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>4.0.0</modelVersion>    <groupId>com</groupId>    <artifactId>reeco</artifactId>    <packaging>war</packaging>    <version>1.0-SNAPSHOT</version>    <name>reeco Maven Webapp</name>    <url>http://maven.apache.org</url>    <repositories>        <repository>            <id>java.servlet.api</id>            <name>Repository hosting the java servlet api artifacts</name>            <url>http://repo1.maven.org/maven2/javax/servlet/javax.servlet-api/3.0.1/</url>            <releases>                <enabled>true</enabled>            </releases>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories>    <properties>        <junit-version>4.12</junit-version>        <spring-version>4.3.2.RELEASE</spring-version>        <mybatis-version>3.4.1</mybatis-version>        <mybatis-spring-version>1.3.0</mybatis-spring-version>        <druid-version>1.0.24</druid-version>        <fastjson-version>1.2.16</fastjson-version>        <mysql-connection-version>5.1.6</mysql-connection-version>        <mybatis-generator-version>1.3.2</mybatis-generator-version>        <pagehelper-version>4.0.1</pagehelper-version>        <slf4j-version>1.7.12</slf4j-version>        <log4j-version>1.2.17</log4j-version>        <jstl-version>1.2</jstl-version>        <taglibs-version>1.1.2</taglibs-version>        <aspectj-version>1.8.5</aspectj-version>        <operation-version>1.0</operation-version>    </properties>    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>${junit-version}</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-tx</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis</artifactId>            <version>${mybatis-version}</version>        </dependency>        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis-spring</artifactId>            <version>${mybatis-spring-version}</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid</artifactId>            <version>${druid-version}</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>${fastjson-version}</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>${mysql-connection-version}</version>            <scope>runtime</scope>        </dependency>        <dependency>            <groupId>com.github.pagehelper</groupId>            <artifactId>pagehelper</artifactId>            <version>${pagehelper-version}</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-api</artifactId>            <version>${slf4j-version}</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-simple</artifactId>            <version>${slf4j-version}</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-log4j12</artifactId>            <version>${slf4j-version}</version>        </dependency>        <dependency>            <groupId>log4j</groupId>            <artifactId>log4j</artifactId>            <version>${log4j-version}</version>        </dependency>        <dependency>            <groupId>jstl</groupId>            <artifactId>jstl</artifactId>            <version>${jstl-version}</version>        </dependency>        <dependency>            <groupId>taglibs</groupId>            <artifactId>standard</artifactId>            <version>${taglibs-version}</version>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>javax.servlet-api</artifactId>            <version>3.0.1</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aop</artifactId>            <version>${spring-version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aspects</artifactId>            <version>${spring-version}</version>        </dependency>        <!--使用AspectJ方式注解需要相应的包-->        <dependency>            <groupId>org.aspectj</groupId>            <artifactId>aspectjrt</artifactId>            <version>${aspectj-version}</version>        </dependency>        <!--使用AspectJ方式注解需要相应的包-->        <dependency>            <groupId>org.aspectj</groupId>            <artifactId>aspectjweaver</artifactId>            <version>${aspectj-version}</version>        </dependency>        <dependency>            <groupId>cglib</groupId>            <artifactId>cglib</artifactId>            <version>2.2</version>        </dependency>        <dependency>            <groupId>aopalliance</groupId>            <artifactId>aopalliance</artifactId>            <version>1.0</version>        </dependency>    </dependencies>    <build>        <finalName>ssm-simple</finalName>        <resources>            <resource>                <directory>src/main/java</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                </includes>                <filtering>false</filtering>            </resource>            <resource>                <directory>src/main/resources</directory>                <excludes>                    <exclude>generator*.*</exclude>                </excludes>            </resource>        </resources>        <plugins>            <plugin>                <groupId>org.mybatis.generator</groupId>                <artifactId>mybatis-generator-maven-plugin</artifactId>                <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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