pappmiku opened a new issue, #14931:
URL: https://github.com/apache/grails-core/issues/14931
### Expected Behavior
When a controller attempts to respond with an object implementing
`grails.validation.Validateable`, validation objects should not be serialized
(possibly with the exception of the `errors` field, which was the case in
Grails 6.2.3, but I assume no actual validation was being performed).
### Actual Behaviour
Attempting to respond with a validateable object results in incorrect
serialization and/or an exception. It seems that non-string fields cause
exceptions (see below; id is a Long), with them removed the serialization
passes, but there are two extra fields - `constraints` and `constraintsMap` -
included in the resulting json.
Is this an intended behavior going forward? I know it doesn't necessarily
make sense to even have validateable response dtos, but this is the code I have
to work with. 😄 Though a lot of them are used as both requests and responses...
<details>
<summary>Stacktrace:</summary>
```
java.lang.reflect.InvocationTargetException: null
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
org.grails.core.DefaultGrailsControllerClass$ReflectionInvoker.invoke(DefaultGrailsControllerClass.java:210)
at
org.grails.core.DefaultGrailsControllerClass.invoke(DefaultGrailsControllerClass.java:187)
at
org.grails.web.mapping.mvc.UrlMappingsInfoHandlerAdapter.handle(UrlMappingsInfoHandlerAdapter.groovy:108)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
at
org.eclipse.jetty.ee10.servlet.ServletHolder.handle(ServletHolder.java:736)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1622)
at
org.eclipse.jetty.ee10.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:195)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:80)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:70)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594)
at
org.eclipse.jetty.ee10.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1555)
at
org.eclipse.jetty.ee10.servlet.ServletChannel.dispatch(ServletChannel.java:823)
at
org.eclipse.jetty.ee10.servlet.ServletChannel.handle(ServletChannel.java:440)
at
org.eclipse.jetty.ee10.servlet.ServletHandler.handle(ServletHandler.java:470)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:575)
at
org.eclipse.jetty.ee10.servlet.SessionHandler.handle(SessionHandler.java:717)
at
org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1071)
at org.eclipse.jetty.server.Handler$Wrapper.handle(Handler.java:740)
at
org.eclipse.jetty.server.handler.EventsHandler.handle(EventsHandler.java:81)
at org.eclipse.jetty.server.Server.handle(Server.java:182)
at
org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:678)
at
org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:416)
at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
at
org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:981)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1211)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1166)
at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: org.grails.web.converters.exceptions.ConverterException: Error
converting Bean with class grails.validation.ConstrainedDelegate
at
org.grails.web.converters.marshaller.json.GroovyBeanMarshaller.marshalObject(GroovyBeanMarshaller.java:88)
at
org.grails.web.converters.marshaller.json.GroovyBeanMarshaller.marshalObject(GroovyBeanMarshaller.java:42)
at grails.converters.JSON.value(JSON.java:187)
at grails.converters.JSON.convertAnother(JSON.java:147)
at
org.grails.web.converters.marshaller.json.MapMarshaller.marshalObject(MapMarshaller.java:48)
at
org.grails.web.converters.marshaller.json.MapMarshaller.marshalObject(MapMarshaller.java:33)
at grails.converters.JSON.value(JSON.java:187)
at grails.converters.JSON.convertAnother(JSON.java:147)
at
org.grails.web.converters.marshaller.json.GroovyBeanMarshaller.marshalObject(GroovyBeanMarshaller.java:70)
at
org.grails.web.converters.marshaller.json.GroovyBeanMarshaller.marshalObject(GroovyBeanMarshaller.java:42)
at grails.converters.JSON.value(JSON.java:187)
at grails.converters.JSON.render(JSON.java:122)
at
org.grails.plugins.web.rest.render.json.DefaultJsonRenderer.renderJson(DefaultJsonRenderer.groovy:119)
at
org.grails.plugins.web.rest.render.json.DefaultJsonRenderer.renderJson(DefaultJsonRenderer.groovy:113)
at
org.grails.plugins.web.rest.render.json.DefaultJsonRenderer.render(DefaultJsonRenderer.groovy:94)
at
grails.artefact.controller.RestResponder$Trait$Helper.internalRespond(RestResponder.groovy:218)
at
grails.artefact.controller.RestResponder$Trait$Helper.respond(RestResponder.groovy:124)
at
org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
at
org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
at
org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
at com.example.TestController.testFail(TestController.groovy:14)
... 46 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
org.grails.web.converters.marshaller.json.GroovyBeanMarshaller.marshalObject(GroovyBeanMarshaller.java:68)
... 66 common frames omitted
Caused by: groovy.lang.MissingPropertyException: CreditCard constraint only
applies to a String property
at
grails.gorm.validation.DefaultConstrainedProperty.isCreditCard(DefaultConstrainedProperty.groovy:403)
at
grails.validation.ConstrainedDelegate.isCreditCard(ConstrainedDelegate.groovy:123)
... 69 common frames omitted
```
</details>
<details>
<summary>JSON generated in Grails 6.2.3:</summary>
```json
{
"companies" : [ {
"errors" : {
"errors" : [ ]
},
"id" : 1,
"info" : "",
"name" : "."
