Infinite Loop in Table.drawRow() with Large Content and Headers

[raikowagner]

Infinite Loop in Table.drawRow() with Large Content and Headers

Summary

When drawing a table with headers and a content row that is too tall to fit on a page, Boxable enters an infinite loop creating blank pages instead of properly handling the page break.

Root Cause

The bug occurs in Table.java during the header height recalculation on a new page. After a row is drawn, the Cell.lineStart value is set to Integer.MAX_VALUE (line 1022). When the height of header cells is recalculated for the new page, Paragraph.getHeight(Integer.MAX_VALUE) is called, which causes:

1. Paragraph.getHeight(lineStart) with lineStart = Integer.MAX_VALUE
2. The condition if (getLines().size() <= lineStart) evaluates to true
3. The method returns 0, making the header appear to have a height of paddings and borders and no content height
4. The available space calculation becomes incorrect
5. the content row appears to fit on a new page
6. a new page is created which gets a new header
7. because the content height did not change, and it won't get split, an infinite loop of header only page creation is started

Expected Behavior

• Header height should be calculated correctly when checking if content could fit on a new page

Actual Behavior

• application eventually runs out of memory (OOM)

Environment

• Boxable Version: 1.8.2

Impact

• Critical - Causes OOM and application crash during PDF generation
• affects any table with headers and large content rows