Getting exception for content type application/json

[faridiflex]

Hi

I am getting the HttpMessageNotWritableException when I try to execute the following code:

def rest = new RestBuilder(connectTimeout:10000, readTimeout:20000)
def resp = rest.post("http://requestb.in/1mhfid91"){
json {
name = "test-group"
description = "A temporary test group"
}
}

Please suggest if I am missing something.

Here is the Exception message:

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException) (through reference chain: grails.converters.JSON["depth"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: grails.converters.JSON["depth"])
at grails.plugins.rest.client.RestBuilder.invokeRestTemplate(RestBuilder.groovy:307)
at grails.plugins.rest.client.RestBuilder.doRequestInternal(RestBuilder.groovy:280)
at grails.plugins.rest.client.RestBuilder.doRequestInternal(RestBuilder.groovy:268)
at grails.plugins.rest.client.RestBuilder.post(RestBuilder.groovy:154)
at com.simpleinteract.util.UrlShortenerService$$EObVm8au.shortenUrl(UrlShortenerService.groovy:54)
at Script1.run(Script1.groovy:14)
at org.grails.plugins.console.ConsoleService.eval(ConsoleService.groovy:57)
at org.grails.plugins.console.ConsoleService.eval(ConsoleService.groovy:37)
at org.grails.plugins.console.ConsoleController$_closure2.doCall(ConsoleController.groovy:61)
at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195)
at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: grails.converters.JSON["depth"])
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:232)
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:197)
at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:183)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:559)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:120)
at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1727)
... 14 more
Caused by: java.lang.NullPointerException
at grails.converters.JSON.getDepth(JSON.java:217)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:653)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:509)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
... 17 more
undefined

[ross-oreto]

I'm also getting this error using almost identical code.

[brianbyers]

Add in the contentType of json, I was having the same issue until I added that

def rest = new RestBuilder(connectTimeout:10000, readTimeout:20000)
def resp = rest.post("http://requestb.in/1mhfid91"){
contentType "application/json"
json {
name = "test-group"
description = "A temporary test group"
}
}