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  1. JDK
  2. JDK-8234423

Modifying ArrayList.subList().subList() resets modCount of subList

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        When a sublist of a sublist is created, its modCount is copied from the root ArrayList, not the immediate parent.
        This means that modifying that 2nd-level sublist will reset the modCount of its parent, so it won't detect concurrent modifications to the root.

        Similar issue is happening with the sublist's iterator: When an iterator for an ArrayList.SubList is created, its expectedModCount is set to root.modCount (i.e. the modCount of the ArrayList), while it would be more accurate to set it to SubList.this.modCount (i.e. the modCount of the SubList).
        With the current implementation, if the root ArrayList is modified immediately before creating the SubList.iterator not via this SubList, the iterator will fail to detect the concurrent modification.

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8236895 Modifying ArrayList.subList().subList() resets modCount of subList

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8236896 Modifying ArrayList.subList().subList() resets modCount of subList

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8237518 Modifying ArrayList.subList().subList() resets modCount of subList

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8238137 Modifying ArrayList.subList().subList() resets modCount of subList

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8246764 Modifying ArrayList.subList().subList() resets modCount of subList

            • P3 - Major loss of function.
            • Resolved
            relates to

            Enhancement - null JDK-8079136 Accessing a nested sublist leads to StackOverflowError

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            links to

            Web Link Review request at core-libs-dev alias

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                igerasim Ivan Gerasimov
                igerasim Ivan Gerasimov
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