Sort jars before searching for mainClass

src/jgo/jgo.py

@@ -821,12 +821,18 @@ def _run(
         pass
 
     if not primary_endpoint.main_class:
-        _logger.info("Inferring main class from jar manifest")
-        jar_path = glob.glob(
-            os.path.join(workspace, primary_endpoint.jar_name())
+        glob_pattern = (
+            primary_endpoint.jar_name()
             .replace(Endpoint.VERSION_RELEASE, "*")
             .replace(Endpoint.VERSION_LATEST, "*")
-        )[0]
+        )
+        _logger.info(
+            f"Inferring main class from manifest of {primary_endpoint.jar_name()}"
+            f" using glob '{glob_pattern}'"
+        )
+        jar_paths = sorted(glob.glob(os.path.join(workspace, glob_pattern)))
+        _logger.debug(f"Using first jar from matching jars {jar_paths}")
+        jar_path = jar_paths[0]
         with zipfile.ZipFile(jar_path) as jar_file:
             with jar_file.open("META-INF/MANIFEST.MF") as manifest:
                 main_class_pattern = re.compile(".*Main-Class: *")

tests/test_run.py

@@ -416,6 +416,29 @@ def test_explicit_main_class(self, launch_java_mock):
         self.assertIsNone(stderr)
         self.assertFalse(check)
 
+    @patch("jgo.jgo.launch_java")
+    def test_infer_main_class(self, launch_java_mock):
+        parser = jgo_parser()
+        argv = ["com.pinterest.ktlint:ktlint-cli"]
+
+        run(parser, argv)
+        self.assertTrue(launch_java_mock.called)
+        args, kwargs = _call_args(launch_java_mock)
+        workspace = args[0]
+        jvm_args = args[1]
+        program_args = args[2:]
+        additional_jars = kwargs["additional_jars"]
+        stdout = kwargs["stdout"]
+        stderr = kwargs["stderr"]
+        check = kwargs["check"]
+        self.assertIsInstance(workspace, str)
+        self.assertEqual(jvm_args, [])
+        self.assertEqual(program_args, ("com.pinterest.ktlint.Main",))
+        self.assertEqual(additional_jars, [])
+        self.assertIsNone(stdout)
+        self.assertIsNone(stderr)
+        self.assertFalse(check)
+
 
 class TestUtil(unittest.TestCase):
     @patch("jgo.jgo._run")