搭建ssm的踩坑之路（一）EhcacheCache、LoggingEhcache启动不起来_could not initialize class net.sf.ehcache.cacheman-优快云博客

本文记录了在Spring+SpringMVC+MyBatis项目中整合Ehcache缓存时遇到的问题及解决方案，包括调整slf4j与logback配置，正确引入mybatis-ehcache和ehcache依赖，刷新Maven仓库并重启应用。

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用惯了springboot感觉对ssm原始的搭配方式有点陌生了，决定动手搭建一次ssm框架，搭建好之后还原了一下，把一些踩坑记录写下来，用作参考。这次搭建使用到框架 spring + springmvc + mybatis + ehcache + druid ，然后用到 ehcache的时候出现了下面的bug见截图：

日志如下：

Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.mybatis.caches.ehcache.EhcacheCache
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:178)
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)
	at org.apache.ibatis.io.Resources.classForName(Resources.java:256)
	at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:113)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.cacheElement(XMLMapperBuilder.java:202)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:114)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)
	at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:464)
	at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:340)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
	... 57 more

解决方案：

1，注意 slf4j-jdk14 的配置需要与 logback 配套

<dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-jdk14</artifactId>
          <version>1.7.25</version>
      </dependency>
      <!--可以使用logback配置-->
      <dependency>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
          <version>1.1.11</version>
      </dependency>

2，注意 ehcache 对应的依赖

<!--mybatis 启用ehcache 二级缓存-->
      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-ehcache</artifactId>
          <version>1.0.0</version>
      </dependency>
      <dependency>
          <groupId>net.sf.ehcache</groupId>
          <artifactId>ehcache</artifactId>
          <version>2.8.3</version>
      </dependency>

刷新maven仓库，重启正常了，问题已解决