Fix jython build issue

.github/workflows/tests.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.5, 3.6, 3.8]
+        python-version: [3.8]
         plattform: ["Python"]
         include:
-          - python-version: 3.8
+          - python-version: 3.7
             plattform: "Jython"
             jython: org.python:jython-installer:2.7.2
             toxenv: "jython-driver-{hsqldb,mock}"
@@ -58,7 +58,7 @@ jobs:
         JYTHON: ${{ matrix.jython }}
     - name: Install dependencies
       # for some reason installing from https://github.com/baztian/tox-gh-actions/archive/allow-env-override.tar.gz doesn't work
-      run: pip install coveralls tox git+https://github.com/baztian/tox-gh-actions.git@allow-env-override
+      run: pip install coveralls tox==3.15.2 git+https://github.com/baztian/tox-gh-actions.git@allow-env-override
     - name: Test with tox for Jython only
       if: matrix.jython
       run: tox -e "${{ matrix.toxenv }}"

ci/before_install_jython.sh

@@ -8,3 +8,6 @@ if [ ! -d "$INST_DIR" ]; then
 fi
 pip install --upgrade virtualenv==15.1.0 tox==3.9.0
 sudo ln -s "$INST_DIR"/bin/jython /usr/local/bin/
+which jython
+jython --version
+echo "WHICH"