From 7e1716b02d9904b624c9a453d9d3166b0e07d7f6 Mon Sep 17 00:00:00 2001
From: gxcsoccer <gxcsoccer@126.com>
Date: Fri, 1 Jun 2018 15:49:33 +0800
Subject: [PATCH] fix: add cause prop to exception

---
 lib/exception.js       | 4 ++++
 test/exception.test.js | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/lib/exception.js b/lib/exception.js
index 83332b5..97062b8 100644
--- a/lib/exception.js
+++ b/lib/exception.js
@@ -57,6 +57,10 @@ module.exports = function toException(err, className) {
         '$class': '[java.lang.StackTraceElement',
         '$': stackTraceElements,
       },
+      cause: {
+        '$class': 'java.lang.Throwable',
+        '$': null,
+      },
     },
   };
 };
diff --git a/test/exception.test.js b/test/exception.test.js
index d081f65..295aee0 100644
--- a/test/exception.test.js
+++ b/test/exception.test.js
@@ -17,6 +17,8 @@ describe('js error to java exception', function() {
     exception.$.stackTrace.$.forEach(function(ele) {
       assert.equal(ele.$class, 'java.lang.StackTraceElement');
     });
+    assert.equal(exception.$.cause.$class, 'java.lang.Throwable');
+    assert(exception.$.cause.$ === null);
     // console.log(JSON.stringify(exception, null, 2));
   });
 
@@ -29,6 +31,8 @@ describe('js error to java exception', function() {
     exception.$.stackTrace.$.forEach(function(ele) {
       assert.equal(ele.$class, 'java.lang.StackTraceElement');
     });
+    assert.equal(exception.$.cause.$class, 'java.lang.Throwable');
+    assert(exception.$.cause.$ === null);
     // console.log(JSON.stringify(exception, null, 2));
   });
 });