问题描述
我使用tomcat 6，spring 2.5.6和maven创建了一个简单的webapp.
I create a simple webapp using tomcat 6, spring 2.5.6 and maven.
问题是当我启动tomcat时，出现以下错误:
The problem is when I boot up tomcat, I am getting the following errors:
SEVERE: StandardWrapper.Throwable
java.lang.NoClassDefFoundError: org/springframework/ui/ModelMap
...
Caused by: java.lang.ClassNotFoundException: org.springframework.ui.ModelMap
ModelMap类确实存在于spring-2.5.6.jar和spring-context-2.5.6.jar中，我也有一些其他的Spring jar.所有这些都正确地部署到了tomcat，当我检查应用程序WEB-INF(部署到tomcat)时，我在那里找到了所有的jars！
The ModelMap class does exist in spring-2.5.6.jar and spring-context-2.5.6.jar, I also have some other spring jars. All of them are being deployed to tomcat correctly, when I check the application WEB-INF (deployed to tomcat) I found all those jars there!
我只有一个具有@RequestMapping("/home.htm") showForm(ModelMap model)方法的@Controller.我的applicationContext很简单:
I have only one @Controller that has a @RequestMapping("/home.htm") showForm(ModelMap model) method.My applicationContext is quite simple:
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.directwebremoting.org/schema/spring-dwr
http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd"
default-autowire="byName">
<context:component-scan base-package="org.myapp"/>
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/WEB-INF/view/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
推荐答案
spring-2.5.6.jar是包含所有Spring框架的JAR.如果使用该JAR，则不应使用任何其他JAR，例如spring-context-2.5.6.jar.如果您要挑选所需的Spring位数，可以使用这些较小的JAR.
spring-2.5.6.jar is the JAR that contains all of the spring framework. If you use that JAR, you should not use any of the other JARs like spring-context-2.5.6.jar. These smaller JARs are there if you want to pick ands choose the bits of Spring that you need.
在JAR之间的类的重复副本之间，类加载器可能会感到困惑.取出除spring-2.5.6.jar之外的所有Spring JAR，看看是否有区别.
It's possible that the classloader is getting confused between the duplicate copies of the classes between the JARs. Take out all of the Spring JARs except for spring-2.5.6.jar, and see if that makes a difference.
这篇关于java.lang.ClassNotFoundException:org.springframework.ui.ModelMap的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！