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POCould not open external file from jar file when it is executed from different location
 

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    <p>I have a java application that have "Help" button. When i click the button it opens index.html in default browser.</p> <pre><code>import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.*; public class help { private static JButton jButton1; private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("HelloWorldSwing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add button jButton1 = new javax.swing.JButton("help"); // button action jButton1.addActionListener( new ActionListener() { @Override public void actionPerformed( ActionEvent ae ) { try { File directory = new File ("."); File html= new File("helpFile"+File.separator+"index.html"); java.awt.Desktop.getDesktop().open(html); } catch (IOException ex) {Logger.getLogger(help.class.getName()).log(Level.SEVERE, null, ex);} } }); frame.getContentPane().add(jButton1); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } </code></pre> <p>It works properly when i execute</p> <pre><code>java help </code></pre> <p>I packed it into <em>a.jar</em> file and it also works</p> <pre><code>java -jar a.jar </code></pre> <p>However, if i get out of the directory that contains <em>a.jar</em> file, it could not find <em>index.html</em> while clicking the button.</p> <p>Terminal output</p> <pre><code>[world@localhost Help]$ cd .. [world@localhost Desktop]$ java -jar Help/a.jar Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: The file: helpFile/index.html doesn't exist. at java.awt.Desktop.checkFileValidation(Desktop.java:209) at java.awt.Desktop.open(Desktop.java:270) at help$1.actionPerformed(help.java:36) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253) at java.awt.Component.processMouseEvent(Component.java:6203) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:5968) at java.awt.Container.processEvent(Container.java:2105) at java.awt.Component.dispatchEventImpl(Component.java:4564) at java.awt.Container.dispatchEventImpl(Container.java:2163) at java.awt.Component.dispatchEvent(Component.java:4390) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055) at java.awt.Container.dispatchEventImpl(Container.java:2149) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4390) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649) at java.awt.EventQueue.access$000(EventQueue.java:96) at java.awt.EventQueue$1.run(EventQueue.java:608) at java.awt.EventQueue$1.run(EventQueue.java:606) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116) at java.awt.EventQueue$2.run(EventQueue.java:622) at java.awt.EventQueue$2.run(EventQueue.java:620) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.awt.EventQueue.dispatchEvent(EventQueue.java:619) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177) at java.awt.EventDispatchThread.run(EventDispatchThread.java:138) </code></pre>
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