ClassNotFoundException while running a Spring Boot application

Question

I am new to Spring boot.I am getting ClassNotFoundException :Spring Application while doing the sample example using spring 1.5.7. I googled for solution and added spring boot maven build plugin.But still the problem not resolved. Please help.

 <?xml version="1.0" encoding="UTF-8"?>
<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>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Below is my main class

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

I am getting the below Exception :

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
    at com.example.demo.DemoApplication.main(DemoApplication.java:10)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 1 more

please provide more details like code snippet and complete stack trace in order to better understand your problem — spuente
– spuente, Commented Sep 26, 2017 at 1:11

code-4-fun · Accepted Answer · 2017-09-26 02:08:47Z

4

It seems to me that relevant dependencies are not downloaded from maven repo. Try following command and check if the package compiles okay!

./mvnw clean package

answered Sep 26, 2017 at 2:08

code-4-fun

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shanmugaprabhu · Accepted Answer · 2017-09-26 02:27:53Z

2

The best way to create a spring boot project from scratch irrespective of build tool (maven, gradle, etc..) is to use https://start.spring.io/ search for your dependencies like (Web, actuator, etc..) and generate the project. Unzip the downloaded project and type the respective command mvn spring-boot:run in your case.

answered Sep 26, 2017 at 2:27

shanmugaprabhu

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2 Comments

Gundamaiah Over a year ago

I am using STS and created the project using Spring Starter Project

shanmugaprabhu Over a year ago

Did you try running mvn spring-boot:run from command line ? If so can you try clearing your local maven repository (windows : c:\users\<username>\.m2 mac : ~\.m2) and then run it again? See if your maven command result whether it is downloading any dependencies, or if it throws any error while downloading it.

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