Thread: Re: [json-lib-user] What causes: Property 'x' has no read method. SKIPPED?

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Hi Christopher,

Json-lib relies on PropertyDescriptors to find which properties may be serialized into JSON.
In your case there is a class that has a write-only property name geometryN (usually it just
has a setter method). Perhaps the property descriptor for 'geometryN' is actually for an indexed
property and not a regular one. Without a proper bounded limit for that indexed property it may 
be hard to retrieve any values.

I agree that the message is not quite clear on which class is the owner of that property, I'll fix that 
for the next release. Let me think what can be done with indexed properties, you can tweak the
serialization process with JsonValueProcessors or JsonBeanProcessors for the time being.

Cheers,
Andres

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----- Original Message ----
From: Christopher Hunt <hu...@in...>
To: jso...@li...
Sent: Saturday, June 28, 2008 10:55:34 PM
Subject: [json-lib-user] What causes: Property 'x' has no read method. SKIPPED?

Hi there,

Thanks for providing JSON-LIB. I think that it is great.

I have received the following warning in my logs:

WARN  2008-06-29 14:30:20,999 [connector.stdio.0.dispatcher.1]  
net.sf.json.JSONObject: Property 'geometryN' has no read method. SKIPPED

Can you please shed some more light on what conditions cause the  
message to appear?

Additionally is there a means to determine the class that is actually  
causing the problem?

I'm using the Java Topology Suite and can only see two instances of  
its Geometry type in my code (there is a public getGeometryN(int n)  
method associated with the Geometry class). I also have the following  
setup for JSON-LIB which really should capture Geometry conversions:

   JsonConfig jsonConfig = new JsonConfig();
   jsonConfig.registerJsonValueProcessor(Coordinate.class,
     new JsonValueProcessor() {
       public Object processArrayValue(Object arg0, JsonConfig arg1) {
       Coordinate coord = (Coordinate) arg0;
       return "{x:" + coord.x + ",y:" + coord.y + ",z:"
         + coord.z + "}";
       }

       public Object processObjectValue(String arg0, Object arg1,
         JsonConfig arg2) {
       return processArrayValue(arg1, arg2);
       }
     });
   jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.NOPROP);
   jsonConfig.setJsonPropertyFilter(new PropertyFilter() {
     public boolean apply(Object source, String name, Object value) {
     boolean filterOut = false;
     if (source instanceof Geometry) {
       filterOut = (!name.equals("coordinates") && !name
         .equals("SRID"));
     }
     return filterOut;
     }
   });
   JSONObject jsonObject = JSONObject.fromObject(this, jsonConfig);
   return jsonObject.toString();

Help is appreciated.

Cheers,
-C

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