// Constructor for inputstream
public SimulatorInput ( JTextField inputField, JButton ... buttons ) {
    this.inputField = inputField ;
    this.byteStream = ByteBuffer.allocate ( BUFFERSIZE ) ;
  }

// Adds the chars to the buffer
public void post ( ) {
    synchronized ( this.byteStream ) {
      this.byteStream.put ( ( this.inputField.getText ( ) + "\r\n" ).getBytes ( ) ) ;
      this.inputField.setText ( "" ) ;
      this.byteStream.notifyAll ( ) ;
    }
  }

//read...
  @Override public int read ( ) throws IOException {
    synchronized ( this.byteStream ) {
      while ( !this.byteStream.hasRemaining ( ) ) {
        try {
          this.byteStream.wait ( ) ;
        } catch ( InterruptedException e ) {
          throw new IOException ( e ) ;
        }
      }
      return this.byteStream.get ( ) ;
    }
  }

//the error
Exception in thread "AWT-EventQueue-0" java.nio.BufferOverflowException
	at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:165)
	at java.nio.ByteBuffer.put(ByteBuffer.java:813)
	at simulator.gui.SimulatorInput.post(SimulatorInput.java:44)
	at simulator.gui.SimulatorConsole$Listener.keyTyped(SimulatorConsole.java:60)
	at java.awt.Component.processKeyEvent(Component.java:5993)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2799)
	at java.awt.Component.processEvent(Component.java:5815)
	at java.awt.Container.processEvent(Container.java:2058)
	at java.awt.Component.dispatchEventImpl(Component.java:4410)
	at java.awt.Container.dispatchEventImpl(Container.java:2116)
	at java.awt.Component.dispatchEvent(Component.java:4240)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
	at java.awt.Component.dispatchEventImpl(Component.java:4282)
	at java.awt.Container.dispatchEventImpl(Container.java:2116)
	at java.awt.Window.dispatchEventImpl(Window.java:2429)
	at java.awt.Component.dispatchEvent(Component.java:4240)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)