From 238f5d9b8b9e4819a9909a7403dcbc7bec0dc714 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 29 Apr 2019 22:31:55 -0700
Subject: Log exception root cause

---
 src/main/java/org/traccar/api/ResourceErrorHandler.java | 12 +++---------
 src/main/java/org/traccar/helper/Log.java               |  5 +++++
 src/test/java/org/traccar/helper/LogTest.java           | 13 +++++++++++--
 3 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/src/main/java/org/traccar/api/ResourceErrorHandler.java b/src/main/java/org/traccar/api/ResourceErrorHandler.java
index 1d618b08d..108a8e8cc 100644
--- a/src/main/java/org/traccar/api/ResourceErrorHandler.java
+++ b/src/main/java/org/traccar/api/ResourceErrorHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2019 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,14 +26,8 @@ public class ResourceErrorHandler implements ExceptionMapper<Exception> {
     @Override
     public Response toResponse(Exception e) {
         if (e instanceof WebApplicationException) {
-            WebApplicationException exception = (WebApplicationException) e;
-            String message;
-            if (exception.getCause() != null) {
-                message = Log.exceptionStack(exception.getCause());
-            } else {
-                message = Log.exceptionStack(exception);
-            }
-            return Response.fromResponse(exception.getResponse()).entity(message).build();
+            WebApplicationException webException = (WebApplicationException) e;
+            return Response.fromResponse(webException.getResponse()).entity(Log.exceptionStack(webException)).build();
         } else {
             return Response.status(Response.Status.BAD_REQUEST).entity(Log.exceptionStack(e)).build();
         }
diff --git a/src/main/java/org/traccar/helper/Log.java b/src/main/java/org/traccar/helper/Log.java
index f328e8ce9..607a0585f 100644
--- a/src/main/java/org/traccar/helper/Log.java
+++ b/src/main/java/org/traccar/helper/Log.java
@@ -211,6 +211,11 @@ public final class Log {
     }
 
     public static String exceptionStack(Throwable exception) {
+        Throwable cause;
+        while (null != (cause = exception.getCause())  && (exception != cause) ) {
+            exception = cause;
+        }
+
         StringBuilder s = new StringBuilder();
         String exceptionMsg = exception.getMessage();
         if (exceptionMsg != null) {
diff --git a/src/test/java/org/traccar/helper/LogTest.java b/src/test/java/org/traccar/helper/LogTest.java
index 853eb05c9..ef33c32ba 100644
--- a/src/test/java/org/traccar/helper/LogTest.java
+++ b/src/test/java/org/traccar/helper/LogTest.java
@@ -7,8 +7,17 @@ import static org.junit.Assert.assertEquals;
 public class LogTest {
     
     @Test
-    public void testLog() {
-        assertEquals("test - Exception (LogTest:11 < ...)", Log.exceptionStack(new Exception("test")));
+    public void testExceptionStack() {
+        assertEquals(
+                "test - Exception (LogTest:11 < ...)",
+                Log.exceptionStack(new Exception("test")));
+    }
+
+    @Test
+    public void testExceptionStackRootCause() {
+        assertEquals(
+                "root - Exception (LogTest:18 < ...)",
+                Log.exceptionStack(new Exception("test", new Exception("root"))));
     }
 
 }
-- 
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