Creating an Executable jar File
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In Java, it is common to combine several classes in one .jar ("java archive") file. Library classes are stored that way. Larger projects (such as the Case Study in the AP program) use jar files. You can create your own jar file combining several classes, too.
jar files are created using the jar.exe
utility program from JDK. You can make your jar file runnable by telling jar.exe
which class has main
. To do that, you first need to create a manifest file. A manifest is a one-line text file with a "Main-Class" directive. For example:
Main-Class: DanceStudio
This line must end with a newline.
A jar file created with a main class manifest can be used both as a library and a runnable jar. If you use it as a library, you can edit and compile any of the classes included in the jar, and add it to your project. Then it will override the one in the jar file.
You can create a manifest file in any text editor, or even by using the MS-DOSecho
command. You can give your manifest file any name, but it’s better to use something standard, such as manifest.txt
.
Once you have a manifest and all your classes have been compiled, you need to run JDK’s jar.exe
utility. It is located in the JDK’s bin
folder, the same place where javac.exe
and java.exe
. are. jar.exe
takes command-line arguments; if you run it without any arguments, it will display the usage information and examples. You need
C\mywork> jar cvfm MyJarName.jar manifest.txt *.class
cvfm
means "create a jar; show verbose output; specify the output jar file name; specify the manifest file name." This is followed by the name you wish to give to your jar file, the name of your manifest file, and the list of .class
files that you want included in the jar. *.class
means all class files in the current directory.
Below are the detailed steps for doing this in Command Prompt and in JCreator.
Creating a jar File in JCreator
You can configure a "tool" that will automate the jar creation process. You only need to do it once.- Click on
Configure/Options
. - Click on
Tools
in the left column. - Click
New
, and chooseCreate Jar file
. - Click on the newly created entry
Create Jar File
in the left column underTools
. - Edit the middle line labeled
Arguments:
it should havecvfm $[PrjName].jar manifest.txt *.class
- Click OK.
Now set up a project for your program, create a manifest file manifest.txt
or copy and edit an existing one. Place manifest.txt
in the same folder where the.class
files go. Under View/Toolbars
check the Tools
toolbar. Click on the corresponding tool button or press Ctrl-1
(or Ctrl-n
if this is the n-th tool) to run the Create Jar File
tool.
With Windows Explorer, go to the jar file that you just created and double click on it to run.
Creating a jar File in Command Prompt
- Start Command Prompt.
- Navigate to the folder that holds your class files:
C:\>cd \mywork
- Set path to include JDK’s bin. For example:
C:\mywork> path c:\Program Files\Java\jdk1.5.0_09\bin;%path%
- Compile your class(es):
C:\mywork> javac *.java
- Create a manifest file:
C:\mywork> echo Main-Class: DanceStudio >manifest.txt
- Create a jar file:
C:\mywork> jar cvfm DanceStudio.jar manifest.txt *.class
- Test your jar:
C:\mywork> DanceStudio.jar
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