无法在Groovy / Java中编写JSON字符串

Question

So I am trying to write the following JSON as a Java string but getting an error I don't understand:

    String simpleAPI_MessageInJSON = "{                                          " +
                                 "       \"action\": \"add\",                    " +
                                 "       \"destinations\": {                     " +
                                 "           \"cache\": 1,                       " +
                                 "           \"batches\": 1                      " +
                                 "        },                                     " +
                                 "       \"payload\": {                          " +
                                 "           \"object_type\": \"profile\",       " +
                                 "           \"object_id\": 366334,              " +
                                 "        }                                      " +
                                 "    }                                          ";

ERROR:

com.fasterxml.jackson.core.JsonParseException: Unexpected character ('}' (code 125)): was expecting double-quote to start field name

Answer 1

You have an extra comma:

"           \"object_id\": 366334,              " +

Should be:

"           \"object_id\": 366334              " +
//                              /\ Extra comma was there.

The error message says:

com.fasterxml.jackson.core.JsonParseException: Unexpected character ('}' (code 125)): was expecting double-quote to start field name

This isn't very clear, but we can make out that it's a syntax error of some kind, and it has a line number. By looking around the line number, you can find the syntax error.

Answer 2

It's generally easier to use multi-line strings if you are using groovy for improved readability:

String simpleAPI_MessageInJSON = '''{                                          
                                   |    "action": "add",
                                   |    "destinations": {
                                   |        "cache": 1,
                                   |        "batches": 1
                                   |    },
                                   |    "payload": {
                                   |        "object_type": "profile",
                                   |        "object_id": 366334
                                   |    }
                                   |}'''.stripMargin()

Answer 3

@Annubian Noob

Strange, works with groovy:

import groovy.json.JsonSlurper

String simpleAPI_MessageInJSON = "{                                          " +
                                 "       \"action\": \"add\",                    " +
                                 "       \"destinations\": {                     " +
                                 "           \"cache\": 1,                       " +
                                 "           \"batches\": 1                      " +
                                 "        },                                     " +
                                 "       \"payload\": {                          " +
                                 "           \"object_type\": \"profile\",       " +
                                 "           \"object_id\": 366334,              " +
                                 "        }                                      " +
                                 "    }  "
def parsed = new JsonSlurper().parseText(simpleAPI_MessageInJSON)
assert parsed.action == "add"