Spring Boot GS: ComponentScan and ClassNotFoundException for ConnectionFactory - maven

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);
}
}

Answer 3

You need the main class to be inside a package. Because Spring boot annotation #SpringBootApplication will look for a package to scan while launching the app.
So make sure there is a package statement on top of your main class file. That's it.

Answer 4

I had got the same Problem,
Soon I realized that I hadn't included my MAIN method in package.
After including main inside the package , spring boot performed without glitches.
Sample program (Basic) -
package springbootquickstart;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class application {
public static void main(String[] args) {
// TODO Auto-generated method stub
SpringApplication.run(application.class, args);
}
}

Answer 5

Your configuration should looks like this and the Application.java should be at the root of you packages E.g /src/main/java/io/eddumelendez
io.eddumelendez is my package
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.1.RELEASE</version>
<relativePath />
</parent>
<groupId>io.eddumelendez.jms</groupId>
<artifactId>spring-boot-jms-sample</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>qa</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-broker</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>