java.lang.ClassCastException: org.springframework.web.filter.CharacterEncodingFilter cannot be cast to javax.servlet.Filter at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)

原因：可能是包冲突了 One of your dependencies are including a servlet-api into your war file which causes that behavior. Using mvn dependency:tree, you can find out which of your dependency is that. After that you need to exclude the servlet-api as follows:

<dependency> 解决办法：

<dependency>  <groupId>[VALUE]</groupId>  <artifactId>[VALUE]</artifactId>  <version>[VALUE]</version>  <exclusions>    <exclusion>      <groupId>javax.servlet</groupId>      <artifactId>servlet-api</artifactId>    </exclusion>  </exclusions></dependency>

例子：

<!-- 去除自带servlet依赖避免冲突-->		<dependency>        <groupId>javax.servlet</groupId>        <artifactId>javax.servlet-api</artifactId>        <version>3.1.0</version>        <scope>provided</scope>        <exclusions>            <exclusion>                <groupId>javax.servlet</groupId>                <artifactId>servlet-api</artifactId>            </exclusion>        </exclusions>    </dependency>

cannot be cast to javax.servletFilter