}, {
"errors" : {
"errors" : [ ]
},
"id" : 2,
"info" : "",
"name" : ""
} ],
"timestamp" : "2025-07-22T13:15:42.81+02:00"
}
```
</details>
<details>
<summary>JSON generated in Grails 7:</summary>
```json
{
"companies" : [ {
"constraints" : {
"delegate" : "cz.actis.exevido.admin.CompanyDTO",
"directive" : 0,
"maximumNumberOfParameters" : 1,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"parameterTypes" : [ "java.lang.Object" ],
"resolveStrategy" : 0,
"thisObject" : "cz.actis.exevido.admin.CompanyDTO"
},
"constraintsMap" : {
"name" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "name",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "name",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 2,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "name",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "name",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 2,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "name",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "name",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"info" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "info",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "info",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 3,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "info",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "info",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 3,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "info",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "info",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"id" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "id",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 4,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "id",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 4,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "id",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "id",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
}
},
"errors" : {
"errors" : [ ]
},
"id" : "",
"info" : "",
"name" : ""
}, {
"constraints" : {
"delegate" : "cz.actis.exevido.admin.CompanyDTO",
"directive" : 0,
"maximumNumberOfParameters" : 1,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"parameterTypes" : [ "java.lang.Object" ],
"resolveStrategy" : 0,
"thisObject" : "cz.actis.exevido.admin.CompanyDTO"
},
"constraintsMap" : {
"name" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "name",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "name",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 2,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "name",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "name",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 2,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "name",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "name",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"info" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "info",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "info",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 3,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "info",
"valid" : true
}, {
"blank" : true,
"name" : "blank",
"parameter" : true,
"propertyName" : "info",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 3,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "info",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "info",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"id" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "id",
"valid" : true
} ],
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 4,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"property" : {
"appliedConstraints" : [ {
"name" : "nullable",
"nullable" : true,
"parameter" : true,
"propertyName" : "id",
"valid" : true
} ],
"attributes" : { },
"blank" : true,
"creditCard" : false,
"display" : true,
"editable" : true,
"email" : false,
"format" : null,
"inList" : null,
"matches" : null,
"max" : null,
"maxSize" : null,
"metaConstraints" : { },
"min" : null,
"minSize" : null,
"notEqual" : null,
"nullable" : true,
"order" : 4,
"owner" : "cz.actis.exevido.admin.CompanyDTO",
"owningClass" : "cz.actis.exevido.admin.CompanyDTO",
"password" : false,
"propertyName" : "id",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
},
"propertyName" : "id",
"propertyType" : "java.lang.String",
"range" : null,
"scale" : null,
"size" : null,
"url" : false,
"widget" : null
}
},
"errors" : {
"errors" : [ ]
},
"id" : "",
"info" : "",
"name" : ""
} ],
"timestamp" : "2025-07-22T13:04:18.065+02:00"
}
```
</details>
<details>
<summary>Frontend call response:</summary>
<img width="536" height="502" alt="Image"
src="https://github.com/user-attachments/assets/4a64d8c9-bd6a-4af5-a8da-76a364826353";
/>
</details>
### Steps To Reproduce
I've prepared a very simple example from a Forge generated app, see below.
Unfortunately I'm unable to replicate the ability to get the "bad" serialized
dto json there, so above I've attached examples from the project I'm working on.
1. start the application
2. go to localhost:8080/api/test/ok - the dto is returned as expected
3. go to localhost:8080/api/test/fail - serialization fails with "Error
converting Bean with class grails.validation.ConstrainedDelegate - CreditCard
constraint only applies to a String property"
### Environment Information
- OS: Manjaro Linux 6.15.6-arch1-1.1-g14
- JDK: 17.0.15-tem
### Example Application
https://github.com/pappmiku/grails-7-ser-ex
### Version
7.0.0-SNAPSHOT
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