Build fails about bigdata-file-viewer HOT 3 CLOSED

 mvn exec:java -Dexec.mainClass=org.eugene.App
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.eugene:BigdataFileViewer:jar:1.2-SNAPSHOT
[WARNING] 'build.pluginManagement.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-compiler-plugin @ line 134, column 17
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] --------------------< org.eugene:BigdataFileViewer >--------------------
[INFO] Building BigdataFileViewer 1.2-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:3.0.0:java (default-cli) @ BigdataFileViewer ---
[WARNING]
java.lang.ClassNotFoundException: org.eugene.App
    at java.net.URLClassLoader.findClass (URLClassLoader.java:435)
    at java.lang.ClassLoader.loadClass (ClassLoader.java:589)
    at java.lang.ClassLoader.loadClass (ClassLoader.java:522)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:246)
    at java.lang.Thread.run (Thread.java:832)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.031 s
[INFO] Finished at: 2020-08-27T13:04:57+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:java (default-cli) on project BigdataFileViewer: An exception occured while executing the Java class. org.eugene.App -> [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