SEVERE:为servlet分配异常<myservlet-name> java.lang.ClassNotFoundException:<myservlet> exception

Question

当我使用以下内容时web.xml,我的项目运行正常,我可以通过index.jsp页面看到"Hello World".我使用的是Netbeans 7.4和Apache tomcat 6.0.41

<?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">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
 </web-app>

但是,当我创建自己的servlet并使用以下时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">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>

 <servlet>
    <servlet-name>TEST_Authenticate</servlet-name>
    <servlet-class>restapi.TEST_Authenticate</servlet-class>
</servlet>  
<servlet-mapping>
    <servlet-name>TEST_Authenticate</servlet-name>
    <url-pattern>/TEST_Authenticate</url-pattern>
</servlet-mapping>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>


    <scope>provided</scope>
</dependency>

我最终在Apache Tomcat日志中收到以下错误:

Jul 24, 2014 9:36:14 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet TEST_Authenticate
java.lang.ClassNotFoundException: TEST_Authenticate
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:744)

我检查了以下帖子,但仍然收到错误.

项目结构:

Answer 1

首先删除

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

从web.xml并把它放在你的pom.xml,如果它是一个Maven项目.

其次,ClassNotFoundException当在指定位置找不到类时抛出.在你的情况下,就像你一样

<servlet-class>restapi.TEST_Authenticate</servlet-class>

所以,我假设您有一个名字包,restapi并且您拥有该课程TEST_Authenticate.

所以,如果它是一个Maven项目你应该拥有scr/main/java/yourpackagename/yourClass,如果它是一个简单的web项目,那么应该是这样的src/yourpackagename/yourClass.