So you’ve built a JAR with Netbeans, Maven project and get the “no main manifest attribute” error when you try to run it from the command line? When packaging the .jar file, you need to instruct the jar routine on how to pack it. If it is not able to find an entry,then it will complain with Unable to execute jar- file: “no main manifest attribute”.. MANIFEST.MF contains information about files contained in the Jar file. Any executable jar file Should run either by clicking or running using command prompt like java -jar app.jar (use "if path of jar contains space" - i.e. (What that class is depends on the program, it's impossible to tell from the information you've supplied). and does not contain the "Main-Class" declaration, then I think you found your problem. You might have the same problem as I do. java -cp was part of the answer, but I needed more specific info on how to identify the class to run. Steve Claridge
The last class has the main() method. java - Why has it failed to load main-class manifest attribute from a JAR file? java -jar "C:\folder name\app.jar"). installation - How do I find the location of my Python site-packages directory? If it is not able to find an entry,then it will complain with Unable to execute jar- file: “no main manifest attribute”.. MANIFEST.MF contains information about files contained in the Jar file. However with this information you can perhaps get some better help (given the fact that you have the same problem as I). Be aware of appending Main-Class entry on MANIFEST.MF file, check where you are saving it! If you are unsure what to put here, just copy the Main Class settings from the Rub tab in your Netbeans Project Properties. When you run self-executable jar, java will look for the Main-Class in MANIFEST.MF file located under META-INF folder. A lot of the solutions mentioned here didn't give me the whole picture, so I'll try to give you a summary of how to pack jar files from the command line. First, it's kind of weird, to see you run java -jar "app" and not java -jar app.jar, Second, to make a jar executable... you need to jar a file called META-INF/MANIFEST.MF. You might face the unsupported java version error. If it only says something like: Created-By: 1.8.0_51 (Oracle Corporation).
The -jar option only works if the JAR file is an executable JAR file, which means it must have a manifest file with a Main-Class attribute in it. If you are using the command line to assemble .jar it is possible to point to the main without adding Manifest file. Kindly let me know if you still have any issues. And then comes -C . Looking at other projects which did work, I noticed some minor differences in the manifest lines: Not sure why (I am only 3 months into java) or how, but can only say this worked. java -cp [Your JAR].jar [complete package].MainClass Note that there are several ways to get this done either with the CLI, Maven, Ant or Gradle: For CLI, the following command will do: (tks @dvvrt) Since your are running an executable jar file, Java will look for the manifest MANIFEST.MF located under META-INF/ which contains information about the files packaged.. Java must know the main class to run. Since your are running an executable jar file, Java will look for the manifest MANIFEST.MF located under META-INF/ which contains information about the files packaged.. Java must know the main class to run. How to fix Failed to load Main-Class manifest attribute from jar That should have been java -jar app.jar instead of java -jar "app". Having tried most all of the answers here and elsewhere to no avail, I returned to the art of "use what works". This information was missing in the MANIFEST.MF.Below the content of this file before adding the maven-jar-plugin : Although I don't know why there is a need to create a manifest-file. Up to now my app is 100% Netbeans - no tweaking (just a few shell escapes for the impossible!). or whatever your main file name is (make sure to add package name if it exists), or you can go to propeties of file and check, it helped me while most of the above answers did not. manifest.file=manifest.mf Then make sure you set a main class for the project in the properties dialog and select Build->Clean and Build Project . Create a text file called MANIFEST.MF in a folder called META-INF By
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