String text = new PDFTextStripper().getText(PDDocument.load(content));

import ammonite.ops._
import org.apache.pdfbox.pdmodel.PDDocument
import org.apache.pdfbox.text.PDFTextStripper

(0 until 100).par.foreach { i =>
  println(s"#$i. START.")
  val pdfTextStripper = new java.lang.ThreadLocal[PDFTextStripper] {
    override def initialValue: PDFTextStripper = {
      println(s"new PDFTextStripper. #$i")
      new PDFTextStripper
    }
  }

  val content = read.bytes! Path(FilePath(s"/data/file_$i.pdf"), pwd)
  val doc = PDDocument.load(content)
  println(pdfTextStripper.get.getText(doc))
}