https://issues.apache.org/bugzilla/show_bug.cgi?id=48202
Summary: CellRangeUtil.mergeCellRanges() causes
UnsupportedOperationException due to modifying a
read-only list
Product: POI
Version: 3.5-FINAL
Platform: PC
OS/Version: Windows Vista
Status: NEW
Severity: normal
Priority: P2
Component: HSSF
AssignedTo: [email protected]
ReportedBy: [email protected]
Steps to reproduce:
- create an array of CellRangeAddress objects, where at least two are direct
neighbours.
- call CellRangeUtil.mergeCellRanges(array)
- You should see an UnsupportedOperationException thrown by AbstractList
Analysis:
The public method CellRangeUtil.mergeCellRanges() wraps an array into an
ArrayList using Arrays.asList(...) to pass the result to the corresponding
private method mergeCellRanges().
Under certain conditions mergeCellRanges() will try to shrink the list to a
smaller size. The error occurs because structural modification of a wrapped
Array is impossible.
Problem: CellRangeUtil line 99, error occurs at line 124
Proposed solution: Copy the array into a list rather than creating a list view
of the array.
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