SpringServletContainerInitializer无法强制转换为javax.servlet.ServletContainerInitializer

Question

我试图将基于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addServlet()方法,有些则不提供.

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/*");
    }
}

这似乎相当无可争议.为了得到

container.addServlet()

方法,我把它包括在我的pom中:

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

我试过这个,但是下面的条目中的ServletContext类没有工作(因为它没有提供addServlet()方法):

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

当我尝试使用它时

mvn clean tomcat7:run

我不幸得到了

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框架而另一个来自javax.servlet,但是再一次,该方法并不存在于Spring提供的类中(这令人沮丧,因为这个例子存在于Spring 3.2文档本身中.

我使用的是Spring 3.2.我不使用Eclipse(所有示例都是基于Eclipse的,我在IntelliJ中).这是一个maven项目

我很感激你的帮助.

Answer 1

这里有一个更好的servlet 3.0 api依赖项输入 - https://github.com/SpringSource/greenhouse/tree/servlet3,你也应该将范围标记为provided,否则jar将包含在你的最终战争中会干扰用容器提供的罐子,这在您的情况下似乎正在发生.

Answer 2

我有一个类似的问题没有Spring,mvn tomcat7:run虽然servlet部署到OpenShift就好了,但是没有用.根据Biju Kunjummen的回答,对我来说问题是我正在编译的servlet-api.

破碎:

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>

固定:

<dependency>
    <groupId>org.mortbay.jetty</groupId>
    <artifactId>servlet-api</artifactId>
    <version>3.0.20100224</version>
    <scope>provided</scope>
</dependency>

不是很清楚为什么,但它现在有效.