org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat]

我就是我 2022-02-14 07:23 215阅读 0赞

报错信息如下：

严重: A child container failed during start
    java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
    	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
    	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
    	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
    	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)
    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    	... 6 more
    Caused by: java.lang.ClassCastException: org.springframework.web.SpringServletContainerInitializer cannot be cast to javax.servlet.ServletContainerInitializer
    	at org.apache.catalina.startup.ContextConfig.getServletContainerInitializer(ContextConfig.java:1670)
    	at org.apache.catalina.startup.ContextConfig.getServletContainerInitializers(ContextConfig.java:1652)
    	at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1562)
    	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270)
    	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
    	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376)
    	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	... 6 more

问题定位：  
servlet-api.jar在dubbo的jar包中有被引用，从而导致冲突报错  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1eGllbGVh_size_16_color_FFFFFF_t_70]

解决方案：  
1.排除dobbo的servlet-api.jar的引用  
2.另外重新引入servlet-api的jar包（此类通用jar包可以抽取至父工程pom文件中）  
如下：

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <exclusions>
            <exclusion>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>

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