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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+.. _troubleshooting:
+
+Troubleshooting
+===============
+
+**NOTE**
+
+According to **ONAP** logging policy, **Mapper** logs contain all required markers as well as service and client specific Mapped Diagnostic Context (later referred as MDC)
+
+Default console log pattern:
+
+::
+
+        |%date{"HH:mm:ss.SSSXXX", UTC}\t[ %thread\t] %highlight(%-5level)\t - %msg\t
+
+A sample, fully qualified message implementing this pattern:
+
+::
+
+        |11:10:13.230 [rcc-notification] INFO metricsLogger - fetch and publish from and to Dmaap started:rcc-notification
+
+
+For simplicity, all log messages in this section are shortened to contain only:
+    * logger name
+    * log level
+    * message
+
+Error and warning logs contain also:
+    * exception message
+    * stack trace
+
+**Do not rely on exact log messages or their presence, as they are often subject to change.**
+
+Deployment/Installation errors
+--------------------
+
+**Missing Default Config File in case of using local config instead of Consul**
+
+::
+
+
+   |13:04:37.535 [main] ERROR errorLogger - Default Config file kv.json is missing
+   |13:04:37.537 [main] ERROR errorLogger - Application stoped due to missing default Config file
+   |13:04:37.538 [main] INFO  o.s.s.c.ThreadPoolTaskExecutor - Shutting down ExecutorService 'applicationTaskExecutor'
+   |15:40:43.982 [main] WARN  debugLogger - All Smooks objects closed
+**These log messages are printed when the default configuration file "kv.json", was not present.**
+
+
+
+**Invalid Default Config File in case of using local config instead of Consul**
+
+If Default Config File  is an invalid json file, we will get below exception
+
+::
+
+ |15:19:52.489 [main] ERROR o.s.boot.SpringApplication - Application run failed
+ |java.lang.IllegalStateException: Failed to execute CommandLineRunner
+	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:816)
+	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:797)
+	at org.springframework.boot.SpringApplication.run(SpringApplication.java:324)
+	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
+	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
+	at org.onap.universalvesadapter.Application.main(Application.java:29)
+ |Caused by: org.json.JSONException: Expected a ',' or '}' at 8100 [character 2 line 54]
+	at org.json.JSONTokener.syntaxError(JSONTokener.java:433)
+	at org.json.JSONObject.<init>(JSONObject.java:229)
+	at org.json.JSONObject.<init>(JSONObject.java:321)
+	at org.onap.universalvesadapter.utils.FetchDynamicConfig.verifyConfigChange(FetchDynamicConfig.java:97)
+	at org.onap.universalvesadapter.utils.FetchDynamicConfig.cbsCall(FetchDynamicConfig.java:66)
+	at org.onap.universalvesadapter.service.VESAdapterInitializer.run(VESAdapterInitializer.java:83)
+	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:813)
+	... 5 common frames omitted
+ |15:19:52.492 [main] INFO  o.s.s.c.ThreadPoolTaskExecutor - Shutting down ExecutorService 'applicationTaskExecutor'
+ |15:19:52.493 [main] WARN  debugLogger - All Smooks objects closed
+
+
+**Invalid Smooks mapping file**
+
+If VES-Mapper blueprint or local config file contains invalid Smooks mapping file, then we will get below SAXException / JsonProcessingException / JsonSyntaxException / JsonParseException while processing the incoming notifications and the notification will be dropped without converting into required VES event. All such dropped notifications will be logged in error log file.
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