CODEWITHSUNDEEP
java
neil
neil

Reputation: 1

executable jar Could not find or load main class

I've been struggling with this common error and just can't resolve it. This application is composed of multiple packages and runs fine within JCreator (at the moment I need to use this IDE rather than Eclipse).

My manifest file is here (there are 2 blank lines at the end):

Manifest-Version: 1.0
Created-By: 1.6.0_45 (Sun Microsystems Inc.)
Main-Class: C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\main\DPMain

I wrote a bat file to create the jar:

jar -cvfm DPlus.jar C:\COMPILE\MyProjects\douwe\classes\MANIFEST.MF C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\main*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\library*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\command*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\file*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\file\display*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\command*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\file*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\file\display*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\gui*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\gui*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\job*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\job*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\types*.class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\util*.class

When I try to execute with the command

C:\COMPILE\MyProjects\douwe\classes>java -jar DPlus.jar

I always get the error:

Error: Could not find or load main class C:\COMPILE\MyProjects\douwe\classes\dykstra\dplus\main\DPMain

Can anyone see what I'm doing wrong here?

Upvotes: 0

Views: 1428

Answers (2)

Ruelos Joel
Ruelos Joel

Reputation: 2389

Usually this error is due to MANIFEST.MF if the'res no application's entry point has been set. Your manifest file should have this line of code

Main-Class: YourPackage.DPMain

Alternatively, you can do the following.

java -cp .;app.jar YourPackage.DPMain

Upvotes: 1

yellowB
yellowB

Reputation: 3020

In my implementation, there are something different from yours, you can refer:

(1) The folder(before compressed) structure you need to add a META-INF folder and put your MANIFEST.MF in it

enter image description here

(2) The content in your MANIFEST.MF I think your should use the package format instead of a folder tree format:

Manifest-Version: 1.0
Main-Class: com.loadtest.mgr.LoadTestStarter

Upvotes: 0

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