diff --git a/.travis.yml b/.travis.yml
index d54bc433..91cc4227 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: python
 
 python:
+  - "3.4"
+  - "3.5"
   - "3.6"
 
 install:
diff --git a/tests/e2e/executors/java.py b/tests/e2e/executors/java.py
index 44a79588..9eb62776 100644
--- a/tests/e2e/executors/java.py
+++ b/tests/e2e/executors/java.py
@@ -24,8 +24,8 @@ def predict(self, X):
             "Executor", "Model", "score"
         ]
         exec_args.extend(map(str, X))
-        result = subprocess.run(exec_args, stdout=subprocess.PIPE)
-        items = result.stdout.decode("utf-8").split(" ")
+        result = subprocess.Popen(exec_args, stdout=subprocess.PIPE)
+        items = result.stdout.read().decode("utf-8").split(" ")
         if len(items) == 1:
             return float(items[0])
         else:
@@ -51,4 +51,4 @@ def prepare(self):
         # Compile all files together.
         exec_args = [self._javac_bin] + files_to_compile + (
             [os.path.join(self._resource_tmp_dir, "Executor.java")])
-        subprocess.run(exec_args)
+        subprocess.call(exec_args)