Spring Boot deployment - NoClassDefFoundError

Question

I'm trying to deploy Spring Boot application. I build a jar file through maven plugins. But I get an error saying:

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
        at com.spring-boot.example.AppConfig.main(AppConfig.java:18)
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

I tried adding additional plugins to the pom.xml file, but none of it worked. Any help will be very appreciated.

This is my pom.xml file:

<?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.spring-boot.example</groupId>
    <artifactId>spring-boot-example</artifactId>
    <version>0.1</version>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <start-class>com.spring-boot.example.AppConfig</start-class>

        <spring.version>4.0.7.RELEASE</spring.version>
        <log4j.version>1.2.17</log4j.version>
        <jdk.version>1.7</jdk.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.1.9.RELEASE</version>
    </parent>

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

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <version>1.2.1.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>


    </dependencies>

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

How are you building, deploying and running your application? The error means you are missing Spring jar files on the classpath. — Jesper, Oct 16 '15 at 09:09
I run it by clinking Plugins -> spring-boot:run-> "Run Maven Build". I deploy it by clicking Plugins -> jar:jar -> "Run Maven Build". — Someone, Oct 19 '15 at 10:28

abarisone · Answer 1 · 2015-10-16T09:22:28.327

First of all I would suggest you to upgrade your dependecies to the latest version of the Spring Boot framework, if applicable.

Besides, independently from the version you're using, the class you're missing is contained into this dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot</artifactId>
    <version>1.2.6.RELEASE</version>
</dependency>

but remember that all Spring Boot dependencies rely on Spring framework transitive dependencies, so check in your IDE's dependency hierarchy panel if they are present.

Depending on the way you're deploying your application you must be sure that all dependencies are available at runtime.

This can be obtained using, for example, the repackage goal into the spring-boot-maven-plugin in your pom's build section:

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot-version}</version>
                <configuration>
                    <mainClass>your-main-class</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
       </plugins>
</build>

I can't change the version, I get errors. I did change the plugin, but the result is the same as before (I get an exception java.lang.NoClassDefFoundError). — Someone, Oct 19 '15 at 10:50
Ok, I solved it. For people with the same problem: http://stackoverflow.com/questions/23868580/one-spring-boot-project-deploy-to-both-jar-or-war — Someone, Oct 19 '15 at 11:03

score 0 · Answer 2 · answered Oct 16 '15 at 09:41

0

I would suggest using maven assembly plugin so that all dependencies will be present in jar file after it is built. Here is documentation for it: http://maven.apache.org/plugins/maven-assembly-plugin/

answered Oct 16 '15 at 09:41

Daniel Hajduk

336
3
15

score -2 · Answer 3 · answered Jul 15 '18 at 06:59

-2

try $ mvn dependency:purge-local-repository from your terminal. It may be because some of your dependency got corrupted. This command worked for me

answered Jul 15 '18 at 06:59

Gr8Warrior

699
7
11

Spring Boot deployment - NoClassDefFoundError

3 Answers3