[PDFBOX-4947] UnsupportedOperationException when using FontMapperImpl.addSubstitute()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.21
• Fix Version/s: 2.0.22, 3.0.0 PDFBox
• Assignee: Tilman Hausherr
• Reporter: Lonzak
• Created: 01/Sep/20 14:06
• Updated: 20/Dec/20 18:48
• Resolved: 01/Sep/20 18:50

Description

I tried to add an additional substitue mapping however it throws an exception:

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)

=> 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.