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POWhy do I always get this exception?
 

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  1. POWhy do I always get this exception?
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    <p>I developed an app with a GUI, with buttons, relative actionListeners, and exceptions. Today I had this problem. In an <code>actionEvent</code> relative to a button of my GUI, I inserted this code, with some <code>JOptionPane.showInputDialog</code>:</p> <pre><code>public void actionPerformed(ActionEvent ae){ if(ae.getSource()==b1){ try{//FIRST `JOptionPane.showInputDialog` int load = Integer.parseInt(JOptionPane.showInputDialog(null,"Insert current load value: ")); auto.setCurrentLoad(load); //other `JOptionPane.showInputDialog` int choiceDep = Integer.parseInt(JOptionPane.showInputDialog(null, "Does the truck transport perishable goods? 1: YES 2: NO")); if(choiceDep==1) { //here we have to insert expiration date int day = Integer.parseInt(JOptionPane.showInputDialog(null,"Insert value")); int month = Integer.parseInt(JOptionPane.showInputDialog(null,"Insert value")); int year = Integer.parseInt(JOptionPane.showInputDialog(null,"Insert value")); auto.setPerishable(day,month,year); } else if(choiceDep==2) auto.setNotPerishable(); String choiceAv = JOptionPane.showInputDialog(null, "Available Truck? Yes or no?"); if(choiceAv.equals("Yes")) auto.setAvailable(); else auto.setNotAvailable(); } //the exception catch (Exception e) { System.out.println("Exception!");} } </code></pre> <p>Where <code>setAvailable, setNotAvailable,setPerishable,setCurrentLoad</code> are methods of the external class, with reference <code>auto</code>.</p> <p>When I execute this code, it appears the GUI, then I click on button <code>b1</code>. It appears the first <code>JOptionPane.showInputDialog</code>, to insert a value stored in a <code>int load</code>.</p> <p>I entered a value, but no other <code>JOptionPane.showInputDialog</code> appeared (but there are other input dialog) and I got the exception in the command-line. I noticed that the value inserted in the <code>JOptionPane.showInputDialog</code> is never passed to the line <code>auto.setCurrentLoad(load);</code>. </p> <p>Why does it happen? Never seen this error before. Why do I always get the exception immediately after the first <code>JOptionPane.showInputDialog</code> Maybe the JVM doesn't accept many of this <code>JOptionPane.showInputDialog</code> in the same statement/method? Or maybe(as I think) is a programming error of mine?</p> <p>Thanks for your help. Cheers.</p> <p>EDIT: I forgot to insert the exception I got in the command-line: </p> <pre><code>java.lang.NullPointerException at AutoCom.actionPerformed(AutoCom.java:50) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown So ce) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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    1. USAlberto Solano
    1. USAlberto Solano
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      1. POWhy do I always get this exception?
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      1. VTDownMod
    2. VO
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      1. VTModeratorReview
    1. COWhat exception do you get?
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      1. POWhy do I always get this exception?
      1. USbmargulies
    2. COWhat is the Exception you are getting. You should change your catch block from `System.out.println...` to `e.printStackTrace();`. This will print out the full exception. Please update your post with the stack trace.
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      1. POWhy do I always get this exception?
      1. USRyan Gross
    3. CO@bmargulies This is, appearing in the command-line: System.out.println("Exception!"); After, the other code is not executed..
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      1. POWhy do I always get this exception?
      1. USAlberto Solano
 

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