# \[REST/WS\] POSTing obsgroup via rest throws serialization error
**URL:** https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827
**Category:** Development
**Tags:** ohri-forms, restws, ohri
**Created:** [October 8, 2021, 11:09am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827 "2021-10-08T11:09:43Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@samuel34](https://talk.openmrs.org/u/samuel34)
#### Post date: [October 8, 2021, 11:09am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/1 "2021-10-08T11:09:44Z")
Hi,
I get a funny error whenever I try POSTing an encounter with an `obsGroup` via rest. Below is a demo request body:
```auto
{
"patient": "76761b1f-729b-45c9-82e1-f4a8eee1957a",
"encounterDatetime": "2021-10-08T10:08:45.259Z",
"location": "28066518-a0e5-4331-b23e-7b40f96d733a",
"encounterType": "79c1f50f-f77d-42e2-ad2a-d29304dde2fe",
"encounterProviders": [
{
"provider": "82252c2a-3d17-48c0-a739-881ba41d3341",
"encounterRole": "240b26f9-dd88-4172-823d-4a8bfeb7841f"
}
],
"obs": [
{
"person": "76761b1f-729b-45c9-82e1-f4a8eee1957a",
"obsDatetime": "2021-10-08T10:08:45.259Z",
"concept": "8acba1d1-67cc-422c-961e-86d6b47bc45b",
"location": "28066518-a0e5-4331-b23e-7b40f96d733a",
"groupMembers": [
{
"person": "76761b1f-729b-45c9-82e1-f4a8eee1957a",
"obsDatetime": "2021-10-08T10:08:45.259Z",
"concept": "d3205b6a-7192-461f-9ea8-a1ac8af38964",
"location": "28066518-a0e5-4331-b23e-7b40f96d733a",
"value": 100
}
],
"voided": false
}
]
}
```
Error in response (Full server [log](https://pastebin.com/7sAyKA2d))
```auto
om.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.openmrs.module.webservices.validation.ValidationException["errors"]->org.springframework.validation.BindException["bindingResult"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"])
com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1277)
com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:400)
com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:71)
com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:33)
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1516)
com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1006)
org.springframework.web.servlet.view.json.AbstractJackson2View.writeContent(AbstractJackson2View.java:228)
org.springframework.web.servlet.view.json.AbstractJackson2View.renderMergedOutputModel(AbstractJackson2View.java:172)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.openmrs.module.web.filter.ForcePasswordChangeFilter.doFilter(ForcePasswordChangeFilter.java:60)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:73)
org.openmrs.web.filter.GZIPFilter.doFilterInternal(GZIPFilter.java:65)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.openmrs.module.webservices.rest.web.filter.AuthorizationFilter.doFilter(AuthorizationFilter.java:105)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.openmrs.module.webservices.rest.web.filter.ContentTypeFilter.doFilter(ContentTypeFilter.java:64)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal(ShallowEtagHeaderFilter.java:106)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.openmrs.module.owa.filter.OwaFilter.doFilter(OwaFilter.java:93)
org.openmrs.module.owa.filter.OwaFilter.doFilter(OwaFilter.java:61)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.openmrs.module.spa.filter.SpaFilter.doFilter(SpaFilter.java:53)
org.openmrs.module.web.filter.ModuleFilterChain.doFilter(ModuleFilterChain.java:71)
org.openmrs.module.web.filter.ModuleFilter.doFilter(ModuleFilter.java:57)
org.openmrs.web.filter.OpenmrsFilter.doFilterInternal(OpenmrsFilter.java:105)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.springframework.orm.hibernate5.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:156)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.openmrs.web.filter.StartupFilter.doFilter(StartupFilter.java:108)
org.openmrs.web.filter.StartupFilter.doFilter(StartupFilter.java:108)
org.openmrs.web.filter.StartupFilter.doFilter(StartupFilter.java:108)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
```
Server Props:
- Platform: `2.4.0`
- Rest Web Services: `2.32.0-SNAPSHOT.2601f8`
Is my request payload malformed?
cc: @dkayiwa, @ibacher
---
### Author:  [@ruhanga](https://talk.openmrs.org/u/ruhanga)
#### Post date: [October 11, 2021, 7:18am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/2 "2021-10-11T07:18:29Z")
@samuel34 , does this happen for downgraded versions of `Rest Web Services` module?
