java.lang.NoClassDefFoundError: when trying to run jar

Question

I have a spring boot project using gradle

apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'jetty'
apply plugin: 'war'
apply plugin: 'org.springframework.boot'

repositories {
    mavenCentral()
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web:1.5.1.RELEASE") {
        exclude module: "spring-boot-starter-tomcat"
    }
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-jetty', version: '1.5.1.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-actuator', version: '1.5.1.RELEASE'
    compile group: 'org.springframework', name: 'spring-webmvc', version: '4.3.6.RELEASE'
    compile group: 'org.springframework', name: 'spring-context-support', version: '4.3.6.RELEASE'
    compile group: 'org.springframework', name: 'spring-orm', version: '4.3.6.RELEASE'
    compile group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'
    compile group: 'org.freemarker', name: 'freemarker', version: '2.3.23'
    compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.5'
    compile group: 'org.hibernate', name: 'hibernate-core', version: '5.1.4.Final'
    compile group: 'commons-validator', name: 'commons-validator', version: '1.5.1'
    compile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '1.5.1.RELEASE'
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.2'
}

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.1.RELEASE")
    }
}

jar {
    baseName = 'base-name'
    version = '0.1.0'
    manifest {
        attributes 'Main-Class': 'some.application.Application'
    }
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

I build using
./gradlew clean jar
Then try to run using
java -jar <jar-name>.jar

However I get an error saying

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
        at some.application.Application.main(Application.java:11)
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 am so confused as to why I can run it in IDE but not as a jar. Also I found out that my jar doesn't contain any libraries at all.

EDIT:

This is my Application.class

package some.application;

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

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

I would compare the paths that IDE is using and the contents of the jar — bichito
– bichito, Commented Feb 25, 2017 at 16:09
@EduardoDennis edited question showing my Application.java. Is that what you meant by spring boot entry class? — Quillion
– Quillion, Commented Feb 25, 2017 at 16:21
@efekctive I just checked my jar, and apparently it does not contain any spring boot jars at all whatsoever. This explains then why it can't run anything. Do you know how I shove spring boot jars into my jar? — Quillion
– Quillion, Commented Feb 25, 2017 at 16:21
what happens when you do gradle install ? It doesnt bring in the dependencies? — Eddie Martinez
– Eddie Martinez, Commented Feb 25, 2017 at 16:24

Sasha Shpota · Accepted Answer · 2017-02-25 23:40:45Z

13

This is because your dependencies are not included into the end jar file.

Take a look on the examples here or here.

Or alternatively use ./gradlew clean build that should automatically pack the app correctly. Take a look on the official guide

answered Feb 25, 2017 at 23:40

Sasha Shpota

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1 Comment

Quillion Over a year ago

beautiful. Adding from { (configurations.runtime).collect { it.isDirectory() ? it : zipTree(it) } } worked like a charm for me :) thank you!

K. Symbol · Accepted Answer · 2020-01-19 03:12:04Z

1

Define a task called fatJar in build.gradle:

jar {
    baseName = 'base-name'
    version = '0.1.0'
    manifest {
        attributes(
                'Main-Class': 'com.github:'
        )
    }
}

task fatJar(type: Jar) {
    manifest.from jar.manifest
//    classifier = 'all'
    from {
        configurations.runtime.collect { it.isDirectory() ? it : zipTree(it) }
    } {
        exclude "META-INF/*.SF"
        exclude "META-INF/*.DSA"
        exclude "META-INF/*.RSA"
    }
    with jar
}

artifacts {
    archives fatJar
}

Run gradle fatJar or ./gradlew fatJar to generate a jar file with all dependencies, which can run independently but may be pretty large in size (that's why it's called a fat jar).

answered Jan 19, 2020 at 3:12

K. Symbol

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Comments

MegaFildi · Accepted Answer · 2023-08-15 10:41:48Z

1

From the official Spring-Boot-Site - link

Try creating a jar with: gradle clean bootJar

answered Aug 15, 2023 at 10:41

MegaFildi

111 bronze badge

1 Comment

Miss Skooter Over a year ago

Hello! Thank you for your answer. Can you please provide more information on how this helps OP's problem? Answers should preferably be self contained, meaning all necessary information to understand the answer should be written in the answer and not in external links because links can break over time. (Feel free to quote a source and link to it, but please put the important information here)

Ernestas Gruodis · Accepted Answer · 2023-05-14 08:54:35Z

-1

I tried out Sasha Shpota answer and that was my problem too... finally after hours of searching that helped me thanks a lot <3 added this to my grade.build:

jar {
   from {
           configurations.extraLibs.collect { it.isDirectory() ? it : 
  zipTree(it) }
          }
}

Better look at Sasha Shpotas answer

edited May 14, 2023 at 8:54

Ernestas Gruodis

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answered Apr 10, 2023 at 11:37

julez

1

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