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https://issues.apache.org/jira/browse/PDFBOX-4947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188726#comment-17188726
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ASF subversion and git services commented on PDFBOX-4947:
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Commit 1881368 from Tilman Hausherr in branch 'pdfbox/branches/issue45'
[ https://svn.apache.org/r1881368 ]
PDFBOX-4947: create a real List instead of an AbstractList (created by
Arrays.asList) so that addSubstitute() works, as suggested by Lonzak
> UnsupportedOperationException when using FontMapperImpl.addSubstitute()
> -----------------------------------------------------------------------
>
> Key: PDFBOX-4947
> URL: https://issues.apache.org/jira/browse/PDFBOX-4947
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.21
> Reporter: Lonzak
> Priority: Major
> Fix For: 3.0.0 PDFBox, 2.0.22
>
>
> I tried to add an additional substitue mapping however it throws an exception:
> {code:java}
> java.lang.UnsupportedOperationException
> at java.util.AbstractList.add(AbstractList.java:148)
> at java.util.AbstractList.add(AbstractList.java:108)
> at
> org.apache.pdfbox.pdmodel.font.FontMapperImpl.addSubstitute(FontMapperImpl.java:210){code}
> => Thus the addSubstitute() method is useless
> The reason is that for instantiating the mapping only a skeleton list from
> "Arrays.asList()" is used. This list doesn't support many methods of List
> interface and throws the exception.
> +*Solution:*+
> Replace the " Arrays.asList()" with the real list like new ArrayList() or the
> like.
>
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