在Verticle中调用container.deployVerticle时，java.lang.ClassNotFoundException

Question

I am a newbie regarding Vertx, so this might be a simple question. When i try to run a verticle from commandline i allways get a ClassNotFoundException when i try to programatically deploy another verticle :

container.deployVerticle("melby.poc.verticles.AuditVerticle"); AuditVerticle is itself a verticle, and is located in a sub package from the main" verticle that i try to run

I have also tried to run this as a module as well without any luck command i use to run the verticle is : vertx run src\\main\\java\\melby\\poc\\Server.java

Consolle output when i try to start the verticle is :

Succeeded in deploying verticle
Exception in Java verticle
java.lang.ClassNotFoundException: melby.poc.verticles.AuditVerticle
        at org.vertx.java.platform.impl.ModuleClassLoader.loadFromModule(ModuleC
lassLoader.java:127)
        at org.vertx.java.platform.impl.ModuleClassLoader.loadClass(ModuleClassL
oader.java:108)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.vertx.java.platform.impl.java.JavaVerticleFactory.createVerticle(
JavaVerticleFactory.java:55)
        at org.vertx.java.platform.impl.DefaultPlatformManager$21.run(DefaultPla
tformManager.java:1748)
        at org.vertx.java.core.impl.DefaultContext$3.run(DefaultContext.java:175
)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(Single
ThreadEventExecutor.java:370)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThread
EventExecutor.java:116)
        at java.lang.Thread.run(Thread.java:745)

I use vertx 2.1.5 and java 8 Do i somehow need to change/add the classpath for vertx so it is able to load the classes in the same source folder ?

Update : I was able to make it work by adding a mod.json file defining the runnable verticle and adding this file to the root catalog. From this catalog i am now able to run the command : vertx run src\\main\\java\\melby\\poc\\Server.java -cp target/classes I still dont anderstand why I need a mod.json file and why i need to define -cp If i dont programatically deploy verticles i dont need this.