassNotFoundException: org.springframework.expression.ExpressionParser

解决方案：在项目中加入spring的expression架包即可。如我的spring版本为4.0.6的，那么就把spring-expression-4.0.6.RELEASE.jar添加进去即可。

九、bean的名字name或者id或者别名alias已经存在

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org.springframework.beans.factory.parsing.BeanDefinitionParsingException:

Configuration problem: Bean name 'a' is already used in this <beans> element

解决方法：把重复的名字改个名字即可。

十、bean的自动加载找不到相对应的bean问题

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org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.yyc.ym.biz.YycBiz] 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)}

解决方法：在配置文件中的<beans>根节点下加default-autowire="byName" default-lazy-init="true"或者<context:component-scan base-package="com.xxx.dao.*"></context:component-scan>包下面用*匹配