MissingMethodException Error

[Dan King]

I recently started learning grails/groovy - reading along with "Grails: A Quick Start Guide"; I've run into this error which has got me stumped. Anyone know what's wrong? Following is the error message:

Error 500: groovy.lang.MissingMethodException: No signature of method: TechEvent.get() is applicable for argument types: (java.lang.String, java.lang.String) values: [1, ]
Servlet: grails
URI: /TechDays/grails/message/save.dispatch
Exception Message: No signature of method: TechEvent.get() is applicable for argument types: (java.lang.String, java.lang.String) values: [1, ]
Caused by: groovy.lang.MissingMethodException: No signature of method: TechEvent.get() is applicable for argument types: (java.lang.String, java.lang.String) values: [1, ]
Class: MessageController
At Line: [100]
Code Snippet:

99: def save = {
100: def messageInstance = new Message(params)
101: if(!messageInstance.hasErrors() && messageInstance.save()) {

[Gregg Bolinger]

I know why this is happening but without seeing your Message and TechEvent domains I can't really explain it to you and tell you how to fix it. Basically, for some reason, when Message(params) does it's stuff, it is trying to get a TechEvent using 2 String parameters. The get method in GORM usually accepts an Integer which would be the ID of the object you need or an Object, but not a String, and not 2 Strings. Can you show us your domain classes?

[Dan King]

Gregg Bolinger wrote:...Can you show us your domain classes?

Message domain:

class Message {
    String subject
    String content
    Message parent
    TechEvent event
    TechUser author

    static constraints = {
        subject(blank: false)
        content(blank: false, maxSize: 2000)
        parent(nullable: true)
        author(nullable: false)
    }

    static belongsTo = TechEvent
}

TechEvent domain:

class TechEvent {
    String city
    String name
    TechUser organizer
    String venue
    Date startDate
    Date endDate
    String description
    static hasMany = [volunteers: TechUser, respondents: String, sponsorships: Sponsorship,
                        tasks: Task, messages: Message]

    String toString() {
        return "$name, $city"
    }
    static constraints = {
        name()
        city()
        description(maxSize: 5000)
        organizer()
        venue()
        startDate()
        endDate()
        volunteers()
        respondents()
        tasks(nullable: true)
        messages(nullable: true)
    }
}

[Dan King]

Gregg Bolinger wrote:Basically, for some reason, when Message(params) does it's stuff, it is trying to get a TechEvent using 2 String parameters. The get method in GORM usually accepts an Integer which would be the ID of the object you need or an Object, but not a String, and not 2 Strings...

The issue was a hidden field in a form within my gsp, which duplicated an active field; thus upon submission it would send two arguments for the same parameter. I removed the hidden field and it now almost works. While I am now able to create a "new" message, when I try to "reply" I get the following error, which seems to be a grails bug:

Error 500: java.lang.ClassCastException: TechEvent$__clinit__closure1 cannot be cast to java.util.Map
Servlet: grails
URI: /TechDays/grails/message/save.dispatch
Exception Message: TechEvent$__clinit__closure1 cannot be cast to java.util.Map
Caused by: java.lang.ClassCastException: TechEvent$__clinit__closure1 cannot be cast to java.util.Map
Class: MessageController
At Line: [100]
Code Snippet:

99: def save = {
100: def messageInstance = new Message(params)
101: if(!messageInstance.hasErrors() && messageInstance.save()) {