BATCHEE-121 add a way to define a lifecycle via system properties
diff --git a/tools/cli/src/main/java/org/apache/batchee/cli/command/JobOperatorCommand.java b/tools/cli/src/main/java/org/apache/batchee/cli/command/JobOperatorCommand.java
index 27c9891..3421bcf 100644
--- a/tools/cli/src/main/java/org/apache/batchee/cli/command/JobOperatorCommand.java
+++ b/tools/cli/src/main/java/org/apache/batchee/cli/command/JobOperatorCommand.java
@@ -174,6 +174,11 @@
         try {
             final Lifecycle<Object> lifecycleInstance;
             final Object state;
+
+            if (lifecycle == null) {
+                lifecycle = System.getProperty("org.apache.batchee.cli.lifecycle");
+            }
+
             if (lifecycle != null) {
                 lifecycleInstance = createLifecycle(loader);
                 state = lifecycleInstance.start();