java.lang.IndexOutOfBoundsException: Index: 3, Size: 3

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Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range. Applications can subclass this class to indicate similar exceptions.

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Thrown if trying to access an index which is out of bounds on objects like String, Array, or Vector. Any negative integer less than or equal to -1 and positive integer greater than or equal to the size of the object is an index which would be out of bounds

java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at java.awt.Container.createHierarchyEvents(Container.java:1441)
at java.awt.Container.createHierarchyEvents(Container.java:1441)
at java.awt.Container.createHierarchyEvents(Container.java:1441)
at java.awt.Container.createHierarchyEvents(Container.java:1441)
at java.awt.Container.createHierarchyEvents(Container.java:1441)
at java.awt.Dialog.conditionalShow(Dialog.java:953)
at java.awt.Dialog.show(Dialog.java:1037)
at java.awt.Component.show(Component.java:1671)
at java.awt.Component.setVisible(Component.java:1623)
at java.awt.Window.setVisible(Window.java:1014)
at java.awt.Dialog.setVisible(Dialog.java:1005)
at net.sf.jabref.gui.importer.fetcher.GeneralFetcher.lambda$actionPerformed$5(GeneralFetcher.java:220)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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