Spring Boot GS: ComponentScan and ClassNotFoundException for ConnectionFactory

Question

I'm playing sur the Spring Boot getting started guide but the auto configuration fails and I get:

 java.lang.ClassNotFoundException: javax.jms.ConnectionFactory 

It seems it's due to the location of the Application class. Where should it be located? At the top-level package (src/main/java) or in a specific package?

Answer 1

Your Application class should be placed in a specific package and not in the default (top-level) package. For example, put it in com.example and place all your application code in this package or in sub-packages like com.example.foo and com.example.bar.

Placing your Application class in the default package, i.e. directly in src/main/java isn't a good idea and it will almost certainly cause your application to fail to start. If you do so, you should see this warning:

** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package. 

Answer 2

Do not put the bootup Application Class in default package. This will solve the problem.

Working code:

package com.spring.boot.app;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;  @SpringBootApplication public class App {     public static void main(String[] args) {         SpringApplication.run(App.class, args);               } }