diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index ce6f34e..90392e4 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         python-version: [ 3.8, 3.9 ]
-        java-version: [ 11, 17 ]
+        java-version: [ 17 ]
         maven-version: [ '3.8.6' ]
     steps:
       - uses: actions/checkout@v2
diff --git a/src/trustyai/utils/data_conversions.py b/src/trustyai/utils/data_conversions.py
index 1f69c62..00d8a83 100644
--- a/src/trustyai/utils/data_conversions.py
+++ b/src/trustyai/utils/data_conversions.py
@@ -1,4 +1,5 @@
 """Data Converters between Python and Java"""
+
 # pylint: disable = import-error, line-too-long, trailing-whitespace, unused-import, cyclic-import
 # pylint: disable = consider-using-f-string, invalid-name, wrong-import-order
 import warnings
@@ -7,12 +8,13 @@
 
 import trustyai.model
 from org.kie.trustyai.explainability.model import (
-    Dataframe,
     Feature,
     Output,
     PredictionInput,
     PredictionOutput,
 )
+from org.kie.trustyai.explainability.model.dataframe import Dataframe
+
 from org.kie.trustyai.explainability.model.domain import (
     FeatureDomain,
     EmptyFeatureDomain,