---
### Author:  [@samuel34](https://talk.openmrs.org/u/samuel34)
#### Post date: [October 11, 2021, 8:18pm UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/3 "2021-10-11T20:18:18Z")
No, I have tested this out in the [demo](https://demo.openmrs.org/openmrs/ws/rest/v1/encounter) environment and it works well.
```auto
{
"patient": "3a84e9e3-bdce-4bd8-ae68-5c72987bcba2",
"encounterDatetime": "2021-10-08T10:08:45.259Z",
"location": "aff27d58-a15c-49a6-9beb-d30dcfc0c66e",
"encounterType": "e22e39fd-7db2-45e7-80f1-60fa0d5a4378",
"encounterProviders": [
{
"provider": "f9badd80-ab76-11e2-9e96-0800200c9a66",
"encounterRole": "240b26f9-dd88-4172-823d-4a8bfeb7841f"
}
],
"obs": [
{
"person": "3a84e9e3-bdce-4bd8-ae68-5c72987bcba2",
"obsDatetime": "2021-10-08T10:08:45.259Z",
"concept": "dcbf92f3-d4d7-45e9-8772-b3ff1fd1d04a",
"location": "aff27d58-a15c-49a6-9beb-d30dcfc0c66e",
"groupMembers": [
{
"person": "3a84e9e3-bdce-4bd8-ae68-5c72987bcba2",
"obsDatetime": "2021-10-08T10:08:45.259Z",
"concept": "f382ac4d-88f5-4eba-81e8-afaf67d5a5b4",
"location": "aff27d58-a15c-49a6-9beb-d30dcfc0c66e",
"value": "129473AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
}
],
"voided": false
}
]
}
```
Openmrs’ Demo is running `2.32.0`. This actually awakened me that the release for `2.32.0` was made. @amugume don’t you think we want to upgrade to the latest version?
cc: @eudson
---
### Author:  [@samuel34](https://talk.openmrs.org/u/samuel34)
#### Post date: [October 12, 2021, 9:14am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/4 "2021-10-12T09:14:53Z")
We have installed the latest version of REST/WS (the same version running in demo) but the error persists.
_Below are the modules installed on the server:_
@dkayiwa any advice on how I would debug this?
---
### Author:  [@ruhanga](https://talk.openmrs.org/u/ruhanga)
#### Post date: [October 12, 2021, 9:29am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/5 "2021-10-12T09:29:16Z")
@samuel34, could you also share, for more debugging info, the equivalent of this page ` https://demo.openmrs.org/openmrs/admin/maintenance/systemInfo.htm`?
---
### Author:  [@samuel34](https://talk.openmrs.org/u/samuel34)
#### Post date: [October 12, 2021, 9:32am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/6 "2021-10-12T09:32:36Z")
@ruhanga [OpenMRS - Login](https://ohri-working.globalhealthapp.net/openmrs/admin/maintenance/systemInfo.htm) (Same credentials as the demo site)
---
### Author:  [@dkayiwa](https://talk.openmrs.org/u/dkayiwa)
#### Post date: [October 12, 2021, 10:00am UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/7 "2021-10-12T10:00:42Z")
From your logs, it looks like a validation exception. Can you confirm that all the uuids that you are passing are pointing to existing objects?
---
### Author:  [@samuel34](https://talk.openmrs.org/u/samuel34)
#### Post date: [October 12, 2021, 7:31pm UTC](https://talk.openmrs.org/t/rest-ws-posting-obsgroup-via-rest-throws-serialization-error/34827/8 "2021-10-12T19:31:03Z")
Hhhmm thanks Daniel, the issue was with my `providerId`.