Error Handling

The Nuxeo API communicates error messages through standard HTTP status codes paired with exception details.

You can find more details about standard HTTP status codes on:

Two modes are available:

Simple (without exception stack trace)
Extended (with exception stack trace)

Simple mode is activated by default. The extended mode can be configured through a parameter (in nuxeo.conf): org.nuxeo.rest.stack.enable=true.

Properties

Key	Type	Value
`entity-type`	string	'exception' (in the case of exceptions)
`code`	string	The technical exception identity (Java class)
`status`	integer	The HTTP status of the error response
`message`	string	A human-readable message about the error
`stacktrace`	string	The entire stack trace in one string
`exception`	JSON object	The entire stack trace wrapped into a JSON Object

Exception Example

Here is an example of an exception when fetching a missing document.

Simple Mode

JSON Response

{
  "entity-type": "exception",
  "code": "org.nuxeo.ecm.webengine.model.exceptions.WebResourceNotFoundException",
  "status": 404,
  "message": "Failed to get document /wrongID"
}

Extended Mode

{
  "entity-type": "exception",
  "code": "org.nuxeo.ecm.webengine.model.exceptions.WebResourceNotFoundException",
  "status": 404,
  "message": "Failed to get document /wrongID",
  "stacktrace": "org.nuxeo.ecm.webengine.WebException: Failed to get document /wrongID\n\tat org.nuxeo.ecm.webengine.WebException.newException(WebException.java[.........]",
  "exception": {
    "className": "org.nuxeo.ecm.webengine.model.exceptions.WebResourceNotFoundException",
    "cause": {
      "className": "org.nuxeo.ecm.core.model.NoSuchDocumentException",
      "cause": null,
      "message": "No such document: No such document: /wrongID",
      "localizedMessage": "No such document: No such document: /wrongID",
      "stackTrace": [
      [.................................]
      ]
    }
  }
}

The Automation Client requires the full stack trace by default. So compatibility has been kept and all automation client calls will activate the extended mode.

All calls with accepted media type application/json+nxentity will activate stack trace display.

Mode Activation API

For testing purposes, you can activate the extended mode by adding this code snippet:

JsonFactoryManager jsonFactoryManager = Framework.getLocalService(JsonFactoryManager.class);
if (!jsonFactoryManager.isStackDisplay()) {
    jsonFactoryManager.toggleStackDisplay();
}

To toggle the display mode (simple or extended) during runtime execution, you can:

Use the Automation JsonStack.ToggleDisplay Operation (Administrator role only) Example:

cURL Call

curl -H 'Content-Type:application/json+nxrequest' -X POST -d '{"params":{},"context":{}}' -u Administrator:Administrator http://NUXEO_SERVER:8080/nuxeo/api/v1/automation/JsonStack.ToggleDisplay

Use the following endpoint URL in your browser (Administrator role only)

Type into your browser address
```
http://NUXEO_SERVER/nuxeo/site/automation/doc/toggleStackDisplay
```