Responding with JSON not working after upgrade to version 5.X from 4.X

[johan313]

Expected Behavior

A JSON response is returned to the caller.

Actual Behaviour

Exception is thrown.

NoSuchMethodError occurred when processing request: [GET] /admin/test
'grails.core.GrailsDomainClassProperty grails.core.GrailsDomainClass.getIdentifier()'. Stacktrace follows:
...
...
Caused by: java.lang.NoSuchMethodError: 'grails.core.GrailsDomainClassProperty grails.core.GrailsDomainClass.getIdentifier()'
	at org.grails.web.converters.marshaller.json.DomainClassMarshaller.marshalObject(DomainClassMarshaller.java:116)
	at org.grails.web.converters.marshaller.json.DomainClassMarshaller.marshalObject(DomainClassMarshaller.java:52)
	at grails.converters.JSON.value(JSON.java:184)
	at grails.converters.JSON.convertAnother(JSON.java:144)
	at org.grails.web.converters.marshaller.json.CollectionMarshaller.marshalObject(CollectionMarshaller.java:41)
	at org.grails.web.converters.marshaller.json.CollectionMarshaller.marshalObject(CollectionMarshaller.java:30)
	at grails.converters.JSON.value(JSON.java:184)

Steps To Reproduce

Add the following dependency to a clean grails project:

implementation "org.grails:grails-datastore-rest-client:6.1.12.RELEASE"

The following code produces a no NoSuchMethodError when I call the endpoint:

def getSomething(final Long id) {
    respond MyEntity.get(id), formats: ['json']
}

or even easier is:

def test() {
    respond "value", formats: ['json']
 }

Results in Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'value' with class 'java.lang.String' to class 'grails.converters.JSON'.

This is caused by the dependency "org.grails:grails-datastore-rest-client:6.1.12.RELEASE", without it everything works fine. Please advice on a workaround or release a fix for the dependency.

Environment Information

• Windows
• JDK 15.0.2
• Grails 5.2.1

Example Application

No response

Version

5.2.1

[johan313]

Seems like I'm supposed to use Micronaut HTTP client https://docs.grails.org/latest/guide/REST.html#callingRestServices nowdays. However, the documentation seem to be out-of-date = non compiling and the Micronaut Client returns the Publisher interface which is not needed for m2m calls. This could be updated.

[osscontributor]

Does the code at https://github.com/jeffbrown/johan313issue12623/blob/d1797f4cb81184c1a703ce699c52644228de03ae/grails-app/controllers/johan313issue12623/DemoController.groovy#L6 throw a NoSuchMethodError in your environment?

[osscontributor]

I see the NoSuchMethodError when responding with a domain instance like you show:

respond MyEntity.get(id), formats: ['json']

But I don't understand why you are seeing it with this:

respond "value", formats: ['json']

I would expect a different problem with that.

Thank you for your feedback.

[osscontributor]

Seems like I'm supposed to use Micronaut HTTP client

I don't think an http client is involved in the problem described in this question. I think the issue is incompatible libraries in the dependency graph of the app.

[johan313]

Yes, the problem is incompatible libraries, but I assumed the cause was that I was not supposed to use grails-datastore-rest-client anymore.

[johan313]

Does the code at https://github.com/jeffbrown/johan313issue12623/blob/d1797f4cb81184c1a703ce699c52644228de03ae/grails-app/controllers/johan313issue12623/DemoController.groovy#L6 throw a NoSuchMethodError in your environment?

You still need me to check this? I can do it on Monday if so.

[johan313]

I would expect a different problem with that.

Yes, I get a different exception with that, I get

Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'value' with class 'java.lang.String' to class 'grails.converters.JSON

[donalmcnamee]

@johan313 Did you find a solution or work around for this issue?

[johan313]

@donalmcnamee

Didn't want to waste time on an outdated plugin so I removed grails-datastore-rest-client. Switched to Spring REST client for complex cases and the standard java.net.http package for simple, chose those because they are actively maintained in the foreseeable future.

[naeemghumman]

Service: TimeSheetWeekService Method : prepareSubmissions

I have concluded that the problem is due to Multimap<String, Object> result = ArrayListMultimap.create() I'll try to fix it tomorrow.

[kmpjsharma]

@naeemghumman , please let me know any update on this issue. we are using Grails 6.1.0 and getting error rendering Multimap<String, List<? extends Object>> as JSON, it has dependency on org.grails:grails-datastore-rest-client:6.1.9.RELEASE.

[naeemghumman]

@kmpjsharma, I am no longer working on the project where I was getting this issue.

[kmpjsharma]

I used GSON to convert Multimap<String, List<? extends Object>> as JSON Gson gson = new Gson(); String jsonStr = gson.toJson(eventsData,LinkedHashMap.class); render jsonStr