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java.lang.IllegalStateException: Attempt to mutate in notification	at javax.swing.text.AbstractDocument.writeLock(Unknown Source)	at javax.swing.text.AbstractDocument.insertString(Unknown Source)	at javax.swing.JTextArea.append(Unknown Source)	at UpdateResource$MyDocumentListener.updateLog(UpdateResource.java:191)	at UpdateResource$MyDocumentListener.insertUpdate(UpdateResource.java:176)	at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)	at javax.swing.text.AbstractDocument.insertString(Unknown Source)	at javax.swing.text.JTextComponent.replaceSelection(Unknown Source)	at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(Unknown Source)