| CTRL-C stack overflow [message #572917] |
Wed, 10 October 2007 17:35 |
 James Peltzer
Messages: 43
Registered: July 2009 |
Member |
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I have noticed an interesting problem when you are using a Swing editor.
In a text field in the editor, hit CTRL-C. Open another editor. Watch the
stack overflow errors pile up.
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at java.util.Arrays.mergeSort(Arrays.java:1270)
at java.util.Arrays.sort(Arrays.java:1210)
at java.util.Collections.sort(Collections.java:159)
at
javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycl e(SortingFocusTr
aversalPolicy.java:119)
at
javax.swing.SortingFocusTraversalPolicy.getFirstComponent(So rtingFocusTraver
salPolicy.java:434)
at
javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(Lay outFocusTraversa
lPolicy.java:148)
at
javax.swing.DefaultFocusManager.getFirstComponent(DefaultFoc usManager.java:9
9)
at
javax.swing.LegacyGlueFocusTraversalPolicy.getFirstComponent (LegacyGlueFocus
TraversalPolicy.java:115)
at
javax.swing.LegacyGlueFocusTraversalPolicy.getDefaultCompone nt(LegacyGlueFoc
usTraversalPolicy.java:133)
at
javax.swing.SortingFocusTraversalPolicy.getFirstComponent(So rtingFocusTraver
salPolicy.java:447)
...
I was able to fix this by moving the focus policy from the frame down to the
JApplet. I notice your article code says to 'consider' this in its
comments, is there any reason why you didn't do it?
-James
Modified code (inside addRootPaneContainer):
...
JApplet applet = new JApplet();
// In JRE 1.4, the JApplet makes itself a focus cycle root. This
// interferes with the focus handling installed on the parent frame,
so
// change it back to a non-root here.
// TODO: consider moving the focus policy from the Frame down to the
JApplet
EmbeddedChildFocusTraversalPolicy policy = new
EmbeddedChildFocusTraversalPolicy(awtHandler);
applet.setFocusTraversalPolicy(policy);
frame.add(applet);
return applet;
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