CODEWITHSUNDEEP
javaintellij-ideaexecutable-jar
rickmune
rickmune

Reputation: 3

Build an executable jar with external dependancies from intelij

I have a java console app with 5 classes and has one dependancy, gradle, com.google.code.gson. I do build an executable jar successfully, however I get the following error when I execute the jar using the command java -jar <jarName>.jar

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/gson/Gson Caused by: java.lang.ClassNotFoundException: com.google.gson.Gson at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)

Creating the artifact:

  1. File -> Project Structure -> Artifacts -> "Click on Plus button" -> JAR -> From module with dependancies

I expected the jar file to run

Upvotes: 0

Views: 128

Answers (1)

life888888
life888888

Reputation: 2979

build.gradle

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'com.google.code.gson:gson:2.10.1'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
}

test {
    useJUnitPlatform()
}

jar {
    manifest {
        attributes "Main-Class": "org.example.Main"
    }

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

IDEA Gui Right Side : Gralde Tab , YourProject -> Tasks -> jar

Find output jar file : YourProject -> build/libs : yourApp.jar

java -jar yourApp.jar

This method is create a fat jar, include dependencies class, only one jar.

No need other external jar files.

Upvotes: 0

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