Maven多模块

Question

我已经在我的项目中创建了两个模块。它已编译但未正确执行。请帮助我解决此问题的任何人。在这里，我还提供了我的完整错误日志。 错误日志：

C:\workspace\multimaven>mvn exec:java -Dexec.mainClass="com.multimaven.module2.DerivedClass" 
[INFO] Scanning for projects... 
[INFO] ------------------------------------------------------------------------ 
[INFO] Reactor Build Order: 
[INFO] 
[INFO] multimaven 
[INFO] module1 
[INFO] module2 
[INFO] 
[INFO] ------------------------------------------------------------------------ 
[INFO] Building multimaven 0.0.1-SNAPSHOT 
[INFO] ------------------------------------------------------------------------ 
[INFO] 
[INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ multimaven --- 
[WARNING] 
java.lang.ClassNotFoundException: com.multimaven.module2.DerivedClass 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
     at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:270) 
     at java.lang.Thread.run(Thread.java:745) 
[INFO] ------------------------------------------------------------------------ 
[INFO] Reactor Summary: 
[INFO] 
[INFO] multimaven ......................................... FAILURE [ 0.375 s] 
[INFO] module1 ............................................ SKIPPED 
[INFO] module2 ............................................ SKIPPED 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD FAILURE 
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time: 0.734 s 
[INFO] Finished at: 2017-04-12T12:56:43+05:30 
[INFO] Final Memory: 9M/153M 
[INFO] ------------------------------------------------------------------------ 
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project multimaven: An exception occured while executing the Java class. com.multimaven.module2.DerivedClass -> [Help 1] 
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. 
[ERROR] Re-run Maven using the -X switch to enable full debug logging. 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles: 
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException 

Answer 1

这与maven多模块性质无关。编译前您可能正在运行插件。确保您定义以下，

<plugin> 
    <groupId>org.codehaus.mojo</groupId> 
    <artifactId>exec-maven-plugin</artifactId> 
    <version>1.2.1</version> 
    <configuration>     
     <mainClass>com.multimaven.module2.DerivedClass</mainClass> 
    </configuration> 
</plugin> 

和运行插件，之前做以下，

mvn clean install然后mvn exec:java或像你通过命令行做。