java.lang.LinkageError：加载器约束违规：loader（org / apache / catalina / loader / WebappClassLoader的实例）
[英]java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader)
问题描述
Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/projectname]]
无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost] .StandardContext [/ projectname]]
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]]
In print stack trace it is not giving any ClassNotFoundException :HttpServletRequest also. 在打印堆栈跟踪中，它没有给出任何ClassNotFoundException :HttpServletRequest 。
I have added tomcat maven plug-in in pom.xml file. 我在pom.xml文件中添加了tomcat maven插件。 I want to run some Integration Tests, so I added plug-in to run before integration starts. 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。 Here is my plug-in 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>/${project.name}</path>
</configuration>
<executions>
<execution>
<id>tomcat-run</id>
<goals>
<goal>run</goal>
</goals>
<phase>pre-integration-test</phase>
<configuration>
<systemProperties>
<!-- We want test configuration for running integration tests. -->
<archaius.deployment.environment>test</archaius.deployment.environment>
<logback-lib.env>filesystem</logback-lib.env>
</systemProperties>
<fork>true</fork>
</configuration>
</execution>
<execution>
<id>tomcat-shutdown</id>
<goals>
<goal>shutdown</goal>
</goals>
<phase>post-integration-test</phase>
</execution>
</executions>
</plugin>
this plug-in I added in pom.xml file. 我在pom.xml文件中添加了这个插件。
I also added servlet dependency and provided scope as provided only. 我还添加了servlet dependency ，并为提供范围provided唯一的。
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
When I do mvn clean install its giving following exception 当我做mvn clean install给出以下异常
SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/projectpath]] at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:192) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$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.ru
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.j
1 个解决方案
解决方案1
6 2016-09-29 06:55:11
I solved this issue, actually javax.servlet was internally invlolved by other dependencies http-lib and commons-util . 我解决了这个问题，实际上javax.servlet是由其他依赖项http-lib和commons-util内部调用的。
I used 我用了
<exclusions>
<exclusion>
<artifactId>servlet-api</artifactId>
<groupId>javax.servlet</groupId>
</exclusion>
</exclusions>
In both the dependencies. 在两个依赖项中。 Then the problem was solved 然后问题解决了
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