REST: Type of properties or variables in ApexClass.SymbolTable always null

[Szandor72]

Hey,

when retrieving ApeClasses with their Symbol Tables via

ToolingAPI.QueryResult qr = toolingApi.query('Select id,name, SymbolTable from ApexClass limit 1');

and looping through results, to retrieve properties and variables, I always get Type = null

Is that a known limitation of the REST version?

[afawcett]

Hmmm not sure, would not expect so, can you run this from anonymous apex prompt and capture the actual REST response, this will help determine if its a marshalling issue or not.

[Szandor72]

This is the REST response:

{  
   "size":1,
   "totalSize":1,
   "done":true,
   "queryLocator":null,
   "entityTypeName":"ApexClass",
   "records":[  
      {  
         "attributes":{  
            "type":"ApexClass",
            "url":"/services/data/v38.0/tooling/sobjects/ApexClass/01pA0000001AF1eIAG"
         },
         "Id":"01pA0000001AF1eIAG",
         "Name":"MultiAttachment",
         "SymbolTable":{  
            "constructors":[  
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":9,
                     "line":11
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"MultiAttachment",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "type":null
               }
            ],
            "externalReferences":[  

            ],
            "id":"01pA0000001AF1eIAG",
            "innerClasses":[  

            ],
            "interfaces":[  

            ],
            "key":"01pA0000001AF1eIAG",
            "methods":[  
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":29,
                     "line":18
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"getAttachments",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "returnType":"LIST",
                  "type":null
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":14,
                     "line":27
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"addMore",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "returnType":"void",
                  "type":null
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":14,
                     "line":35
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"saveAttachment",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "returnType":"void",
                  "type":null
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":14,
                     "line":51
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"deleteAttachment",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "returnType":"void",
                  "type":null
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":23,
                     "line":59
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"done",
                  "parameters":[  

                  ],
                  "references":[  

                  ],
                  "returnType":"PageReference",
                  "type":null
               }
            ],
            "name":"MultiAttachment",
            "namespace":"ss33a",
            "parentClass":"",
            "properties":[  
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":12,
                     "line":2
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"sobjId",
                  "references":[  

                  ],
                  "type":"Id"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":26,
                     "line":3
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"attachments",
                  "references":[  

                  ],
                  "type":"LIST"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":26,
                     "line":4
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"newAttachments",
                  "references":[  

                  ],
                  "type":"LIST"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":12,
                     "line":6
                  },
                  "modifiers":[  
                     "public"
                  ],
                  "name":"idAttachmentDelete",
                  "references":[  

                  ],
                  "type":"Id"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":30,
                     "line":5
                  },
                  "modifiers":[  
                     "static",
                     "public",
                     "final"
                  ],
                  "name":"NUM_ATTACHMENTS_TO_ADD",
                  "references":[  

                  ],
                  "type":"Integer"
               }
            ],
            "tableDeclaration":{  
               "annotations":[  

               ],
               "location":{  
                  "column":30,
                  "line":1
               },
               "modifiers":[  
                  "public",
                  "without sharing"
               ],
               "name":"MultiAttachment",
               "references":[  

               ],
               "type":"MultiAttachment"
            },
            "variables":[  
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":16,
                     "line":29
                  },
                  "modifiers":[  

                  ],
                  "name":"idx",
                  "references":[  

                  ],
                  "type":"Integer"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":20,
                     "line":36
                  },
                  "modifiers":[  

                  ],
                  "name":"toInsert",
                  "references":[  

                  ],
                  "type":"LIST"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":19,
                     "line":37
                  },
                  "modifiers":[  

                  ],
                  "name":"newAtt",
                  "references":[  

                  ],
                  "type":"Attachment"
               },
               {  
                  "annotations":[  

                  ],
                  "location":{  
                     "column":20,
                     "line":52
                  },
                  "modifiers":[  

                  ],
                  "name":"lstAttDelete",
                  "references":[  

                  ],
                  "type":"LIST"
               }
            ]
         }
      }
   ]
}

the parsed queryresult returns for symbols

VisibilitySymbol:[Symbol.location=Position:[column=26, line=3], Symbol.modifiers=(public), Symbol.name=attachments, Symbol.references=(), Symbol.type_x=null, visibility=null]

Symbol.typ_x=null instead of "type":"LIST" as in the above response

[afawcett]

Ok so it is present in the response, and thus the problem is in the deserialisation from JSON to Apex. What I think i see is going on is this.

Since "type" is reserved word in Apex, it cannot be used as a variable name. When using the XML serialiser and deserialiser < type >xxxx< /type > gets automatically mapped to variables named "type_x" to work around this. Hence this might work ok for XML/SOAP version of the API (see main branch) but it looks like the JSON serialiser and deserialiser may not honour this convention.

So i did a bit of googling and found this. Which provides two possible solutions to this problem. The find/replace solution while simple might cause a performance impact depending on how many callouts your making i guess. So if your using the REST API, you could problem insert a line to do the find and replace in this method to try it. Let me know how it goes!

P.S. Sorry for the late reply, been a bit busy with moving and holiday time.

[Szandor72]

Happy new year Andrew, no worries!

thanks for your update, I'll report back asap.