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Editorial Team
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Asked: 2026-05-28T04:26:35+00:00

I’m reading an array of JSON objects from an API, and hope to use

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I’m reading an array of JSON objects from an API, and hope to use Mustache to display the data in a nice HTML format.

I downloaded the pre-built .jar file from https://github.com/samskivert/jmustache, and ran the hello world with no problem:

String text = "One, two, {{three}}. Three sir!";
Template tmpl = Mustache.compiler().compile(text);
Map<String, String> data = new HashMap<String, String>();
data.put("three", "five");
Log.d("json",tmpl.execute(data));

How do I feed my JSONObject to Mustache?

I tried this:

JSONObject eventJSON = events.getJSONObject(event_count);
String text = "<h1>{{summary}}</h1>";
Template tmpl = Mustache.compiler().compile(text);
Log.d("this breaks", tmpl.execute(eventJSON));

Logcat says "No key, method or field with name 'summary' on line 1"

I get the same error when sending a JSON string:

Log.d("this breaks", tmpl.execute(eventJSON.toString()));

eventJSON.toString() results in a really long string that starts

{"summary":"the LUSTER a.k.a. VJ WADAKENによるウィークデーモンスターパーティー。\r\n","invitations":[],"genres":[1,2],"open_date":"2011-11-17"...

Do I have to convert the JSON to a hash?

Logcat full error:

11-17 12:04:19.080: E/AndroidRuntime(17227): FATAL EXCEPTION: AsyncTask #2
11-17 12:04:19.080: E/AndroidRuntime(17227): java.lang.RuntimeException: An error occured while executing doInBackground()
11-17 12:04:19.080: E/AndroidRuntime(17227):    at android.os.AsyncTask$3.done(AsyncTask.java:266)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.lang.Thread.run(Thread.java:1020)
11-17 12:04:19.080: E/AndroidRuntime(17227): Caused by: com.samskivert.mustache.MustacheException: No key, method or field with name 'summary' on line 1
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.samskivert.mustache.Mustache$VariableSegment.execute(Mustache.java:520)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.samskivert.mustache.Template.executeSegs(Template.java:70)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.samskivert.mustache.Template.execute(Template.java:58)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.samskivert.mustache.Template.execute(Template.java:48)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.example.android.events.AsyncJSONEventParser.parseEventJSON(AsyncJSONEventParser.java:88)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.example.android.events.AsyncJSONEventParser.doInBackground(AsyncJSONEventParser.java:40)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at com.example.android.events.AsyncJSONEventParser.doInBackground(AsyncJSONEventParser.java:1)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at android.os.AsyncTask$2.call(AsyncTask.java:252)
11-17 12:04:19.080: E/AndroidRuntime(17227):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
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1 Answer

  1. Editorial Team

    The json can’t be used as a string and does need to be a hash… I do that like so with Jackson. See this post about jackson parsing in 5 minutes

    @SuppressWarnings("unchecked")
protected void parseJsonString(String json){
    try {
        ObjectMapper mapper = new ObjectMapper();
        //Object root = mapper.readValue(json, Object.class);
        //Map<String,String> rootAsMap = mapper.readValue(json, Map.class);
        //rails 3.0.3 is bad and doesn't qoute strings
        userData = (Map<String,Object>) mapper.readValue(json, Map.class);
    } catch (JsonParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (JsonMappingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
}
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