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POJOptionPane gives an error
 

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    <p>I want to handle some exceptions using <code>JOptionPane</code>s. This is the main method:</p> <pre><code>public class MainRun { public static void main(String args[]){ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { try { UIManager.setLookAndFeel(new SubstanceRavenGraphiteGlassLookAndFeel()); }catch (Exception e){ e.printStackTrace(); } new MainGui().setVisible(true); new Initialized().start(); new PriorityMessageQueue().start(); } }); </code></pre> <p><code>MainGui</code> is the main window (<code>JFrame</code>) of the application. I handled exception inside the <code>PriorityMessageQueue</code> thread.</p> <pre><code>public class PriorityMessageQueue extends Thread { @Override public void run() { while (true) { try { instantMessages = instant.getMobitelMessagesToBeSent(); } catch (Exception ex) { JOptionPane.showMessageDialog( null, ex.getMessage(), "Database Error", JOptionPane.ERROR_MESSAGE); } ... </code></pre> <p>after I run this, I'm getting an error</p> <pre><code> org.jvnet.substance.api.UiThreadingViolationException: Component creation must be done on Event Dispatch Thread at org.jvnet.substance.utils.SubstanceCoreUtilities.testComponentCreationThreadingViolation(SubstanceCoreUtilities.java:2312) at org.jvnet.substance.SubstanceOptionPaneUI.createUI(SubstanceOptionPaneUI.java:83) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:37) at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:244) at javax.swing.UIDefaults.getUI(UIDefaults.java:752) at javax.swing.UIManager.getUI(UIManager.java:989) at javax.swing.JOptionPane.updateUI(JOptionPane.java:1859) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1822) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1785) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1753) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1731) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1711) at GUI.MainGui.showOptionPane(MainGui.java:1039) at SMS.PriorityMessageQueue.run(PriorityMessageQueue.java:86) UIDefaults.getUI() failed: createUI() failed for javax.swing.JOptionPane [,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=,p referredSize=,icon=,initialValue=,message=DatabaseConnection class connect,messageType=ERROR_MESSAGE,optionType=DEFAULT_OPTION,wantsInput=false] java.lang.reflect.InvocationTargetException java.lang.Error at javax.swing.UIDefaults.getUIError(UIDefaults.java:712) at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:133) at javax.swing.UIDefaults.getUI(UIDefaults.java:758) at javax.swing.UIManager.getUI(UIManager.java:989) at javax.swing.JOptionPane.updateUI(JOptionPane.java:1859) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1822) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1785) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1753) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1731) at javax.swing.JOptionPane.&lt;init&gt;(JOptionPane.java:1711) at GUI.MainGui.showOptionPane(MainGui.java:1039) at SMS.PriorityMessageQueue.run(PriorityMessageQueue.java:86) </code></pre> <p>And the <code>JOptionPane</code> will not display properly!</p> <p><img src="https://i.stack.imgur.com/3aFZj.jpg" alt="enter image description here"></p> <p>Instead of passing <code>null</code> to <code>JOptionPane</code>, how can I get the parentComponent (<code>MainGui</code> <code>JFrame</code>)?</p>
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