java.lang.LinkageError的：裝載機約束衝突：裝載機（的組織/實例阿帕奇/卡塔利娜/裝載機/ WebappClassLoader）

Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/projectname]]java.lang.LinkageError的：裝載機約束衝突：裝載機（的組織/實例阿帕奇/卡塔利娜/裝載機/ WebappClassLoader）

Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/servlet/ServletContext"

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]]

在打印堆棧跟蹤它沒有給予任何ClassNotFoundException :HttpServletRequest也。

我已經在pom.xml文件中添加了tomcat maven插件。我想運行一些集成測試，因此我添加了插件以在集成開始之前運行。這是我的插件

<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>

這個插件我pom.xml文件添加。

我也加了servlet dependency，只提供範圍爲provided。

<dependency> 
    <groupId>javax.servlet</groupId> 
    <artifactId>javax.servlet-api</artifactId> 
    <version>3.1.0</version> 
    <scope>provided</scope> 
</dependency>

當我做mvn clean install它下面的異常

SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/projectpath]] 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:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 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[Tomcat].StandardHost[localhost].StandardContext[/projectpath]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) ... 6 more Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/servlet/ServletContext" at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1191) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1669) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.getDeclaredMethods(Class.java:1975) at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127) at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:281) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationFilterAnnotations(WebAnnotationSet.java:113) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66) at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) 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:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more

Sep 28, 2016 12:29:26 PM org.apache.catalina.core.ContainerBase startInternal SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]] 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.StandardEngine.startInternal(StandardEngine.java:302) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.startup.Tomcat.start(Tomcat.java:341) at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.startContainer(AbstractRunMojo.java:1238) at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.execute(AbstractRunMojo.java:592) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 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: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more

來源

2016-09-28 Sat

可能重複的[java.lang.ClassNotFoundException：HttpServletRequest]（http://stackoverflow.com/questions/10556201/java-lang-classnotfoundexception-httpservletrequest） – amdev

但是沒有java.lang。 ClassNotFoundException：堆棧跟蹤中的HttpServletRequest，我還添加了servlet依賴項，它是如何CLassNotFoundException？ – Sat

對我來說，這聽起來像是與你的servlet-api和tomcat提供的servlet-api的衝突。什麼是你的容器tomcat 7或8？嘗試8與您的servlet-api 3.1並將項目小平面動態web模塊設置爲3.1。或者嘗試使用tomcat 7.0.72和facet 3.0降級到3.0.1。而重複問題的題目是錯誤的，他問題的根源與你相同。我假設你評論「tomcat7-maven-plugin」它有效嗎？ – amdev

我解決了這個問題給予，實際上javax.servlet在內部通過其他依賴http-lib和commons-util invlolved。

我用

<exclusions> 
    <exclusion> 
     <artifactId>servlet-api</artifactId> 
     <groupId>javax.servlet</groupId> 
    </exclusion> 
</exclusions>

在這兩種依賴性。然後問題解決了

來源

2016-09-29 06:55:11 Sat

java.lang.LinkageError的：裝載機約束衝突：裝載機（的組織/實例阿帕奇/卡塔利娜/裝載機/ WebappClassLoader）

回答

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