From c3612e9ce03f281750d924a5e16d7154f70625b1 Mon Sep 17 00:00:00 2001
From: Liao Xin <93535922+liewstar@users.noreply.github.com>
Date: Thu, 23 Jan 2025 17:42:02 +0800
Subject: [PATCH] feat: show better error message (#42)

---
 src/main/java/org/casbin/Client.java | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/casbin/Client.java b/src/main/java/org/casbin/Client.java
index a2dadf2..a33b6aa 100644
--- a/src/main/java/org/casbin/Client.java
+++ b/src/main/java/org/casbin/Client.java
@@ -54,8 +54,13 @@ public static String run(String... args) {
             return o.toString();
 
         } catch (Exception e) {
-            e.printStackTrace();
-            System.out.println("Run './casbin --help or ./casbin -h' for usage.");
+            Throwable cause = e.getCause();
+            if (cause instanceof org.casbin.jcasbin.exception.CasbinMatcherException) {
+                System.out.println(cause.getMessage());
+            } else {
+                e.printStackTrace();
+                System.out.println("Run './casbin --help or ./casbin -h' for usage.");
+            }
             System.exit(1);
         }
         return result;