JTextArea.setText("String ") not updating the GUI.

Question

Hi,
When i tried to update the JTextArea with a new String it is not replacing the string in the TextArea.
If I try to print the content by retrieving the data in the TextArea using JTextArea.getText() it is showing the latest string set to the JTextArea.
What might be the problem?
DP

Answer 1

Here is the code. I am calling the displayMessage() from onMessage() method.
private void displayMessage(String str){
     textArea.setText(str);
     textArea.revalidate();
     System.out.println("Message Received from QUE: "+ textArea.getText());
public void onMessage(Message msg) {
try {
if (msg instanceof TextMessage) {
     msgText = ((TextMessage)msg).getText();
} else {
     msgText = msg.toString();
     msgText = msgText.trim();
System.out.println(msgText );
displayMessage(msgText);