IDEA中Maven报错NoClassDefFoundError

这是我走的大概三天的坑，一直搞不清楚原因，今天总算把问题解决了。
首先说问题的源头，是我使用SSM框架写j2ee程序，要使用到AOP，于是就在网上查找了如何使用maven添加AOP相关的jar包，之后配置了pom.xml文件如下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0modelVersion>
    <groupId>comgroupId>
    <artifactId>reecoartifactId>
    <packaging>warpackaging>
    <version>1.0-SNAPSHOTversion>
    <name>reeco Maven Webappname>
    <url>http://maven.apache.orgurl>

    <repositories>
        <repository>
            <id>java.servlet.apiid>
            <name>Repository hosting the java servlet api artifactsname>
            <url>http://repo1.maven.org/maven2/javax/servlet/javax.servlet-api/3.0.1/url>
            <releases>
                <enabled>trueenabled>
            releases>
            <snapshots>
                <enabled>falseenabled>
            snapshots>
        repository>
    repositories>

    <properties>
        <junit-version>4.12junit-version>
        <spring-version>4.3.2.RELEASEspring-version>
        <mybatis-version>3.4.1mybatis-version>
        <mybatis-spring-version>1.3.0mybatis-spring-version>
        <druid-version>1.0.24druid-version>
        <fastjson-version>1.2.16fastjson-version>
        <mysql-connection-version>5.1.6mysql-connection-version>
        <mybatis-generator-version>1.3.2mybatis-generator-version>
        <pagehelper-version>4.0.1pagehelper-version>
        <slf4j-version>1.7.12slf4j-version>
        <log4j-version>1.2.17log4j-version>
        <jstl-version>1.2jstl-version>
        <taglibs-version>1.1.2taglibs-version>
        <aspectj-version>1.8.5aspectj-version>
        <operation-version>1.0operation-version>
    properties>

    <dependencies>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>${junit-version}version>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-coreartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-beansartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-jdbcartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-txartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>${mybatis-version}version>
        dependency>

        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatis-springartifactId>
            <version>${mybatis-spring-version}version>
        dependency>

        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>${druid-version}version>
        dependency>

        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>${fastjson-version}version>
        dependency>

        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>${mysql-connection-version}version>
            <scope>runtimescope>
        dependency>

        <dependency>
            <groupId>com.github.pagehelpergroupId>
            <artifactId>pagehelperartifactId>
            <version>${pagehelper-version}version>
        dependency>

        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>${slf4j-version}version>
        dependency>

        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-simpleartifactId>
            <version>${slf4j-version}version>
        dependency>

        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-log4j12artifactId>
            <version>${slf4j-version}version>
        dependency>

        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>${log4j-version}version>
        dependency>

        <dependency>
            <groupId>jstlgroupId>
            <artifactId>jstlartifactId>
            <version>${jstl-version}version>
        dependency>

        <dependency>
            <groupId>taglibsgroupId>
            <artifactId>standardartifactId>
            <version>${taglibs-version}version>
        dependency>

        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>3.0.1version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-aopartifactId>
            <version>${spring-version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-aspectsartifactId>
            <version>${spring-version}version>
        dependency>

        
        <dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjrtartifactId>
            <version>${aspectj-version}version>
        dependency>
        
        <dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjweaverartifactId>
            <version>${aspectj-version}version>
        dependency>

        <dependency>
            <groupId>cglibgroupId>
            <artifactId>cglibartifactId>
            <version>2.2version>
        dependency>

        <dependency>
            <groupId>aopalliancegroupId>
            <artifactId>aopallianceartifactId>
            <version>1.0version>
        dependency>



    dependencies>
    <build>
        <finalName>ssm-simplefinalName>
        <resources>
            <resource>
                <directory>src/main/javadirectory>
                <includes>
                    <include>**/*.propertiesinclude>
                    <include>**/*.xmlinclude>
                includes>
                <filtering>falsefiltering>
            resource>
            <resource>
                <directory>src/main/resourcesdirectory>
                <excludes>
                    <exclude>generator*.*exclude>
                excludes>
            resource>
        resources>

        <plugins>
            <plugin>
                <groupId>org.mybatis.generatorgroupId>
                <artifactId>mybatis-generator-maven-pluginartifactId>
                <version>${mybatis-generator-version}version>
            plugin>
        plugins>
    build>

project>

其中注释的地方就是我添加AOP相关jar包的位置，然后我在applicationContext.xml文件中配置了AOP检测注解的语句，也就是：

<aop:aspectj-autoproxy/>

配置完之后再IDEA中无报错，然后开始用tomcat部署，redeploy后结果就开始报错，错误为：

Java.lang.ClassNotFoundException:org.aspectj.lang.annotation.Around

错误描述以及解决方法请见此博客
http://blog.csdn.net/u013147600/article/details/48132947

但问题是他的解决方法不是我的问题，因为我已经将jar包引入maven了，而且之后我尝试了更换版本号，将maven代码修改一致等等，包括maven的scope配置项修改，都不好用，这个时候我见到了另一篇博文
http://blog.csdn.net/qqhjqs/article/details/51491516

里面一句话提醒了我

是否被打包—查看tomcat文件下对应项目中的web-INF的lib下有没有对应的jar包，然后在看看pom.xml中是怎样配置的

于是我查看了，默认IDEA是将生成的文件和war包都放在target下面的，如果不确定可以去Project-structure的artifacts查看路径，我的查看结果如下图

也就是虽然在maven里已经导入了，但是打包之后的并没有导入，于是我查看了我的代码和相关配置，又搜索了很多有关的信息，都发现自己并没有问题，这个时候google中又有一篇博客被我看到了

https://www.oschina.net/question/726953_139122

看完之后终于恍然大悟，需要在Project Structure设置中将Maven管理的jar包放到lib目录下，之后才会被打包，这个居然还要自己手动去做，耽误了这么久，图片如下

所以到此为止，基本所有在IDEA中maven可能报错NoClassDefFoundError的解决方案都被我列出来了，希望能有所帮助，除了这个坑又是一条好汉！

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