无法将SpringServletContainerInitializer强制转换为javax.servlet.ServletContainerInitializer [英] SpringServletContainerInitializer cannot be cast to javax.servlet.ServletContainerInitializer

问题描述

我正在尝试将基于xml的Spring MVC应用程序移动到基于Java配置的应用程序.似乎与maven中可用的各种java.servlet类不匹配.例如，有些提供了addServlet()方法，有些则没有.

I am attempting to move a xml-based Spring MVC app to a Java Configuration based app. There appears to be a mismatch with the various java.servlet classes available in maven. For instance, some provide the addServlet() method and some do not.

这是我的配置类:

public class MyWebAppInitializer implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext container) throws ServletException {

        AnnotationConfigWebApplicationContext rootContext =
                new AnnotationConfigWebApplicationContext();
        rootContext.register(JpaSandboxConf.class);

        ServletRegistration.Dynamic registration = container.addServlet("dispatcher", new DispatcherServlet());
        registration.setLoadOnStartup(1);
        registration.addMapping("/myapp/*");
    }
}

这似乎毫无争议.为了获得

Which seems rather uncontroversial. In order to get the

container.addServlet()

方法，我将其包含在pom中:

method, I included this in my pom:

<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-servlet-api</artifactId>
    <version>7.0.30</version>
</dependency>

我尝试了这个，但是DID下的条目中的ServletContext类不起作用(因为它没有提供addServlet()方法):

I tried this, but the ServletContext class from the entry below DID NOT WORK (in that it didnot provide the addServlet() method):

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>com.springsource.javax.servlet</artifactId>
    <version>2.5.0</version>
    <scope>provided</scope>
</dependency>

当我尝试使用

mvn clean tomcat7:run

我很不高兴

SEVERE: 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$Sync.innerGet(FutureTask.java:252)
    at java.util.concurrent.FutureTask.get(FutureTask.java:111)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1130)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1568)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1558)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    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:722)
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)
    ... 7 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:1543)
    at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1464)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1190)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:825)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:300)
    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:5161)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 7 more

我看到一个类来自Spring框架，另一个来自javax.servlet，但是再次，该方法在Spring提供的类中不存在(令人沮丧，因为该示例存在于Spring 3.2文档本身中)

I see that one class is coming from Spring framework and the other from javax.servlet, but once again, the method does not exist from the Spring provided class (which is frustrating, because this example exists within the Spring 3.2 documentation itself.

我正在使用Spring 3.2.我没有使用Eclipse(所有示例都基于Eclipse，我在IntelliJ中).这是一个maven项目

I am using Spring 3.2. I am NOT using Eclipse (all the examples are Eclipse based, I'm in IntelliJ). This is a maven project

非常感谢您的帮助.

推荐答案

此处提供了pom中更好的servlet 3.0 api依赖项-

A better servlet 3.0 api dependency entry in pom is available here - https://github.com/SpringSource/greenhouse/tree/servlet3, you should also mark the scope as provided, otherwise the jar will be included in your final war which will interfere with the jar provided by the container which is what seems to be happening in your case.

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