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Asked: 2026-06-06T19:23:01+00:00

i have a json file with many elements like these: { code : hfuiew89,

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i have a json file with many elements like these:

{ 
"code" : "hfuiew89", 
"type" : "location", 
"coordinates" : [ { "lat" : 40.9861, "lon" : 29.1046, "index" : 1 }, 
          { "lat" : 40.9976, "lon" : 29.1153, "index" : 2 }, 
          { "lat" : 40.9809, "lon" : 29.2194, "index" : 3 }] 
}
{ 
"code" : "klsdsjh", 
"type" : "location", 
"relatedTags" : [ "kolmha" ], 
"coordinates" : [ { "lat" : 40.9808, "lon" : 29.1605, "index" : 1 }, 
              { "lat" : 40.9965, "lon" : 29.1672, "index" : 2 }] 
}

i want to read that file with gson but all examples i found are only for one element. therefore after reading the first one, throws ‘Expected EOF’ exception. how can i overcome this?

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1 Answer

  1. Editorial Team

    Greg is right, this is incorrect JSON, and you should try to generate valid JSON, that is prepend “[” at the beginning, append “]” at the end, and separate each element with a comma (“,”), so that it is a JSON array of JSON object.

    However, if you cannot change the format you have, consider it “a string containing a concatenation of well formed JSON fragments”. Approaching it that way, break the big string into smaller, valid json strings, and parse them one by one.

    To break the big string into single fragments you can simply count the brackets. With a “pre-parser” that copies stuff into a buffer (a StringBuilder?), increments a counter each time it encounters a “{“, decreases it each time it enouters a “}”, and if the counter is at zero pass the buffer string to gson for parsing, clear the buffer and go on to the end of the file.

    You can even use that pre-parser to convert it to valid json, simply appending a “,” when the counter reaches zero, and the passing everything to gson for a single parsing, but that could mean loading everything into ram, and I don’t know how big your file is.

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