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This is a test
Create the object you want to convert :
Map map = new HashMap(); map.put("key1", new String[] { "value1-1", "value1-2" }); map.put("key2", new String[] { "value2-1", "value2-2" }); map.put("key3", null); map.put("key4", new String[] { null, null }); map.put(null, new String[] { "value5-1", "value5-2" });