Error: Could Not Find or Load Main Class in Intellij Ide

Could not find or load main class with IntelliJ Application configuration

The issue comes from the fact that the project has an Android module. The module needs the android gradle plugin which is globally applied to all modules in the project, even those which aren't android modules. When applied to a module, it adds an Android-Gradle facet that changes the module classpath from the default out/classes to build/classes/java. For kotlin modules, the main class can't be found at runtime since the classpath is wrong.

There's is currently no way to apply the android plugin to only android modules. Workarounds include patching the android.jar file, automatically removing the Android-Gradle facet on sync, or moving the android module to an external project. There's no clean way to do it.

The issue has already been reported here, but it shows no sign that it will ever be fixed.

Unable to find or load Main Class in Intellij 2019.4

Thanks to CrazyCoder for pointing out the errors in my project (silly mistakes). It seems that after I have resolved those mistakes.

• I had to follow the solutions I have posted then rebuild the .jar file.
• Afterwards I need to mark the src folder as a source root folder (right click folder -> Mark Directory as -> sources root)
• Edit Configurations if pointing to wrong main class.
• Set Project compiler output (File -> Project Structure -> Project) to a folder designated to hold the output (any folder basically in or outside the project).

Intellij IDEA: Could not find or load main class if Dependencies Storage Format is changed to Eclipse

Thanks for the report, it appears to be a bug in IntelliJ IDEA project configuration when the dependencies format is set to Eclipse. IDE loads the project incorrectly and the sources root configuration is lost, therefore compiler doesn't get the correct information about the source files and nothing is produced in the output directory. Classpath doesn't contain any classes and the execution of the main class fails since it doesn't exist in the output (classpath).

.jar file error could not find or load main class with IntelliJ

The META-INF folder in your generated Jar has these 2 files -

SIGNINGGC.RSA
SIGNINGGC.SF

I assume that you are not signing the Jar. Then, these files must be coming from one of your dependancies when you are creating a Fat Jar. If any of your dependancies has a Signed Jar, then it could result into that could not find or load main class: exception.

You can quickly find if this is the issue by removing those files with this command (referenced from here) and try and run the code -

zip -d yourjar.jar 'META-INF/*.SF' 'META-INF/*.RSA' 'META-INF/*.DSA'

IntelliJ shows 2 Options while generating Jar. The first one will generate a Fat Jar. The other option will keep the other library jars intact and link with them using Manifest file.

Assuming all you need is to run your code, use the second option in the Create Jar from Modules Dialog box.

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