Invalid character constant JSON

Question

public class Test {

    public static void main(String[] args) throws ClientProtocolException, IOException {
    HttpClient client = new DefaultHttpClient();

    JSONObject json = new JSONObject();
    json.put('set_boot' : True);
    json.put('synchronous': True),
    json.put('filters',filterList);

    List filterList = new ArrayList();
    filterList.put(6005076802818994A0000000000009DD);

    json.put('volumes':volumeList);

    List volumeList = new ArrayList();
    volumeList.add('*all');

    json.add( 'allow_unsupported': True);
    StringEntity se = new StringEntity( json.toString());
    System.out.println(se);
   }
}

---

I am trying to add values to convert into a JSON query like:

{
    'set_boot': True,
    'synchronous': True,
    'filters': {
        'host_refs': [u '6005076802818994A0000000000009DD']
    },
    'volumes': ['*all'],
    'allow_unsupported': True
}

But Eclipse is giving me error Invalid Character constant on line

json.put('set_boot' : True);

I have tried writing a few other words also like

json.put('set' : True);

But it still gives me the same error.

Answer 1

If this is meant to be Java, you want:

json.put("set_boot", true);
json.put("synchronous", true);

(There are similar problems later on.)

Note:

• String literals are in double-quotes, not single-quotes in Java
• You're calling a method with two arguments - use a comma to separate the arguments
• The boolean true value in Java is true , not True . You could use "True" to set a string value if you want
• You're trying to use filterList before it's declared
• You're trying to call put on a List , when that method doesn't exist... you meant add
• Your literal of 6005076802818994A0000000000009DD is invalid. Did you mean to use a string literal?

These are all just matters of the Java language, and have nothing to do with JSON in themselves.

Answer 2

Besides your snytax errors in Java, your JSON example is invalid syntax as well. Check it using jsonlint or other services. It should look like the following:

{
    "set_boot": true,
    "synchronous": true,
    "filters": {
        "host_refs": [
            "6005076802818994A0000000000009DD"
        ]
    },
     "volumes": [
        "*all"
    ],
    "allow_unsupported": true
}