How do I make a JAR from a java file

Question

I was writing a simple program using a Java application  not application that has projects  but application within a project   java  that has a single frame  Both of the files are  java so I can t write a manifest needed by the JAR  The MyApp java starts like a class with package  imports then public class MyApp and has a main function  but it s still  java file  I m writing it in JDeveloper 11g if it helps  Any ideas how to make a JAR from these files

User · Answer

Open a command prompt   Go to the directory where you have your  java files  Create a directory build  Run java compilation from the command line  javac -d   build   java   if there are no errors  in the build directory you should have your class tree  move to the build directory and do a   jar cvf YourJar jar     For adding manifest check jar command line switches

User · Answer

Perhaps the most beginner-friendly way to compile a JAR from your Java code is to use an IDE  integrated development environment  essentially just user-friendly software for development  like Netbeans or Eclipse    Install and set-up an IDE  Here is the latest version of Eclipse  Create a project in your IDE and put your Java files inside of the project folder  Select the project in the IDE and export the project as a JAR  Double check that the appropriate java files are selected when exporting    You can always do this all very easily with the command line  Make sure that you are in the same directory as the files targeted before executing a command such as this   javac YourApp java jar -cf YourJar jar YourApp class      changing  YourApp  and  YourJar  to the proper names of your files  respectively

User · Answer

Simply with command line   javac MyApp java jar -cf myJar jar MyApp class   Sure IDEs avoid using command line terminal

User · Answer

Although it is not recommended method but still it works  7-Zip Software is needed  Procedure to get jar from java files   place all java files in one folder  right click on the folder   now click on Add to archive you will get something like shown below   now just change zip to jar and click on ok

User · Answer

Often you will want to specify a manifest  like so   jar -cvfm myJar jar myManifest txt myApp class   Which reads   create verbose jarFilename manifestFilename   followed by the files you want to include  Verbose means print messages about what it s doing   Note that the name of the manifest file you supply can be anything  as jar will automatically rename it and put it into the right directory within the jar file

User · Answer

This can be done without terminal  directly from IDE  Netbeans  for example    Create a separate project with packages  Create Project - Java - Java Class Library   Put your  java classes there  Build this project  Go to your project folder and find build and dist folders there  Find  jar file in your dist folder  Get your other project and add this  jar file to project libraries  You can now reference classes from this library and its methods directly from code  if import is automatically done for you

User · Answer

Ok this is the solution I would have liked to find  instead here I write it   First create the directory structure corresponding to the package defined for the  java file  if it is my super application create the directory  my  and inside it  super  and inside it the  java file  App java   then from command line      javac -cp  path to lib1 jar  path to lib2 jar path to my super App java   Notice the above will include multiple libraries  if under windows use     to separate multiple files otherwise under GNU Linux use     To create a jar file     jar -cvfe App jar App my app    the above will create the application with its corresponding Manifest indicating the App as the main class   Including the required libraries inside the jar file is not possible using java or jar command line parameters   You can instead    manually extract libraries to the root folder of the jar file use an IDE such as Netbeans and insert a rule inside post-jar section of  nbproject build-impl xml to extract the libraries inside the jar  See below      lt target name  -post-jar  gt           lt  -- Empty placeholder for easier customization  -- gt           lt  -- You can override this target in the    build xml file  -- gt     lt jar jarfile    dist jar   update  true  gt                 lt zipfileset src    dist jar   includes       class    gt                 lt zipfileset src    file reference iText-1 0 8 jar   includes         gt         lt zipfileset src    file reference itextpdf-3 2 1 jar   includes         gt     lt  jar gt       lt  target gt     the file reference names are found inside project properties file after you added the libraries to the Netbeans IDE

User · Answer

Here is another fancy way of doing this     ls   grep  java   xargs -I    javac      jar -cf myJar jar   class   Which will grab all the  java files   ls   grep  java   from your current directory and compile them into  class  xargs -I    javac     and then create the jar file from the previously compiled classes  jar -cf myJar jar   class

[java] How do I make a JAR from a .java file?

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