how to debug a Maven project

use remote debugging

mvn exec:exec -Dexec.executable="java" -Dexec.args="-classpath %classpath -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1044 com.mycompany.app.App"


Then in your eclipse, you can use remote debugging and attach the debugger to localhost:1044.