![]() ,The Gradle answer is to add a jar/manifest/attributes setting like this:įor Maven, something like the following snippet should do the trick. pom.xmlĬan't execute jar- file: “no main manifest attribute”,no main manifest attribute, in "app.jar",You get this "no main manifest attribute" error when this line is missing from the MANIFEST.MF file. You can put maven-jar-plugin plugin in pom.xml to fix it. ![]() You might get this error when Main-Class entry is missing in MANIFEST.MF file. You might get this error.,MANIFEST.MF contains information about files contained in the Jar file. If it is not able to find an entry,then it will complain with Unable to execute jar- file: “no main manifest attribute”.,Once you run the above-mentioned solution and reopen MANIFEST.MF file in jar again, you will see Main-Class entry.,When you have a self-executable jar and trying to execute it. When you run self-executable jar, java will look for the Main-Class in MANIFEST.MF file located under META-INF folder. Java developers tutorials and coding.,Java Multithreading Interview Questions and Answers ,Java 8 new features : Lambda expressions, optional class, Defender methods with examples ,Count total number of times each alphabet appears in the string java program code with example If it's not an executable JAR, then you'll need to run the program with something like: java -cp app.jar you need to jar a file called META-INF/MANIFEST.MF xml to fix it.,Second, to make a jar executable. You can put the maven-jar-plugin plugin in pom. If it is not able to find an entry, then it will complain about Unable to execute jar- file: “no main manifest attribute”.,Main-class property is missing on your jars META-INF/MANIFEST.MF. Correct it by adding the following lines to your pom.xml,You might get this error when the Main-Class entry is missing in MANIFEST. MF file located under the META-INF folder. ![]() When you run a self-executable jar, java will look for the Main-Class in MANIFEST. The file itself should have (at least) this one liner: Main-Class: 圜lassįor CLI, the following command will do: (tks dvvrt) jar cmvf META-INF/MANIFEST.MF. ,It's really a huge mess to specify this attribute inside the MANIFEST.MF file.,Create a text file called MANIFEST.MF in a folder called META-INF The main attribute inside the MANIFEST.MF looks like this:,You get this "no main manifest attribute" error when this line is missing from the MANIFEST.MF file.
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