Maven tomcat7.0的Filter启动失败can not be cast to javax.servlet.Filter问题的解决方法

本文链接：https://blog.youkuaiyun.com/qq_15244839/article/details/121111474

本文介绍了在使用Idea配合Maven部署Tomcat7.0时遇到的ClassCastException异常，并提供了详细的解决方案，通过调整依赖配置来解决Myfilter无法转换为javax.servlet.Filter的问题。

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严重: Exception starting filter Myfilter
java.lang.ClassCastException: cn.huoxinwl.studyDemo.filter.Myfilter cannot be cast to javax.servlet.Filter
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4775)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5452)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

Nov 02, 2021 10:58:49 PM org.apache.catalina.core.StandardContext startInternal
严重: Error filterStart

我的是idea用maven的tomcat7.0
解决方法如下

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
</dependency>

在这两个依赖中加<scope>标签！！！！！