No handler found for path in Helidon

November 24, 2022

I have created a simple endpoint in Helidon:

@GET
@Path("/sampleString")
@Produces(MediaType.APPLICATION_JSON)
public Message getSampleString() {
    return "{'Sample':'String'}";
}

The code complies and runs. But when I call:

curl -i http://localhost:8080/sampleString

I receive:

No handler found for path: /sampleString

What am I missing?

>Solution :

Most probably you are missing the META-INF/beans.xml file.

It should be as simple as that:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="https://jakarta.ee/xml/ns/jakartaee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee
                           https://jakarta.ee/xml/ns/jakartaee/beans_3_0.xsd"
       version="3.0"
       bean-discovery-mode="annotated">
</beans>

To check it you may set org.jboss.level=DEBUG in logging.properties. When you run your app, you should see something like:

 WARNING io.helidon.microprofile.server.ServerCdiExtension Thread[#1,main,5,main]: There are no JAX-RS applications or resources. Maybe you forgot META-INF/beans.xml file?