我想在Eclipse中使用Servlet进行开发,但它说javax.servlet无法解析包.如何将javax.servlet包添加到Eclipse项目中？
我试图创建/运行一个基本的JSP并遇到以下错误.我看到其他人遇到了类似的问题,但是,我还没能找到(或正确实施)手头问题的解决方案.任何帮助,将不胜感激!
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SimpleServletProject]]
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:816)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
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[Catalina].StandardHost[localhost].StandardContext[/SimpleServletProject]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 6 more
Caused by: java.lang.NoClassDefFoundError: HttpServletRequest
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2693)
at java.lang.Class.getDeclaredMethods(Class.java:1967)
at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127)
at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:287)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:415)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:892)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at …直到昨天，我的 Web 项目都运行良好，但是今天当我启动我的 tomcat 服务器 7 时，它无法在 Eclipse 中以以下错误启动：
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/CiscoQA_Automation_Framework]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 7 more
Caused by: java.lang.NoClassDefFoundError: org/apache/logging/log4j/Logger
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:192)
at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:157)
at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1577)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1281)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5419)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1722)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1573)
... 19 more
在参考这里和其他几个链接之后，我清理了 WEB-INF/lib 和类路径，然后在 WEB-INF/lib 和类路径中添加了“log4j-web-2.3.jar”和“log4j-1.2.17.jar” . 我试过清理项目和 tomcat 工作目录，也没有任何效果。
<Server port="8005" shutdown="SHUTDOWN">
<Listener …无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost] .StandardContext [/ projectname]]
引起:java.lang.LinkageError:加载器约束违规:加载器(org/apache/catalina/loader/WebappClassLoader的实例)先前为名为"javax/servlet/ServletContext"的其他类型启动加载
org.apache.catalina.LifecycleException:无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost]]
在打印堆栈跟踪中,它也没有提供任何内容ClassNotFoundException :HttpServletRequest.
我在pom.xml文件中添加了tomcat maven插件.我想运行一些集成测试,所以我在集成开始之前添加了插件来运行.这是我的插件
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<port>8989</port>
<systemProperties>
<archaius.deployment.environment>test</archaius.deployment.environment>
</systemProperties>
<path>/${project.name}</path>
</configuration>
<executions>
<execution>
<id>tomcat-run</id>
<goals>
<goal>run</goal>
</goals>
<phase>pre-integration-test</phase>
<configuration>
<systemProperties>
<!-- We want test configuration for running integration tests. -->
<archaius.deployment.environment>test</archaius.deployment.environment>
<logback-lib.env>filesystem</logback-lib.env>
</systemProperties>
<fork>true</fork>
</configuration>
</execution>
<execution>
<id>tomcat-shutdown</id>
<goals>
<goal>shutdown</goal>
</goals>
<phase>post-integration-test</phase>
</execution>
</executions>
</plugin>
我在pom.xml文件中添加了这个插件.
我还添加servlet dependency并提供了范围provided.
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency> …