Failing to run jar file from command line no main manifest attribute

Question

I am trying to run a jar file from the console   java -jar ScrumTimeCaptureMaintenence jar   And am getting the error      Can t execute jar- file     no main manifest attribute      As you can see I do in fact have a main file and it runs fine from eclipse     What do I need to do to successfully run this file from the command line

User · Answer

You can select the  Runnable JAR File  after you click on  Export    You can specify your main driver in  Launch Configuration

User · Answer

Export you Java Project as an Runnable Jar file rather than Jar    I exported my project as Jar and even though the Manifest was present it gave me the error no main manifest attribute in jar even though the Manifest file was present in the Jar   However there is only one entry in the Manifest file and it didn t specify the Main class or Function to execute or any dependent JAR s  After exporting it as Runnable Jar file it works as expected

User · Answer

In Eclipse  right-click on your project -  Export -  JAR file  At last page with options  when there will be no Next button active  you will see settings for Main class   You need to set here class with main method which should be executed by default  like when JAR file will be double-clicked

User · Answer

First run your application from eclipse to create launch configuration  Then just follow the steps                          From the menu bar s File menu  select Export                              Expand the Java node and select Runnable JAR file  Click Next                              In the                       Runnable JAR File Specification page  select a  Java Application  launch configuration to use to create a   runnable JAR                              In the Export destination field  either type or click Browse to select a location           for the JAR file                              Select an appropriate library   handling strategy                              Optionally  you can also create an ANT script to quickly regenerate a previously created runnable JAR file                     Source  Creating a New Runnable JAR File at Eclipse org

User · Answer

Try to run  java -cp ScrumTimeCaptureMaintenence jar Main

User · Answer

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 it s not an executable JAR  then you ll need to run the program with something like   java -cp app jar com somepackage SomeClass   where com somepackage SomeClass is the class that contains the main method to run the program

User · Answer

If you are using Spring boot  you should add this plugin in your pom xml    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-maven-plugin lt  artifactId gt           lt  plugin gt       lt  plugins gt   lt  build gt

User · Answer

You need to include  Main class  attribute in Manisfest mf file in Jar  For example  Main-Class  MyClassName  Second thing  To add Manifest file in Your jar  You can manually create file in your workspace folder  and refresh in Eclipse Project explorer    While exporting  Eclipse will create a Jar which will include your manifest   Cheers

[java] Failing to run jar file from command line: “no main manifest attribute”

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