使用NetBeans运行Maven jgroups项目构建时出现java.lang.NoClassDefFoundError

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问题描述

我正在做一个聊天项目.当我在ide(netbeans)中运行它时，它可以正常打开并运行良好.但是当我从终端运行它时，我得到了这样的错误:

I am making a chat project. When i run it inside ide (netbeans) it opens normally and works great. But when i run it from terminal i'm getting error like this:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jgroups/Receiverat com.mycompany.chatapp1.ChatWindow.<init>(ChatWindow.java:32)at com.mycompany.chatapp1.Main.main(Main.java:10)Caused by: java.lang.ClassNotFoundException: org.jgroups.Receiverat java.net.URLClassLoader$1.run(URLClassLoader.java:372)at java.net.URLClassLoader$1.run(URLClassLoader.java:361)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:360)at java.lang.ClassLoader.loadClass(ClassLoader.java:424)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)at java.lang.ClassLoader.loadClass(ClassLoader.java:357)... 2 more

我通过命令java -jar ChatApp1-1.0-SNAPSHOT.jar

这是我的依赖项信息:<dependencies> <dependency> <groupId>org.jgroups</groupId> <artifactId>jgroups</artifactId> <version>3.4.3.Final</version> </dependency> </dependencies>

And here is my dependency info:<dependencies> <dependency> <groupId>org.jgroups</groupId> <artifactId>jgroups</artifactId> <version>3.4.3.Final</version> </dependency> </dependencies>

可能是什么问题?

推荐答案

创建jar项目时，不包括相关项目.因此，您可能需要通过-cp在命令行上设置类路径，这会非常麻烦，或者您可以使用 Maven Shade插件，其中包含您jar中的所有依赖项，从而生成了一个完整的可执行jar文件.

When you create a jar project, dependent projects are not included. So you would either need to set the classpath on the commandline via -cp which would be quite cumbersome, or you could use the Maven Shade Plugin, which includes all your dependencies in you jar, resulting in a complete, executable jar file.

在pom中包含以下代码段(当然，对于您的主要课程):

Include the following snippet in your pom (of course with your main class):

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.2</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <mainClass>my.main.class</mainClass>
                </transformer>
              </transformers>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

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