Gradle jar not running. Could not find or load main class

Question

I have created a very basic gradle java project that prints "Hello Word". The main class builds and runs fine. When i try to run java -jar out\artifacts\helloWorld_jar\helloWorld.jar on the command line it gives me this error

Error: Could not find or load main class com.exmple.helloWorld
Caused by: java.lang.ClassNotFoundException: com.exmple.helloWorld

here is how my directory looks

|-gradle
|-.idea
|-build
|-gradle
|-META-INF
|-out
 | -artifacts
 | -helloWorld_jar
 | -helloWorld.jar
|-src
 |-main
  |-java
   |- com.exmple
    |-helloWorld
 |-test
|build.gradle
etc...

My build.gradle file looks like this:

plugins {
    id 'java'
}

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

repositories {
    mavenCentral()
}
jar{
    manifest{
        attributes "Main-Class": "com.exmple.helloWorld"
    }

}
dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
}

test {
    useJUnitPlatform()
}

I have tried both single quotes and double quotes and it still runs an error. Any ideas on how to fix this? I have been trying for a few days now.

PS. example is spelt wrong, but its spelt exmple throughout

I think your missing the application plugin , https://docs.gradle.org/current/userguide/application_plugin.html — George, Feb 09 '22 at 12:23

Stephen C · Accepted Answer · 2022-02-10T03:52:46.673

1

If the full classname is com.exmpl.helloWorld, then the source directory structure should be:

|-src
 |-main
  |-java
   |-com
    |-exmpl
     |-helloWorld.java

not

|-src
 |-main
  |-java
   |-com.exmple
    |-helloWorld

Please read What does "Could not find or load main class" mean? for more information. (It explains in depth the many things that can cause this problem.)

edited Feb 10 '22 at 03:52

answered Feb 09 '22 at 13:53

Stephen C

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score 0 · Answer 2 · answered Feb 09 '22 at 12:20

0

It is looking like you have a typo in the path that you are passing:

Error: Could not find or load main class com.exmple.helloWorld Caused by: java.lang.ClassNotFoundException: com.exmple.helloWorld"

An A is missing from example package

answered Feb 09 '22 at 12:20

AdrianMirica

45
1
6

it is spelt exmple for everything. I know it is spelt wrong (oops). I have checked the package and the path and everything is exmple – Jane Feb 09 '22 at 12:29

Gradle jar not running. Could not find or load main class

2 Answers2