How to create executable jar in Java by Eclipse?

How to create executable jar in Java?



Following are the step for creating executable jar file in java:
Step: Software environments:
JDK
Eclipse

Step: crate java project in Eclipse
Open the Eclipse
File > New > Java Project
Enter the:
Project name: Jar-Creation-In-Java-TutorialByExample
Select the JRE
JavaSE-1.7
Click on the
Next
Finish.



Step: Add ExecutableJarCreationInJava.java in Jar-Creation-In-Java-TutorialByExample
Right click on the src folder under Jar-Creation-In-Java-TutorialByExample
Click on the
New
Class
Enter the package name: com.tutorialbyexample
Enter the Name: ExecutableJarCreationInJava

Click on the Finish.

Step: ExecutableJarCreationInJava.java

package com.tutorialbyexample;

/*
 * Main for for Executable Jar Creation In Java process
 */
public class ExecutableJarCreationInJava {

 public void getDetails(Object object) {

  printLn(object);

 }

 /*
  * private method for print info on console
  */
 private void printLn(Object object) {
  System.out.println(object);
 }

}

Step: Add MainApp.java in Jar-Creation-In-Java-TutorialByExample
Right click on the src folder under Jar-Creation-In-Java-TutorialByExample
Click on the
New
Class
Enter the package name: com.tutorialbyexample
Enter the Name: MainApp
Click on the Finish.

Step: MainApp.java

package com.tutorialbyexample;

/*
 * Main for for Executable Jar Creation In Java process
 */
public class MainApp {

 /*
  * main method for Main App
  */
 public static void main(String[] args) {
  ExecutableJarCreationInJava objJarInJava = 
                     new ExecutableJarCreationInJava();
  objJarInJava
                .getDetails("Jar file creation done in Java by Eclipse!!!");
 }

}

Step: Run it in Eclipse for simple output
Right click on the MainApp.java
Run As
Java Application
Console: Jar file creation done in Java by Eclipse!!!

Step: Create the executable jar file mainapp.jar in Eclipse
Right click on Jar-Creation-In-Java-TutorialByExample
Click on the Export
Type the Jar and Click on the Runnable JAR file from wizard
Click on the Next
Select project name under Lunch Configuration: Jar-Creation-In-Java-TutorialByExample
Export destination: C:\mainapp.jar
Let it be rest default setting
Click Finish.

mainapp.jar will create in C:\mainapp.jar.

Step: Directory structure for mainapp.jar
If you have 7-zip, just right click on the mainapp.jar and extract it.

mainaap
--com
   -- tutorialbyexample
       -- ExecutableJarCreationInJava.class
       -- MainApp.class 
--META-INF
  -- MANIFEST.MF




Step: MANIFEST.MF file details
Manifest-Version: 1.0
Class-Path: .
Main-Class: com.tutorialbyexample.MainApp

Note: With help of this only jar file converted into executable.

Step: Run the executable jar mainapp.jar form command line.
Open the command prompt
Start > Type cmd and press Enter
Command prompt window will appear
Change the dir to c:\ as our mainapp.jar file are located under this dir.

Type the command java and enter

c:\>java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32          use a 32-bit data model if available
    -d64          use a 64-bit data model if available
    -client       to select the "client" VM
    -server       to select the "server" VM
    -hotspot      is a synonym for the "client" VM  [deprecated]
                  The default VM is client.

    -cp 
    -classpath 
                  A ; separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D=
                  set a system property
    -verbose:[class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:...|:]
    -enableassertions[:...|:]
                  enable assertions with specified granularity
    -da[:...|:]
    -disableassertions[:...|:]
                  disable assertions with specified granularity
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:[=]
                  load native agent library , e.g. -agentlib:hprof
                  see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:[=]
                  load native agent library by full pathname
    -javaagent:[=]
                  load Java programming language agent, see java.lang.instrument
    -splash:
                  show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

Indicate that java home has been set if not then set the java home.

Output:

c:\>java -jar mainapp.jar MainApp

Jar file creation done in Java by Eclipse!!!

Thanks for reading, please like and share!!!

Reference:
Java 1.7 by Oracle
Eclipse

Video:


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