Question

我只是从https://github.com/storm-book/examples-ch02-getting_started克隆了项目，但是当我用命令

执行它时

mvn exec:java -Dexec.mainClass="TopologyMain" -Dexec.args="src/main/resources/words.txt"

我收到以下错误消息。

[INFO] Scanning for projects...
[INFO] 
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Getting-Started 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- exec-maven-plugin:1.3:java (default-cli) @ Getting-Started ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.
[WARNING] 
java.lang.ClassNotFoundException: TopologyMain
    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:323)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:281)
    at java.lang.Thread.run(Thread.java:701)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.771 s
[INFO] Finished at: 2014-06-01T11:29:45-06:00
[INFO] Final Memory: 11M/160M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3:java (default-cli) on project Getting-Started: An exception occured while executing the Java class. TopologyMain -> [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

您应该运行mvn compile，这将产生TopologyMain.class，然后才能使用mvn exec:java ...执行它。

这可以通过链接目标

在单个mvn命令中指定

mvn compile exec:java -Dexec.mainClass="TopologyMain" -Dexec.args="src/main/resources/words.txt"

Answer 2

在运行命令之前尝试清理并安装maven。从命令提示符，您可以执行以下操作

mvn -f pom.xml clean install

执行风暴程序但找不到类

2 个答案: