This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
If you open a command prompt at D:\TestProject\EventFile_Process and run "mvn install", does it work?
I have never used the maven plugin for ant, but from my reading the artifact:pom task populates the Ant build with the Maven properties. Thus it does not invoke the POM using Maven. To invoke the Maven build, you need to use the artifact:mvn task (http://maven.apache.org/ant-tasks/examples/mvn.html)