By
installation - How do I find the location of my Python site-packages directory? 1.Try restart the Eclipse (if you are using Eclipse to built JAR file) This solution relates to Netbeans version 8.0.2 and earlier. 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. Be aware of appending Main-Class entry on MANIFEST.MF file, check where you are saving it! (What that class is depends on the program, it's impossible to tell from the information you've supplied). Não é possível executar o jar-file: "no main manifest attribute" (20) (primeiro post - então pode não estar limpo) Esta é a minha correção para o OS X 11.6, programa Netbeans 8.2 baseado em Maven. Here is just the modified manifest block used: I found a new solution to bad manifest generation ! Recientemente empecé a jugar con Maven en Java. If it only says something like: Created-By: 1.8.0_51 (Oracle Corporation). Update: I just found a really neat way to specify the Application's entry point in eclipse. Differences between "java -cp" and "java -jar"? See Packaging Programs in JAR Files to learn how to create an executable JAR.. Copyright © 2020 More Of Less. There must be a way to fix this because the program runs fine on other systems. Check your .jar file in a zip program. Having tried most all of the answers here and elsewhere to no avail, I returned to the art of "use what works". If you are using the command line to assemble .jar it is possible to point to the main without adding Manifest file. You Can Simply follow this step 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. My problem was solved my moving META-INF to the resources folder. 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. Wondering how you could look at what's inside a jar file? If using Maven, include following in the pom. Here is what worked for me: App.class contained the main class to run. This happens because the project is being built by Maven and the Main Class you specified in the Netbeans properties is not exported by Netbeans to Maven’s pom.xml file; in other words: Netbeans knows what your main class is but Maven doesn’t. What solved it for me was to re-create the jar artifact, choosing JAR > From modules with dependencies, but not accepting the default Directory for META-INF/MANIFEST.MF. 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. java - What is the "Execute Around" idiom?
"No Main Manifest Attribute" dans ----. Up to now my app is 100% Netbeans - no tweaking (just a few shell escapes for the impossible!). Option f lets you specify the file name, option c creates an archive and option v sets the output to verbose. ). When I run it from the commandline with: Normally, if I had created the program myself, I would have added a main class attribute to the manifest file. Everyone knows that Spring Boot sets up a manifest like this, which varies from everyones asssumption that this is a standard .jar launch, which it may or may not be : Perhaps it needs to executed with org.springframework.boot.loader.JarLauncher on the classpath? (source). eg: java -cp AppleTCRuleAudit.jar com.apple.tcruleaudit.classes.TCRuleAudit. 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. 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. I do not know how to solve it, though. I spend lot of time to find the fix. Edit: I had tried with a manifest-file but didn't get it to work, but my mistake was to only name one of the classes when creating the jar-file. See Packaging Programs in JAR Files to learn how to create an executable JAR.. From there it was easy: I just use that path (minus the ".class" suffix): Since you've add MANIFEST.MF, I think you should consider the order of Field in this file. If it's not an executable JAR, then you'll need to run the program with something like: where com.somepackage.SomeClass is the class that contains the main method to run the program. Récemment, j'ai juste commencé à jouer autour avec Maven en java. When you run your JAR project from inside the Netbeans IDE you can set the main class from the Run tab of Project Properties, which means the code executes fine from within the IDE. That should have been java -jar app.jar instead of java -jar "app". As you might be knowing, Apache NetBeans 11.0 no longer allows a simple Java application; instead, you must create an application with Maven, Ant or Gradle. java -cp was part of the answer, but I needed more specific info on how to identify the class to run. If you find any entry like. Java will also throw Failed to load Main-Class manifest attribute from test.jar even if you have Main-Class attribute but not spelled correctly so watch out for spelling mistake there. 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. the file itself should have (at least) this one liner: Where com.mypackage.MyClass is the class holding the public static void main(String[] args) entry point. This information was missing in the MANIFEST.MF.Below the content of this file before adding the maven-jar-plugin : addClasspath, classpathPrefix were absent (deleted them), mainClass was missing the "com."