Vert.x ConfigRetriever.listen does not get triggered when the config file changes - vert.x

Question

I have a simple vertical that I am using to test the ConfigRetriever.listen for changes.
Using Vert.x version 4.3.4
import io.vertx.config.ConfigRetriever;
import io.vertx.config.ConfigRetrieverOptions;
import io.vertx.config.ConfigStoreOptions;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.json.JsonObject;
public class MyVerticle extends AbstractVerticle {
#Override
public void start() {
ConfigStoreOptions fileStore = new ConfigStoreOptions().setType("file")
.setFormat("yaml")
.setConfig(new JsonObject().put("path", "config.yaml"));
ConfigRetrieverOptions options = new ConfigRetrieverOptions().setScanPeriod(1000)
.addStore(fileStore);
ConfigRetriever retriever = ConfigRetriever.create(vertx, options);
retriever.listen(change -> {
JsonObject previous = change.getPreviousConfiguration();
System.out.println(previous);
JsonObject changedConf = change.getNewConfiguration();
System.out.println(changedConf);
});
}
}
[Edit] The config file is under src/main/resource
When I run this, I get an output of the before as empty and after as config in my yaml file.
{}
{"bridgeservice":{"eb_address":"xyz","path":"/api/v1/aaa/","port":80}}
The problem is when I change the value in the yaml config file nothing happens. I expect the changes to get printed. When I am running this in the debugger I see
Thread [vert.x-internal-blocking-0] (Running)
..
..
..
Thread [vert.x-internal-blocking-19] (Running)
When I put the following just before the retriever.listen() , I get the succeeded... line printed and nothing from the listen method even after changing the config file values.
retriever.getConfig(ar -> {
if (ar.succeeded()) {
System.out.println("succeeded :" + ar.result());
}
else {
ar.cause()
.printStackTrace();
}
});
May be related to SO having-trouble-listen-vert-x-config-change
[Edit] The config file is under src/main/resource

Answer 1

When I moved my config file from resources to a folder cfg at the same level as src the Verticle behaved as it should and picked up config changes. I don't know why, maybe it's an eclipse environment thing.