Java - JTabbedPane - ArrayIndexOutOfBoundsException when adding a new panel

Question

I have a weird problem using a JTabbedPane and adding a new tab to it.

public void addTab(String title, AbstractTab tab) {
    int i = tabPanel.getTabCount();
    System.out.println("Tab count:" + i);
    tab.validate();
    tabPanel.insertTab(title, null, tab, title, i);
    tabPanel.validate();
    tabPanel.setSelectedIndex(i);
}

Running this code causes the following exception:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.JTabbedPane.getTitleAt(Unknown Source)
at javax.swing.plaf.basic.BasicTabbedPaneUI$Handler.updateHtmlViews(Unknown Source)
at javax.swing.plaf.basic.BasicTabbedPaneUI$Handler.componentAdded(Unknown Source)
at java.awt.Container.processContainerEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at javax.swing.JTabbedPane.insertTab(Unknown Source)
at View.Swing.Global.**EditorPanel.addTab(EditorPanel.java:383)**
at View.Swing.Developer.DeveloperContentPanel.showNote(DeveloperContentPanel.java:176)
at View.Swing.Developer.DeveloperTreeViewer.clickedTreeElement(DeveloperTreeViewer.java:62)
at View.Swing.Global.TreeNavigation.mouseClicked(TreeNavigation.java:556)
at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
...

The System.out.println(..); prints

Tab count 1

The weird thing is, that this method works once, and another time it throws this exception. The added tabs are instances of the class AbstractTab, containing JTextFields, a MetaphaseEditor, scrollbars, JLabels and JTextAreas and some pictures (ImageIcon).

Does anyone know a solution for this problem?

You may not have enough information here to allow us to give an answer. Consider creating and posting an SSCCE -- a small compilable and runnable program that we can run within need of outside resources and that demonstrates your problem. Also, I think that the word you're looking for is "weird". — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Jan 21, 2012 at 12:21
Why don't you use addTab() and setSelectedComponent()? Then you don't need to care about the index. — Stephan
– Stephan, Commented Jan 21, 2012 at 12:32

Community · Accepted Answer · 2023-11-10 19:48:45Z

2

from Bugtracker, maybe you use a component more than once?

Clarify in documentation that no 2 tabs in a JTabbedPane can have the same component assigned to them.. causes java.lang.ArrayIndexOutOfBoundsException: 1 > 0

edited Nov 10, 2023 at 19:48

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answered Jan 21, 2012 at 12:23

rauschen

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1 Comment

kleopatra Over a year ago

+1 for the good idea :-) though when doing so, the actual stacktrace is a bit different from the one shown above (IndexOOB in JTabbedPane.checkIndex)

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