Tess4j - How to configure another language?

Felipereis50 · September 27, 2025, 12:24pm

Hi friends,

In getting an error when trying to use another language.

Path

Variable connection

Error

The text you provided can be translated as follows:

"I’m having a problem with Tess4j in Node, trying to configure another language. I haven’t found any manual and I’m guessing the path forward is the one below.

I went to GitHub and downloaded a ‘por.traineddata’ file.
I’m connecting it via a variable, and I’m getting an ERROR."

“When I remove the variable, it works normally. But I need it to be in another language. Does anyone know this error?”

I attached the ‘por.traineddata’ file into data folder

Reading Image Based PDFs with Tika Parser.knwf (822.3 KB)

rfeigel · September 28, 2025, 2:59am

I installed the GitHub language file directly into Knime plugins and now its available as an internal choice in the Tess4J node.

Felipereis50 · September 28, 2025, 3:44pm

I performed the same procedure you explained, copying the file to the plugin folder, but the error persists. I tried with two “po.” files (downloaded from GITHUB), but it didn’t work.

Perhaps the files aren’t compatible with the KNIME models. I couldn’t find any others online.

STEPs

[Reading Image Based PDFs with Tika Parser_v2.knwf|attachment]

Reading Image Based PDFs with Tika Parser_v2.knwf (1.0 MB)

image-based-pdf-sample.pdf (224.0 KB)

rfeigel · September 28, 2025, 11:22pm

I can’t test your workflow because you stored the pdf locally so I don’t have access to it. Create a “data” folder in your workflow and store it there. Also the latest Tessaract version is 5.5.1. I don’t know about compatibility with the current Knime Tess4J node. @ScottF could you have someone weigh in?