[PDFBOX-5859] StringIndexOutOfBoundsException in AppearanceGeneratorHelper

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.0.32, 3.0.2 PDFBox
• Fix Version/s: 2.0.33, 3.0.3 PDFBox, 4.0.0
• Component/s: AcroForm
• Assignee: Tilman Hausherr
• Reporter: Nicola Costantini
• Created: 01/Aug/24 19:48
• Updated: 10/Aug/24 07:18
• Resolved: 02/Aug/24 04:29

Description

The bug fix for PDFBOX-5784 created another issue.

In AppearanceGeneratorHelper line 676 is assumed, that fields have non-empty values:

 

font.getStringWidth(value.substring(0, 1))

 

resulting in this exceptions for empty fields, for example when refreshAppearances is called:

 

java.lang.StringIndexOutOfBoundsException: begin 0, end 1, length 0

    at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4602)
    at java.base/java.lang.String.substring(String.java:2705)
    at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.insertGeneratedCombAppearance(AppearanceGeneratorHelper.java:676)
    at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.insertGeneratedAppearance(AppearanceGeneratorHelper.java:569)
    at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.setAppearanceContent(AppearanceGeneratorHelper.java:441)
    at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.setAppearanceValue(AppearanceGeneratorHelper.java:248)
    at org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:264)
    at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:361)

 

 

Issue Links

• is duplicated by: PDFBOX-5860 StringIndexOutOfBoundsException in AppearanceGeneratorHelper
• relates to: PDFBOX-5784 AppearanceGeneratorHelper assumes fontscale 1000