How to setup Main class in manifest file in jar produced by NetBeans project

Question

I have the following problem  I have a Java project in my NetBeans IDE 6 8  When I compile it and it produces a  jar file containing everything possible  the META-INF is not right  It doesn t contain the class to be executed - with main   method    When I click the Run button inside the IDE  everything works  The settings of the project are also set the right way - pointing to a class in my project   I tried adding a folder META-INF with manifest file but I didn t manage   Is there a way to do this manually in NetBeans  because I found that if I add the missing Main class in the manifest  everything works    I suppose I hit some sort of bug        edit  The result I m after is that I want the jar that is created with the build of NetBeans to be executable with command   Quote from Sun Documentation    When the Main-Class is set in the manifest file  you can run the application from the command line   java -jar app jar

User · Answer

Don t hesitate but look into your project files after you have built your project for the first time  Look for a manifest file and choose open with notepad   Add the line   Main-Class  package myMainClassName   Where package is your package and myClassName is the class with the main String   args  method

User · Answer

I m going to make a summary of the proposed solutions and the one that helped me   After reading this bug report   bug in the way NetBeans 6 8 creates the jar for a Java Library Project    Create a manifest mf file in my project root Edit manifest mf  Mine looked something like this   Manifest-Version  1 0 Ant-Version  Apache Ant 1 7 1 Created-By  16 3-b01  Sun Microsystems Inc   Main-Class  com example MainClass Class-Path  lib lib1 jar lib lib2 jar  Open file  nbproject project properties Add line  manifest file manifest mf Clean   Build of project   Now the  jar is successfully build   Thank you very much vkraemer

User · Answer

Adding manifest file manifest mf into project properties and creating manifest mf file in the project directory works fine in NB 6 9 and should work also in NB 6 8

User · Answer

It looks like you are running into a bug in the way NetBeans 6 8 creates the jar for a Java Library Project     The issue implies that there is a work-around   I have not been able to verify that with NB 6 8 and or NetBeans 6 9-dev     You may want to register with the NetBeans org website issue tracker and update the issue and add your  vote

User · Answer

The real problem is how Netbeans JARs its projects  The  Class-Path   in the Manifest file is unnecessary when actually publishing your program for others to use  If you have an external Library added in Netbeans it acts as a package  I suggest you use a program like WINRAR to view the files within the jar and add your libraries as packages directly into the jar file   How the inside of the jar file should look   MyProject jar      Manifest MF          Main-Class  mainClassFolder Mainclass      mainClassFolder          Mainclass class      packageFolder          IamUselessWithoutMain class

User · Answer

In 7 3 just enable Properties Build Package Copy Dependent Libraries and main class will be added to manifest when building depending on selected target

User · Answer

Brother you don t need to set class path just follow these simple steps  I use Apache NetBeans    Steps    extract the jar file which you want to add in your project   only copy those packages  folder  which you need in the project   do not copy manifest file   open the main project jar file dist file jar  with WinRAR  paste that folder or package in the main project jar file   Those packages work 100  in your project    warning  Do not make any changes in the manifest file    Another method    In my case lib folder present outside the dist main jar file  folder   we need to move lib folder in dist folder then we set class path from  manifest mf file of main jar file   Edit the manifest mf And ADD this type of line  Class-Path  lib foldername jarfilename jar lib foldername jarfilename jar    Warning  lib folder must be inside the dist folder otherwise jar file do not access your lib folder jar files

User · Answer

This is a problem still as of 7 2 1    Create a library cause you do not know what it will do if you make it an application  amp  you are screwed   Did find how to fix this though   Edit nbproject project properties  change the following line to false as shown   mkdist disabled false  After this you can change the main class in properties and it will be reflected in manifest

User · Answer

It is simple     Right click on the project Go to Properties Go to Run in Categories tree Set the Main Class in the right side panel  Build the project   Thats it  Hope this helps

User · Answer

I read and read and read to figure out why I was getting a class not found error  it turns out the manifest mf  had an error in the line    Main-Class  com example MainClass   I fixed the error by going to Project Properties dialog  right-click Project Files   then Run and Main Class and corrected whatever Netbeans decided to put here  Netbean inserted the project name instead of the class name  No idea why  Probably inebriated on muratina

[java] How to setup Main class in manifest file in jar produced by NetBeans project

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