Apache PDFBox is an open source pure-Java library that can be used to create, render, print, split, merge, alter, verify and extract text and meta-data of PDF files.
Ohloh reports almost 2,000 commits (since the start as an Apache project) by 17 contributors representing more than 100,000 lines of code. PDFBox has a well established, mature codebase maintained by a large development team with increasing Y-O-Y comments.
Using the COCOMO model, it took an estimated 30 person-years of effort.
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