maybe this will work, because it works locally...

docker-compose.yml

@@ -11,7 +11,7 @@ services:
             - ./swagger_server/classla/classla_resources:/root/classla_resources
         environment:
             - PYTHONUNBUFFERED=1
-    tika:
+    tika2:
         image: apache/tika:1.28.4-full
         entrypoint: ["/bin/sh", "-c", "java -jar /tika-server-1.28.4.jar -h 0.0.0.0 -p 9999"]
         restart: always

swagger_server/controllers/doc2text_controller.py

@@ -12,7 +12,7 @@ import xml.etree.ElementTree as ET
 from PyPDF2 import PdfReader
 from swagger_server.classla import cl_utils
 
-tika_server = "http://localhost:9999/tika"
+tika_server = "http://tika2:9999/tika"
 
 # endpoint below to be used only for development purposes (don't need to run docker)
 # tika_server = "http://rsdo.lhrs.feri.um.si:9998/tika"