TesserAct is an Open Source OCR tool (see http://code.google.com/p/tesseract-ocr/).
Tess4J is a Java JNA wrapper for TesserAct (see http://tess4j.sourceforge.net/) with all Windows dependencies combined.
For Linux some dependencies have to be installed. This Docker image provides all dependencies pre-installed, so Tess4J is good to go. English, French and Dutch languages installed.
Code example: see http://tess4j.sourceforge.net/codesample.html