java.io.IOException: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServlet

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最新推荐文章于 2023-01-31 22:29:23 发布

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当遇到java.io.IOException伴随java.lang.ClassCastException，错误信息提到不能转换org.springframework.web.SpringServlet时，这通常由于不正确的依赖引入引起。解决方案是在项目中添加一个特定的依赖，其scope设置为provided，以避免此类异常的发生。

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java.io.IOException: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServlet
这个异常，一般是项目里引入了如下依赖：

 <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
</dependency>

问题提示：

java.io.IOException: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServletContainerInitializer to javax.servlet.ServletContainerInitializer
	at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:206)
	at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:158)
	at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1579)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1280)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:888)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5522)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServletContainerInitializer to javax.servlet.ServletContainerInitializer
	at java.lang.Class.cast(Class.java:3186)
	at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:198)
	... 15 more

解决办法，对应的项目里添加如下依赖：

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>