org.apache.catalina.LifecycleException: Failed to start component

最新推荐文章于 2021-04-05 00:54:59 发布

Eiffel_Wu

最新推荐文章于 2021-04-05 00:54:59 发布

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分类专栏：异常文章标签： SpringMVC Servlet Tomcat 字节流

本文链接：https://blog.youkuaiyun.com/Eiffel_Wu/article/details/93471523

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博客主要讲述SpringMVC页面响应字节流图片时出现报错的问题。经分析，异常原因是添加的servlet依赖与maven里tomcat插件自带的servlet冲突。解决方法是在servlet依赖中加入scope标签，并将其值设为provide。

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SpringMVC页面响应字节流图片时出报错

错误代码

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.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/servlet/ServletContext"
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1191)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1669)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:162)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5423)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

异常原因：添加的servlet依赖与maven里面的tomcat插件自带的servlet冲突

方法需要servlet依赖的位置

 @RequestMapping("/test4")
    public void test4(HttpServletResponse response){
        try {
            FileInputStream is = new FileInputStream("E:/景甜.jpg");
            ServletOutputStream os = response.getOutputStream();
            IOUtils.copy(is, os);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

servlet依赖

<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>

解决方法：servlet依赖中加入scope标签，并设置值为provide

<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>