PDFluent vs Java PDF Libraries

use pdfluent::Document;

fn main() -> pdfluent::Result<()> {
    let doc = Document::open("invoice.pdf")?;

    // Extract text from page 1
    let text = doc.page(0)?.extract_text()?;
    println!("{}", text);

    // Fill a form field
    let mut form = doc.acroform()?;
    form.set_field("invoice_number", "INV-2024-001")?;

    doc.save("invoice_filled.pdf")?;
    Ok(())
}

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.kernel.pdf.canvas.parser.PdfTextExtractor;
import com.itextpdf.kernel.pdf.canvas.parser.listener
    .LocationTextExtractionStrategy;

// Requires JVM — 1-3s cold start in Lambda
public class InvoiceProcessor {
    public static void main(String[] args) throws Exception {
        PdfDocument pdf = new PdfDocument(
            new PdfReader("invoice.pdf"),
            new PdfWriter("invoice_filled.pdf")
        );

        // Extract text from page 1
        String text = PdfTextExtractor.getTextFromPage(
            pdf.getPage(1),
            new LocationTextExtractionStrategy()
        );
        System.out.println(text);

        // Fill a form field
        PdfAcroForm form = PdfAcroForm.getAcroForm(pdf, true);
        form.getField("invoice_number")
            .setValue("INV-2024-001");

        pdf.close(); // must explicitly close
    }
}