Question

我想使用embedded tomcat而不是独立版本来启动Web应用程序。为此，我在pom.xml中声明了tomcat maven插件。当我尝试启动该程序时，我收到此错误：

Exception in thread "Thread-2" java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
at org.apache.tomcat.maven.plugin.tomcat7.run.RunMojo$2.run(RunMojo.java:295)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils
at  org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
... 1 more

这是我的POM.xml的配置：

    <build>
  <plugins>
    <plugin>
      <groupId>org.apache.tomcat.maven</groupId>
      <artifactId>tomcat7-maven-plugin</artifactId>
      <version>${tomcat-maven-plugin.version}</version>
      <configuration>
        <port>8080</port>
        <path>/ppc-v2.webapp</path>
      </configuration>
      <dependencies>
        <dependency>
          <groupId>upgrade.karavel.framework</groupId>
          <artifactId>framework.integration.camel.extension</artifactId>
          <version>${framework.camel.extension.version}</version>
          <exclusions>
            <exclusion>
              <groupId>org.apache.geronimo.specs</groupId>
              <artifactId>geronimo-servlet_2.5_spec</artifactId>
            </exclusion>
          </exclusions>
        </dependency>
        <dependency>
          <groupId>upgrade.karavel.framework</groupId>
          <artifactId>framework.frontend.web</artifactId>
          <version>${framework.frontend.web.version}</version>
          <exclusions>
            <exclusion>
              <groupId>org.springframework.webflow</groupId>
              <artifactId>spring-webflow</artifactId>
            </exclusion>
            <exclusion>
              <groupId>javax.servlet</groupId>
              <artifactId>servlet-api</artifactId>
            </exclusion>
          </exclusions>
        </dependency>
      </dependencies>
    </plugin>
  </plugins>
</build>

编辑：我在日志顶部有以下堆栈跟踪：

GRAVE：子容器在启动过程中失败 java.util.concurrent.ExecutionException：org.apache.catalina.LifecycleException：无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost] .StandardContext [/ppc-v2.webapp]] 在java.util.concurrent.FutureTask.report（FutureTask.java:122）在java.util.concurrent.FutureTask.get（FutureTask.java:192）在org.apache.catalina.core.ContainerBase.startInternal（ContainerBase.java:1123）在org.apache.catalina.core.StandardHost.startInternal（StandardHost.java:800）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1559）在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1549）在java.util.concurrent.FutureTask.run（FutureTask.java:266）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149）在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624）在java.lang.Thread.run（Thread.java:748）由以下原因引起：org.apache.catalina.LifecycleException：无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost] .StandardContext [/ppc-v2.webapp]] 在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:154） ...另外6个引起原因：java.lang.ClassCastException：org.springframework.web.SpringServletContainerInitializer无法转换为javax.servlet.ServletContainerInitializer 在org.apache.catalina.startup.ContextConfig.getServletContainerInitializer（ContextConfig.java:1670）在org.apache.catalina.startup.ContextConfig.getServletContainerInitializers（ContextConfig.java:1652）在org.apache.catalina.startup.ContextConfig.processServletContainerInitializers（ContextConfig.java:1562）在org.apache.catalina.startup.ContextConfig.webConfig（ContextConfig.java:1270）在org.apache.catalina.startup.ContextConfig.configureStart（ContextConfig.java:878）在org.apache.catalina.startup.ContextConfig.lifecycleEvent（ContextConfig.java:376）在org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent（LifecycleSupport.java:119）在org.apache.catalina.util.LifecycleBase.fireLifecycleEvent（LifecycleBase.java:90）在org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5322）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150） ...另外6个九月03，2018 12:34:07 PM org.apache.catalina.core.ContainerBase startInternal GRAVE：子容器在启动过程中失败 java.util.concurrent.ExecutionException：org.apache.catalina.LifecycleException：无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost]] 在java.util.concurrent.FutureTask.report（FutureTask.java:122）在java.util.concurrent.FutureTask.get（FutureTask.java:192）在org.apache.catalina.core.ContainerBase.startInternal（ContainerBase.java:1123）在org.apache.catalina.core.StandardEngine.startInternal（StandardEngine.java:302）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）在org.apache.catalina.core.StandardService.startInternal（StandardService.java:443）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）在org.apache.catalina.core.StandardServer.startInternal（StandardServer.java:732）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）在org.apache.catalina.startup.Tomcat.start（Tomcat.java:341）在org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.startContainer（AbstractRunMojo.java:1238）在org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.execute（AbstractRunMojo.java:592）在org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo（DefaultBuildPluginManager.java:132）在org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:208）在org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:153）在org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:145）在org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder.java:116）在org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder.java:80）在org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build（SingleThreadedBuilder.java:51）在org.apache.maven.lifecycle.internal.LifecycleStarter.execute（LifecycleStarter.java:120）在org.apache.maven.DefaultMaven.doExecute（DefaultMaven.java:347）在org.apache.maven.DefaultMaven.execute（DefaultMaven.java:154）在org.apache.maven.cli.MavenCli.execute（MavenCli.java:582）在org.apache.maven.cli.MavenCli.doMain（MavenCli.java:214）在org.apache.maven.cli.MavenCli.main（MavenCli.java:158）在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）在org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced（Launcher.java:289）在org.codehaus.plexus.classworlds.launcher.Launcher.launch（Launcher.java:229）在org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode（Launcher.java:415）在org.codehaus.plexus.classworlds.launcher.Launcher.main（Launcher.java:356）原因：org.apache.catalina.LifecycleException：无法启动组件[StandardEngine [Tomcat] .StandardHost [localhost]] 在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:154）在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1559）在org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1549）在java.util.concurrent.FutureTask.run（FutureTask.java:266）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149）在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624）在java.lang.Thread.run（Thread.java:748）由以下原因引起：org.apache.catalina.LifecycleException：子容器在启动期间失败在org.apache.catalina.core.ContainerBase.startInternal（ContainerBase.java:1131）在org.apache.catalina.core.StandardHost.startInternal（StandardHost.java:800）在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150） ...还有6个

Answer 1

您可以通过在pom.xml中添加此依赖项来包含Apache commons-io jar

<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

如果您要将jar文件添加到tomcat lib中，您所能做的就是从https://commons.apache.org/proper/commons-io/download_io.cgi下载jar文件并转到已安装tomcat的位置，然后转到lib文件夹并复制粘贴jar。就我而言，我的位置是

C:\Program Files\Apache Software Foundation\Tomcat 9.0\lib

您可以类似地在本地系统中签入。

Answer 2

谢谢大家，但您无法解决我的问题：D 我注意到我仍在使用jetty插件，并且其中一个名为jetty-jndi的依赖项（其中包括servlet-api）与嵌入式tomcat的servlet-api有冲突。由于某些未知的原因，我在maven依赖项：Eclipse树中看不到这个jar。

这就是我收到此错误的原因。

谢谢。

最好的问候

在将Tomcat Embedded与Maven结合使用时启动应用程序

2 个答案: