/*Error:Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at LansinTVserver.CheckStatus.CheckDetails(CheckStatus.java:26) at LansinTVserver.MainFrame$2.run(MainFrame.java:152) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)*/public class MainFrame extends javax.swing.JFrame {... public void Set_jTextArea_Status (String TextToAppend) { jTextArea_Status.append(TextToAppend); } public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { MainFrame a = new MainFrame(); CheckStatus b = new CheckStatus(a); b.CheckDetails(); a.setVisible(true); } }); }...}public class CheckStatus { MainFrame a; public CheckStatus(MainFrame a) { } public void CheckDetails() { a.Set_jTextArea_Status("CheckVersionjhgh"); } public String CheckVersion() { return "LansinTVserver v4.01"; }}