启动tomcat时ClassNotFoundException

Question

我正在尝试制作REST Web服务.

我的项目看起来像:

追溯是:

8 déc. 2011 18:31:36 org.apache.catalina.core.AprLifecycleListener init
INFO: The Apache Tomcat Native library which allows optimal performance in production     environments was not found on the java.library.path: C:\Program Files\MyEclipse\Common\binary\com.sun.java.jdk.win32.x86_1.6.0.013\bin;C:\Program Files\MyEclipse\Common\plugins\com.genuitec.eclipse.easie.tomcat.myeclipse_9.0.0.me201109141806\tomcat\bin
8 déc. 2011 18:31:36 org.apache.coyote.http11.Http11Protocol init
INFO: Initialisation de Coyote HTTP/1.1 sur http-8080
8 déc. 2011 18:31:36 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 394 ms
8 déc. 2011 18:31:37 org.apache.catalina.core.StandardService start
INFO: Démarrage du service Catalina
8 déc. 2011 18:31:37 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.13
8 déc. 2011 18:31:37 org.apache.catalina.startup.HostConfig deployWAR
INFO: Déploiement de l'archive Test-0.0.1-SNAPSHOT.war de l'application web
8 déc. 2011 18:31:37 org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Documents and Settings\Naya\Workspaces\MyEclipse 10\.metadata\.me_tcat\webapps\Test-0.0.1-SNAPSHOT\WEB-INF\lib\javax.servlet-3.0.1.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
8 déc. 2011 18:31:37 org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Documents and Settings\Naya\Workspaces\MyEclipse 10\.metadata\.me_tcat\webapps\Test-0.0.1-SNAPSHOT\WEB-INF\lib\servlet-api-2.5.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
8 déc. 2011 18:31:38 org.apache.catalina.core.ApplicationContext log
INFO: La servlet Test JAX-RS REST Servlet est marqué comme indisponible
8 déc. 2011 18:31:38 org.apache.catalina.core.ApplicationContext log
GRAVE: Error loading WebappClassLoader
delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@19e8329
 com.sun.jersey.spi.container.servlet.ServletContainer
java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1083)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4042)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4348)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:825)
    at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:714)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:516)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

我的web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name> 
  <servlet>
    <display-name>Test JAX-RS REST Servlet</display-name>
    <servlet-name>Test JAX-RS REST Servlet</servlet-name>
    <servlet-class>
        com.sun.jersey.spi.container.servlet.ServletContainer
    </servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Test JAX-RS REST Servlet</servlet-name>
    <url-pattern>/services/*</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

谁能帮我 ？

Answer 1

解:

只在pom.xml中添加依赖项:

 <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-servlet</artifactId>
      <version>1.13</version>
 </dependency>

现在你的应用程序将有com.sun.jersey.spi.container.servlet.ServletContainer类

ps:记得检查库是否被发送到tomcat部署.

去检查:

右键单击项目 - > Properties - > Deployment Assembler,确保Source选项卡包含Maven Dependecies.

除此以外:

单击按钮添加 - > Java构建路径 - > Maven依赖 - >完成.

无论何时运行应用程序,都会在部署中导入所有库.

ps:在更新Maven项目的地方,您必须重新制作这些步骤.

Answer 2

我遇到了同样的问题.我使用的是版本1.12.

我com.sun.jersey.spi.container.servlet.ServletContainer在其他一些论坛中建议的"jersey-server-1.12.jar"或"jersey-core-1.12.jar"中找不到该类.

当您将它添加到构建路径时,您可以在Eclipse中轻松地检查它,并注意到您在上述jar文件中没有该类.

我四处搜索,发现以下内容:

看起来这个类com.sun.jersey.spi.container.servlet.ServletContainer在不同的jar文件中("jersey-servlet-1.12.jar").

我没有找到任何关于此的文档.但是,在我的WEB-INF/lib中使用此文件解决了此问题.

希望这可以帮助.

Answer 3

如果您正在使用Maven,那么可能的问题可能是您的jar没有部署到您的Tomcat.因此,您在Java构建路径(项目>属性>构建路径)中拥有Maven依赖项,但是当从Eclipse Maven Dependencies在Tomcat上运行项目时,不会将其部署到TOmcat.要解决此问题,您必须:右键单击>属性,然后选择"部署程序集".并添加Java Build Path Entries.这样你就可以告诉WTP插件(在Eclipse中运行Tomcat的插件),它也应该复制Maven的jar

Answer 4

在Jersey 2.0中,servlet容器实现发生了变化.您需要使用org.glassfish.jersey.servlet.ServletContainer而不是旧的com.sun.jersey.spi.container.servlet.ServletContainer

上课是在

    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
        <version>2.0-m11</version>
    </dependency>

您可以使用以下命令创建骨架项目:

mvn archetype:generate -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeGroupId=org.glassfish.jersey.archetypes -
DinteractiveMode=false -DgroupId=com.example -DartifactId=simple-service -Dpackage=com.example -DarchetypeVersion=2.0-m11