longwa opened a new issue, #14275:
URL: https://github.com/apache/grails-core/issues/14275
When calling `response.json` in a Specification to test a RestfulController
that `respond` with an empty list, an error occurs if you have created a
default `/object/_object.gson` view such as:
```
model {
Object object
}
json g.render(object)
```
Condition failed with Exception:
```
response.json.size() == 0
| |
| org.grails.web.converters.exceptions.ConverterException: Error
parsing JSON
| at grails.converters.JSON.parse(JSON.java:260)
| at
org.grails.plugins.testing.AbstractGrailsMockHttpServletResponse.getJson(AbstractGrailsMockHttpServletResponse.groovy:93)
| at example.FooControllerSpec.test
something(FooControllerSpec.groovy:20)
| Caused by: org.grails.web.json.JSONException: Missing value. at
character 0 of
| at
org.grails.web.json.JSONTokener.syntaxError(JSONTokener.java:481)
| at
org.grails.web.json.JSONTokener.nextValue(JSONTokener.java:358)
| at grails.converters.JSON.parse(JSON.java:251)
| ... 2 more
<org.grails.plugins.testing.GrailsMockHttpServletResponse@379efd4e
outputStreamAccessAllowed=true writerAccessAllowed=true
characterEncoding=ISO-8859-1 charset=false content=
outputStream=org.springframework.mock.web.MockHttpServletResponse$ResponseServletOutputStream@18b06b
writer=null contentLength=0 contentType=application/json bufferSize=4096
committed=false locale=en_US cookies=[]
headers=[Content-Type:[application/json]] status=200 errorMessage=null
forwardedUrl=null includedUrls=[]>
```
Without the default GSON view, it works ok.
If you change the grails version to 4.0.5, the test will pass successfully,
so this seems to be a regression in 4.0.6.
### Task List
- [x] Steps to reproduce provided
- [x] Stacktrace (if present) provided
- [x] Example that reproduces the problem uploaded to Github
- [x] Full description of the issue provided (see below)
### Steps to Reproduce
Download the sample application and run:
- git clone https://github.com/longwa/grails-gson-view-issue
- gradle test
The key is to call respond for a JSON format without an explicit GSON view
to render.
### Expected Behaviour
`response.json` should succeed and essentially return empty (size == 0) as
it does in 4.0.5.
### Actual Behaviour
An error occurs when `JSON.parse()` is called b/c the output stream has an
empty string instead of empty array syntax: `""` vs `"[]"`. This seems to be a
result of the `_object.gson` being used, which causes the renderer to follow a
different path.
### Environment Information
- **Operating System**: macOS 10.15.7
- **Grails Version:** 4.0.6
- **JDK Version:** zulu-1.8_275
### Example Application
- https://github.com/longwa/grails-gson-view-issue
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