我第一次使用Maven時，就陷入了依賴關(guān)系中。我使用Eclipse創(chuàng)建了一個Maven項目并添加了依賴項，并且該項目運行正常。但是當(dāng)我嘗試通過命令行運行它時：$ mvn package  # successfully completes$ java -cp target/bil138_4-0.0.1-SNAPSHOT.jar tr.edu.hacettepe.cs.b21127113.bil138_4.App # NoClassDefFoundError for dependencies它下載依賴項，成功構(gòu)建，但是當(dāng)我嘗試運行它時，出現(xiàn)NoClassDefFoundError：Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/jackson/JsonParseException        at tr.edu.hacettepe.cs.b21127113.bil138_4.db.DatabaseManager.<init>(DatabaseManager.java:16)        at tr.edu.hacettepe.cs.b21127113.bil138_4.db.DatabaseManager.<init>(DatabaseManager.java:22)        at tr.edu.hacettepe.cs.b21127113.bil138_4.App.main(App.java:10)Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.JsonParseException        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)        at java.security.AccessController.doPrivileged(Native Method)        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)        ... 3 more我的pom.xml是這樣的：<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>tr.edu.hacettepe.cs.b21127113</groupId>  <artifactId>bil138_4</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>bil138_4</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>            <dependency>            <groupId>org.codehaus.jackson</groupId>            <artifactId>jackson-core-asl</artifactId>               </dependency> 誰能幫我？