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JSON.serialize results in System.JSONException: Salesforce System Error

I'm trying to serialize an object of Map<String, Object> type into json string using JSON.serialize method, but it keeps crashing. Here is stacktrace for one such execution
  
34.0 APEX_CODE,DEBUG;APEX_PROFILING,INFO;CALLOUT,INFO;DB,INFO;SYSTEM,DEBUG;VALIDATION,INFO;VISUALFORCE,INFO;WORKFLOW,INFO
12:24:15.064 (64561656)|EXECUTION_STARTED
12:24:15.064 (64624655)|CODE_UNIT_STARTED|[EXTERNAL]|06690000005iyPH|VFRemote: TestController invoke(saveForm)
12:24:15.064 (64670374)|SYSTEM_MODE_ENTER|true
12:24:15.066 (66479728)|METHOD_ENTRY|[1]|01p900000072RHd|TestController.TestController()
12:24:15.066 (66578736)|SYSTEM_MODE_ENTER|false
12:24:15.066 (66600814)|SYSTEM_MODE_EXIT|false
12:24:15.066 (66634140)|METHOD_EXIT|[1]|TestController
12:24:15.066 (66662920)|SYSTEM_MODE_ENTER|false
12:24:15.067 (67044839)|SYSTEM_METHOD_ENTRY|[5]|String.valueOf(Object)
12:24:15.067 (67514273)|SYSTEM_METHOD_EXIT|[5]|String.valueOf(Object)
12:24:15.067 (67578792)|SYSTEM_METHOD_ENTRY|[5]|System.debug(ANY)
12:24:15.067 (67781555)|USER_DEBUG|[5]|DEBUG|## data FormData:[config={baseobjects=[{name=Contact}, {name=Account}], pages=[{rows=[{name=Account Row}, {name=Contact Row}]}]}]
12:24:15.067 (67812570)|SYSTEM_METHOD_EXIT|[5]|System.debug(ANY)
12:24:15.067 (67897852)|SYSTEM_METHOD_ENTRY|[6]|TestController.FormData.__sfdc_config()
12:24:15.067 (67963920)|SYSTEM_METHOD_EXIT|[6]|TestController.FormData.__sfdc_config()
12:24:15.068 (68111137)|SYSTEM_METHOD_ENTRY|[6]|System.JSON.serialize(Object)
12:24:15.076 (76852763)|SYSTEM_METHOD_EXIT|[6]|System.JSON.serialize(Object)
12:24:15.076 (76889916)|SYSTEM_MODE_EXIT|false
12:24:15.077 (77131149)|FATAL_ERROR|System.JSONException: Salesforce System Error: 2043493233-942 (717264018) (717264018)

(System Code)
Class.TestController.saveForm: line 6, column 1
12:24:15.077 (77204398)|CODE_UNIT_FINISHED|VFRemote: TestController invoke(saveForm)
12:24:15.079 (79569009)|EXECUTION_FINISHED


Visualforce Page
  
<apex:page controller="TestController" applyBodyTag="false">
    <head>
        <title>Test</title>
        <script type="text/javascript">
            function buildFormData() {
                var form = {};
                form.config = {};
                form.config.pages = [];
                var page = {};
                page.rows = [];
                var row = {name: 'Account Row'};
                page.rows.push(row);
                row = {name: 'Contact Row'};
                page.rows.push(row);
                form.config.pages.push(page);

                form.config.baseobjects = [];
                var baseObj = {name: 'Contact'};
                form.config.baseobjects.push(baseObj);
                baseObj = {name: 'Account'};
                form.config.baseobjects.push(baseObj);
                return form;
            }

            function saveForm(){
                var formData = buildFormData();
                Visualforce.remoting.Manager.invokeAction('{!$RemoteAction.TestController.saveForm}', 
                    formData, function(result, event) {
                        if(event.status) {
                            console.log(result);
                        } else {
                            alert('Error: ' + event.message);
                        }
                    }, {buffer: false, escape: false, timeout: 30000}
                );
            }
        </script>
    </head>
    <body>
        <div>
            <h2>Send object and get json string.</h2>
            <br />
            <button onclick="saveForm()">Save Form</button>
        </div>
    </body>
</apex:page>



Controller
  
global with sharing class TestController {

    @RemoteAction
    global static String saveForm(FormData data) {
        System.debug('## data ' + data.config);
        // it crashes on JSON.serialize
        return JSON.serialize(data.config);
    }

    global class FormData {
        public Map<String, Object> config {get; set;}

        public FormData() {
            config = new Map<String, Object>();
        }
    }
}



The following error occurs on JSON.serialize call
FATAL_ERROR|System.JSONException: Salesforce System Error: 2043493233-942 (717264018) (717264018)

Any help is appreciated.
Thanks
4 replies

VF error : cannot convert value to the expected type

I have been stuck with this for over a day.

 

I am using a component. that was obtained from an unmanaged package,  in my visualforce page. It is complaining that one of the attributes is not getting the right type for its parameter.

 

Following is the attribute definition and controller variable

 

 

  <apex:attribute name="leftOptions"
    description="Options list for left listbox." type="SelectOption[]"
    required="true" assignTo="{!leftOptions}" />

 

public SelectOption[] leftOptions { get; set; }

 

In my VF page, this is how I have been using it and the corresponding extension code

 

My VF:

                    <apex:column headerValue="Dates of Service" >
                        <apex:variable var="dos1" value="{!s.multiLineEdit_tag__c}"/>                        
                        <c:MultiselectPicklist leftLabel="" leftOptions="{!leftOptionList[dos1]}" rightLabel="" rightOptions="{!rightOptionlist[dos1]}"  size="5" width="150px"/>                                
                     </apex:column>   

 

My Controller:

    public List <SelectOption[] > leftSideOptions = new List <List<SelectOption> >();   
    public List<SelectOption[] > getleftOptionList()
    {
        system.debug('leftSideOptions'+leftSideOptions);
        return leftSideOptions;
    }

 

It throws me a VF error as:

Cannot convert the value of '{!leftOptions}' to the expected type.

 


Could someone guide me as to what I am doing wrong?

 

Thank you.

  • November 20, 2012
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