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POCreating a workable jar
 

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    <p>Ok, this is round two of my problem. I have created a simple program in notepad and saved it as a (Blocktestgui.java)java file. I compile with the command javac Blocktestgui.java and get (Blocktestgui.class) I created a text manifest file (see below) and saved it as manifest.mf I then run the command <code>jar cvf bg.jar Blocktestgui.class manifest.mf</code> and get (bg.jar)</p> <p>This is my java file:</p> <pre><code>import javax.swing.JOptionPane; public class Blocktestgui { public static void main(String[] args) { String firstNumber, secondNumber; double number1, number2, sum; firstNumber=JOptionPane.showInputDialog ("Enter wall length in decimal feet:",JOptionPane.INFORMATION_MESSAGE); secondNumber=JOptionPane.showInputDialog ("Enter wall height in decimal feet:",JOptionPane.INFORMATION_MESSAGE); number1=Double.parseDouble (firstNumber); number2=Double.parseDouble (secondNumber); sum = (number1*number2) / 0.88; JOptionPane.showMessageDialog (null, "Total Blocks are " + sum,"Results",JOptionPane.PLAIN_MESSAGE); System.exit (0); } } </code></pre> <p>This is my manifest.mf before creating the jar:</p> <pre><code>Main-Class: Blocktestgui </code></pre> <p>When I extract the contents of the jar I get a folder and two files</p> <p><strong>Folder>--META-INF &lt;--contains MANIFEST.MF&lt;-- This file does not contain the line Main-Class: Blocktestgui</strong></p> <p><strong>File>--Blocktestgui.class</strong></p> <p><strong>File>--manifest.mf&lt;--All this file says is Main-Class: Blocktestgui</strong></p> <pre><code>TestFolder/ |- META-INF/ |- MANIFEST.MF (This file does not contain the line Main-Class: Blocktestgui) |- Blocktestgui.class |- manifest.mf (This file says is Main-Class: Blocktestgui) </code></pre> <p>When I run the jar file in console with java -jar bg.jar it gives me an error of "no main manifest attribute, in bg.jar"</p> <p>What am I messing up on ?</p>
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