Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Question

sharvil_maniyar

11 Years Ago

run:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.sun.java.swing.plaf.nimbus.NimbusStyle.init(NimbusStyle.java:418)
at com.sun.java.swing.plaf.nimbus.NimbusStyle.validate(NimbusStyle.java:359)
at com.sun.java.swing.plaf.nimbus.NimbusStyle.getValues(NimbusStyle.java:927)
at com.sun.java.swing.plaf.nimbus.NimbusStyle.getInsets(NimbusStyle.java:605)
at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:896)
at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.java:275)
at javax.swing.plaf.synth.SynthLabelUI.updateStyle(SynthLabelUI.java:53)
at javax.swing.plaf.synth.SynthLabelUI.propertyChange(SynthLabelUI.java:232)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
at java.awt.Component.firePropertyChange(Component.java:8128)
at java.awt.Component.setName(Component.java:935)
at javax.swing.plaf.synth.SynthComboBoxUI$SynthComboBoxRenderer.getListCellRendererComponent(SynthComboBoxUI.java:409)
at javax.swing.plaf.basic.BasicComboBoxUI.getDisplaySize(BasicComboBoxUI.java:1334)
at javax.swing.plaf.basic.BasicComboBoxUI.getMinimumSize(BasicComboBoxUI.java:903)
at javax.swing.plaf.basic.BasicComboBoxUI.getPreferredSize(BasicComboBoxUI.java:892)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedPreferredSize(GroupLayout.java:2944)
at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedMinimumSize(GroupLayout.java:2930)
at javax.swing.GroupLayout$ComponentSpring.calculateMinimumSize(GroupLayout.java:2897)
at javax.swing.GroupLayout$Spring.getMinimumSize(GroupLayout.java:1315)
at javax.swing.GroupLayout$ComponentSpring.calculatePreferredSize(GroupLayout.java:2904)
at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
at javax.swing.GroupLayout$ComponentSpring.getBaseline(GroupLayout.java:2998)
at javax.swing.GroupLayout$BaselineGroup.calculateBaselineAndResizeBehavior(GroupLayout.java:2657)
at javax.swing.GroupLayout$BaselineGroup.calculateSize(GroupLayout.java:2633)
at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1593)
at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588)
at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588)
at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
at javax.swing.GroupLayout$SequentialGroup.setValidSize(GroupLayout.java:1972)
at javax.swing.GroupLayout$Group.setSize(GroupLayout.java:1553)
at javax.swing.GroupLayout.calculateAutopadding(GroupLayout.java:1058)
at javax.swing.GroupLayout.layoutContainer(GroupLayout.java:899)
at java.awt.Container.layout(Container.java:1421)
at java.awt.Container.doLayout(Container.java:1410)
at java.awt.Container.validateTree(Container.java:1507)
at java.awt.Container.validateTree(Container.java:1513)
at java.awt.Container.validateTree(Container.java:1513)
at java.awt.Container.validateTree(Container.java:1513)
at java.awt.Container.validate(Container.java:1480)
at java.awt.Window.show(Window.java:861)
at java.awt.Component.show(Component.java:1563)
at java.awt.Component.setVisible(Component.java:1515)
at java.awt.Window.setVisible(Window.java:842)
at inventory.RemoveSupplier$3.run(RemoveSupplier.java:203)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
BUILD STOPPED (total time: 12 seconds)

java jcombobox nullpointerexception

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11 Replies
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Latest Post 11 Years Ago Latest Post by JamesCherrill

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NormR1 563 Posting Sage

11 Years Ago

I'd add a call to printStackTrace to the catch block line 43 to show the full text of the error message.

dantinkakkar commented: Yup, that'll give a clearer idea about the exception. *AGREE* +4

DavidKroukamp 105 Master Poster

11 Years Ago

Thanks for taking time and replying NormR1..
But actually the stupidest thing happed with this code..
I just changed the JDK from 1.6 to 1.7 and then tried this code and it worked with no errors...
And since, all other are working flawlessly...

I think thats because the Nimbus style is only supported by JDK 7... So running that code on a JDK 6/jre 6 will throw an error

JamesCherrill 4,733 Most Valuable Poster

11 Years Ago

Yes, Nimbus was new from 1.6 update 10 to be precise

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Yup, that'll give a clearer idea about the exception. *AGREE*

sharvil_maniyar · Answer 1 · 2012-02-25T16:21:49+00:00

THIS IS THE CODE

java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * RemoveSupplier.java
 *
 * Created on Feb 16, 2012, 11:09:24 AM
 */
package inventory;

import java.sql.*;
import javax.swing.JOptionPane;

/**
 *
 * @author Administrator
 */
public class RemoveSupplier extends javax.swing.JFrame {

    Connection con;
    Statement stmt1;
    ResultSet rs1;

    /** Creates new form RemoveSupplier */
    public RemoveSupplier() {
        initComponents();
        try {
            con = new database().connect();
            stmt1 = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);

            rs1 = stmt1.executeQuery("SELECT SName FROM SupplierData ORDER BY ID");
            while (rs1.next()) {
                supSelect.addItem(rs1.getString(1));
            }
            rs1.close();

            con.close();

