使用嵌入Maven的Tomcat启动应用程序

Question

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stacktrace：

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>

如果您想在tomcat lib中添加jar文件，您所能做的就是从https://commons.apache.org/proper/commons-io/download_io.cgi下载jar文件，然后转到安装tomcat的位置，转到lib文件夹并复制粘贴jar。在我的情况下，我的位置是

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

您也可以在本地系统中进行类似的检查。