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POJTextArea not displaying text
 

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    <p>In my function for displaying text in textarea,i have written following lines of code but it is not displaying any text</p> <pre><code> jTextArea1.setText( Packet +"\n" +jTextArea1.getText()); </code></pre> <p>I am using swingworker for performing background task,here is my code</p> <pre><code>public class SaveTraffic extends SwingWorker&lt;Void, Void&gt; { public GUI f = new GUI(); @Override public Void doInBackground() throws IOException { //some code sendPacket(captor.getPacket().toString()); return null; }//end main function @Override public void done() { System.out.println("I am DONE"); } public void sendPacket(String Packet) { f.showPackets(Packet); } </code></pre> <p>}</p> <p>and the following lines of code i have written in my GUI form</p> <pre><code> public void showPackets(String Packet) { jTextArea1.append( Packet); } </code></pre> <p>Solution: public class SaveTraffic extends SwingWorker {</p> <pre><code> public GUI f = new GUI(); @Override public Void doInBackground() throws IOException { f.add(jTextPane1); // some code publish(captor.getPacket().toString()); // the method below is calling sendPacket on the background thread // which then calls showPackets on the background thread // which then appends text into the JTextArea on the background thread //sendPacket(captor.getPacket().toString()); return null; } @Override protected void process(List&lt;String&gt; chunks) { for (String text : chunks) { jTextPane1.setText(text); f.showPackets(text); } } @Override public void done() { System.out.println("I am DONE"); } </code></pre> <p>}</p>
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    1. COIt seems that longer code snippet may be helpful.
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    2. COPlease give us more information -- enough so that we don't have to all guess.
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    3. COIn your new code, is your `sendPacket(...)` method call supposed to be `showPackets(...)`? If not, where do you call `showPackets(...)`? You know that `sendPacket(...)` is being called from within your background thread, and if that is where you're trying to write to your JTextArea, then yep, you've got a concurrency issue.
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