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POjcombobox as cell editor java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
 

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  1. POjcombobox as cell editor java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
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    <p>I am using a custom JComboBox as a cell editor in a JTable. When the users gets to the cell using keyboard controls it tries to open the popup. This causes the following error:</p> <pre><code>java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:1964) at java.awt.Component.getLocationOnScreen(Component.java:1938) at javax.swing.JPopupMenu.show(JPopupMenu.java:887) at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:191) at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:859) at javax.swing.JComboBox.setPopupVisible(JComboBox.java:796) </code></pre> <p>I have seen some articles stating that this is a known problem and the solution is to set:</p> <pre><code> comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE); </code></pre> <p>This however does not help. What is this supposed to do anyways?</p> <p>All the threads and articles I have read about this are very vague about the nature of the problem. </p> <p>Does anyone have any insight into the nature of why this problem occurs? My combobox is very custom so it would help to understand the basis of the problem so I can fix the code.</p> <p>This is triggered on a focus gained event on the combo box which is captured and call setPopupVisible(true);</p> <pre><code> public void focusGained(java.awt.event.FocusEvent e) { //if focus is gained then make sure we show the popup if it is suppose to be visible setPopupVisible(true); //and highlight the selected text if any comboTextEditor.setCaretPosition(comboTextEditor.getText().length()); comboTextEditor.moveCaretPosition(0); } </code></pre> <p>By the way I get the same results in Java 1.7_40 as Java 1.6_45</p> <p>Full Stack Trace:</p> <pre><code>Exception in thread "AWT-EventQueue-1" java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:1964) at java.awt.Component.getLocationOnScreen(Component.java:1938) at javax.swing.JPopupMenu.show(JPopupMenu.java:887) at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:191) at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:859) at javax.swing.JComboBox.setPopupVisible(JComboBox.java:796) at com.mbs.generic.view.swing.combobox.AutoCompleteComboBox$1.focusGained(AutoCompleteComboBox.java:185) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:203) at java.awt.Component.processFocusEvent(Component.java:6179) at java.awt.Component.processEvent(Component.java:6046) at java.awt.Container.processEvent(Container.java:2039) at java.awt.Component.dispatchEventImpl(Component.java:4653) at java.awt.Container.dispatchEventImpl(Container.java:2097) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:901) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:513) at java.awt.Component.dispatchEventImpl(Component.java:4525) at java.awt.Container.dispatchEventImpl(Container.java:2097) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:607) at java.awt.EventQueue$1.run(EventQueue.java:605) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:621) at java.awt.EventQueue$2.run(EventQueue.java:619) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:618) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) </code></pre> <p>thanks</p>
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    1. COI would post a SSCCE if I could make a short one to reproduce but everything involved is custom. Nevertheless, this problem seems rampant with no clear explanation as why or solution.
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    2. COAre trying to open the combo boxes' popup menu yourself?
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    3. COYes on focus gained I call: setPopupVisible(true);
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