        } catch (Exception e) {
            JOptionPane.showMessageDialog(this, e.toString());
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        supDel = new javax.swing.JButton();
        supCan = new javax.swing.JButton();
        supSelect = new javax.swing.JComboBox();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setName("Form"); // NOI18N

        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(inventory.InventoryApp.class).getContext().getResourceMap(RemoveSupplier.class);
        jLabel1.setFont(resourceMap.getFont("jLabel1.font")); // NOI18N
        jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
        jLabel1.setName("jLabel1"); // NOI18N

        supDel.setFont(resourceMap.getFont("supCan.font")); // NOI18N
        supDel.setText(resourceMap.getString("supDel.text")); // NOI18N
        supDel.setName("supDel"); // NOI18N
        supDel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                supDelActionPerformed(evt);
            }
        });

        supCan.setFont(resourceMap.getFont("supCan.font")); // NOI18N
        supCan.setText(resourceMap.getString("supCan.text")); // NOI18N
        supCan.setName("supCan"); // NOI18N
        supCan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                supCanActionPerformed(evt);
            }
        });

        supSelect.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Select Here" }));
        supSelect.setName("supSelect"); // NOI18N

        jLabel2.setFont(resourceMap.getFont("jLabel2.font")); // NOI18N
        jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
        jLabel2.setName("jLabel2"); // NOI18N

        jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
        jLabel3.setName("jLabel3"); // NOI18N

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(123, 123, 123)
                        .addComponent(supDel)
                        .addGap(119, 119, 119)
                        .addComponent(supCan)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 99, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addGap(59, 59, 59))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(21, 21, 21)
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 57, Short.MAX_VALUE)
                        .addComponent(supSelect, javax.swing.GroupLayout.PREFERRED_SIZE, 245, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(43, 43, 43))
                    .addComponent(jLabel1))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 34, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(supSelect, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addGap(31, 31, 31)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(supDel)
                    .addComponent(supCan))
                .addGap(18, 18, 18)
                .addComponent(jLabel3)
                .addContainerGap())
        );

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-530)/2, (screenSize.height-275)/2, 530, 275);
    }// </editor-fold>                        

private void supDelActionPerformed(java.awt.event.ActionEvent evt) {                                       
    try {
        con = new database().connect();
        String delItem = (String) supSelect.getSelectedItem();
        PreparedStatement ps1 = con.prepareStatement("delete from SupplierData where SName='" + delItem + "'");
        int i = ps1.executeUpdate();
        if (i == 1) {
            JOptionPane.showMessageDialog(this, "Deleted");
        }

    } catch (Exception e) {
        JOptionPane.showMessageDialog(this, e.toString());
    }
    this.dispose();

}                                      

private void supCanActionPerformed(java.awt.event.ActionEvent evt) {                                       
    int conf = JOptionPane.showConfirmDialog(this, "Are you sure ?");
    if (conf == 0) {
        this.dispose();
    } else {
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

    }
}                                      

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(RemoveSupplier.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(RemoveSupplier.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(RemoveSupplier.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(RemoveSupplier.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new RemoveSupplier().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JButton supCan;
    private javax.swing.JButton supDel;
    private javax.swing.JComboBox supSelect;
    // End of variables declaration                   
}

sharvil_maniyar · Answer 2 · 2012-02-26T00:44:57+00:00

Thanks for taking time and replying NormR1..

But actually the stupidest thing happed with this code..

I just changed the JDK from 1.6 to 1.7 and then tried this code and it worked with no errors...

And since, all other are working flawlessly...

sharvil_maniyar · Answer 3 · 2012-02-26T14:06:52+00:00

but thats is the other problem...
i never selected NIMBUS !!!
m coding in windows xp as such but i displays some code as nimbus and some as XP

JamesCherrill 4,733 Most Valuable Poster Team Colleague Featured Poster · Answer 4 · 2012-02-26T14:33:30+00:00

Read lines 178 onwards in the code you posted. That's where your program explicitly selects Nimbus.
Yet another good example of why an IDE is dangerous for less experienced users - you probably didn't know that your IDE did that behind your back.

sharvil_maniyar · Answer 5 · 2012-02-26T14:38:12+00:00

i know it is doing that .. i tried to change it.. its not happening..
can u suggest me steps or something..

JamesCherrill 4,733 Most Valuable Poster Team Colleague Featured Poster · Answer 6 · 2012-02-26T15:21:44+00:00

"i never selected NIMBUS !!!"
"i know it is doing that "
make your mind up.

"i tried to change it.. its not happening" - change what to what exactly? How can anyone possibly comment on some change that you don't tell us about.

"can u suggest me steps or something." Yes - think about what you are posting and give accurate, consistent and most of all complete info to those who are trying to help you.

sharvil_maniyar · Answer 7 · 2012-02-26T15:38:23+00:00

I m sorry to confuse u sir.
looking at the code i know it is automatically selecting Nimbus..
all i want to know is ..
how can i change it....

JamesCherrill 4,733 Most Valuable Poster Team Colleague Featured Poster · Answer 8 · 2012-02-26T15:41:43+00:00

That code was generated by your IDE, so you'll need to look in the IDE for the option to set the L&F. You could just delete that block of code, but your IDE will probably recreate it next time unless you change the option in your IDE.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

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