Grails - JSONBuilder - Spec toPrettyString () returns stackoverflow
I am creating a unit test that should return JSON. To create this, I am using a method toPrettyString()
from JSONBuilder.
This is the class for the spec:
class Lugar {
String sigla
String nombre
Coordenada coordenada
String toString(){
"${sigla}"
}
String toJson()
{
new JsonBuilder( this ).toPrettyString()
}
static constraints = {
nombre blank: false , nullable: false
}
}
The specification for launch is as follows:
@TestFor(Lugar)
class LugarSpec extends Specification {
void "toJson not empty"() {
when:
Lugar lugar = new Lugar(sigla: "BUE", nombre:"BUENOS AIRES")
String aux = lugar.toJson();
then:
! aux.dump().empty
}
}
But the result is:
<error type="java.lang.StackOverflowError">java.lang.StackOverflowError
at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1270)
at groovy.lang.MetaBeanProperty.getProperty(MetaBeanProperty.java:60)
at groovy.lang.PropertyValue.getValue(PropertyValue.java:40)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:287)
at groovy.json.JsonOutput.writeMap(JsonOutput.java:421)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:291)
at groovy.json.JsonOutput.writeArray(JsonOutput.java:326)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:283)
at groovy.json.JsonOutput.writeMap(JsonOutput.java:421)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:291)
at groovy.json.JsonOutput.writeArray(JsonOutput.java:326)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:283)
at groovy.json.JsonOutput.writeMap(JsonOutput.java:421)
at groovy.json.JsonOutput.writeObject(JsonOutput.java:291)
And it continues to repeat itself to the end.
I tried to test toJson on main and the results were accurate:
static void main(String[] args) {
Lugar lugar = new Lugar(sigla: "BUE", nombre:"BUENOS AIRES")
String aux = lugar.toJson();
println aux.dump()
}
Results:
{
"sigla": "BUE",
"constraints": {
"nombre": {
"blank": false,
"nullable": false
}
},
"nombre": "BUENOS AIRES"
}
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I would not be the object itself to be responsible for formatting the content. First, you can look at the @ToString annotation, which allows you to specify which fields to include in the result.
http://docs.groovy-lang.org/latest/html/gapi/groovy/transform/ToString.html
Second, I would remove the toJson method and just allow the default json handler. Something like println new JsonBuilder (object) .toPrettyString ()
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