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copied!<p>Have a look at the <a href="http://code.google.com/p/json-simple/wiki/EncodingExamples" rel="noreferrer">examples</a> of <code>JSON-simple</code>.</p> <p>It says here that you need to put the Objects one by one into the Array, using only <code>primitive</code> and <code>String</code> values. You may use <code>Collections</code> like <code>Map</code> that by themselves only contain <code>String</code> or <code>primitive</code> values.</p> <pre><code> JSONArray list = new JSONArray(); list.add("foo"); list.add(new Integer(100)); list.add(new Double(1000.21)); list.add(new Boolean(true)); list.add(null); StringWriter out = new StringWriter(); list.writeJSONString(out); </code></pre> <p>So, adding your <code>Services</code> is not allowed and won't work. You should add a <code>toMap</code> method in it where you convert it to a <code>Map</code> and <code>fromMap</code> to convert it back.</p> <p>Like this (in <code>Services.java</code>):</p> <pre><code> public Map toMap() { HashMap<String, String> serviceAsMap = new HashMap<>(); servicesAsMap.put("serviceName", serviceName); servicesAsMap.put("className", this.class.getName() + ".class"); servicesAsMap.put("isEnabled", isEnabled); // ... continue for all values return servicesAsMap; } </code></pre> <p>then you can use that <code>Map</code> to populate your <code>JSONArray</code> like this:</p> <pre><code> JSONArray servicesJSON = new JSONArray(); ArrayList<Service> servicesArray = this.getServices(); for(int i=0; i< servicesArray.size(); i++) { servicesJSON.add(servicesArray.get(i).toMap()); // use the toMap method here. } obj.put("services", servicesJSON); </code></pre>

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