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spring框架常見的10個問題

一、找不到配置檔案的異常
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解釋:這個的意思是說,沒有找配置檔案為controller的xml,修改一下配置檔名字即可。 <init-param>  <param-name>contextConfigLocation</param-name>  <param-value>classpath:com/herman/ss/config/testAjax.xml</param-value> </init-param> 二、在xml中配置的名稱空間找不到對應的Schema的異常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,因為schema中不存在util命名 三、找不到jackson.jar的異常StandardWrapper.Throwable
java.lang.NoClassDefFoundError: org/codehaus/jackson/JsonProcessingException
缺少jackson的jar包,匯入jackson-all-1.9.5.jar即可
四、bean不是唯一的異常 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)這個異常是說,一個類配置了多個bean之後,我們還在使用ctx.getBean(Person.class);方法,即根據bean的類對映去獲取bean物件。這個時候返回的bean物件不是唯一的,有多個bean物件。解決方法,就是根據bean的id去獲取bean物件。 五、缺少日誌jar包 java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactoryCaused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory這個問題是說,專案中缺少spring依賴的jar包檔案。解決方案:加入commons-logging-1.1.3.jar即可。
六、找不到bean異常 org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined這個問題是說,專案中找不到name為filter2的bean。說白了就是在applicationContext.xml中找不到id為filter2的bean,配置一下即可。六、缺少spring-webmvc-4.0.6.RELEASE.jar包 嚴重: Error loading WebappClassLoader  context: /Struts_Spring_Project  delegate: false  repositories:    /WEB-INF/classes/----------> Parent Classloader:
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org.springframework.web.servlet.DispatcherServletjava.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
解決方案:在專案中加入spring的mvc架包即可。如我的spring版本為4.0.6的,那麼就把spring-webmvc-4.0.6.RELEASE.jar新增進去即可。
七、缺少spring-aop-4.0.6.RELEASE.jar包 java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource
java.lang.ClassNotFoundException: org.springframework.aop.TargetSource解決方案:在專案中加入spring的aop架包即可。如我的spring版本為4.0.6的,那麼就把spring-aop-4.0.6.RELEASE.jar新增進去即可。 八、缺少spring-expression-4.0.6.RELEASE.jar包 java.lang.NoClassDefFoundError: org/springframework/expression/ExpressionParser
java.lang.ClassNotFoundException: org.springframework.expression.ExpressionParser
解決方案:在專案中加入spring的expression架包即可。如我的spring版本為4.0.6的,那麼就把spring-expression-4.0.6.RELEASE.jar新增進去即可。
九、bean的名字name或者id或者別名alias已經存在 org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Bean name 'a' is already used in this <beans> element
解決方法:把重複的名字改個名字即可。
十、bean的自動載入找不到相對應的bean問題
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)}解決方法:在配置檔案中的<beans>根節點下加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