JSON RPC: java method never called, any ideas?

Question

Hi all,

I'm trying to get some code working that a previous developer has written. Yep, his now left the company. :-(

I have a JSON RPC call being made from the JS code. The JS all runs fine & the callback method gets an object back (not an error object).

But the method on the Java class never gets hit. The smd method does get hit though.

---

public String smd()
{
return SUCCESS; // break point reaches here
}

@SMDMethod
public void updateRowValueForField(String key, String value, String fieldname)
{
// We never get into this method.
}

---

Blockquote

<action name="ebToggleSelection" class="eboggleSelectionAction" method="smd">
  <interceptor-ref name="jsonStack">
    <param name="enableSMD">true</param>
  </interceptor-ref>
  <result type="json">
    <param name="enableSMD">true</param>
  </result>
</action>

---

I'm stumpped as to why, or what I'm missing. I've read JSON plugin page over and over.

I think I just need another set of eyes.

Note: no errors in the Tomcat console, no JS errors.

Anyone got any clues? Cheers Jeff Porter

Answer 1

I'm guessing that you need to update the smd() method to actually call updateRowValueForField() rather than simply return immediately. Looks like the previous developer never actually hooked up the methods.

Answer 2

You forgot to include the javascript code. From the example:

<s:url id="smdUrl" namespace="/nodecorate" action="SMDAction" />
<script type="text/javascript">
    //load dojo RPC
    dojo.require("dojo.rpc.*");

    //create service object(proxy) using SMD (generated by the json result)
    var service = new dojo.rpc.JsonService("${smdUrl}");

    //function called when remote method returns
    var callback = function(bean) {
        alert("Price for " + bean.type + " is " + bean.price);
    };

    //parameter
    var bean = {type: "Mocca"};

    //execute remote method
    var defered = service.doSomething(bean, 5);

    //attach callback to defered object
    defered.addCallback(callback);
</script>

Are you sure you call service.updateRowValueForField(key, value, fieldname) and not something different?

Further, your method returns a void (e.g. doesn't return anything). What did you expect to get?

Answer 3

Thanks for the replys.

My JS code is pretty much as above...

function updateRowValue(action, key, value, fieldname, callback)
{
//load dojo RPC
dojo.require("dojo.rpc.*");

//create service object(proxy) using SMD (generated by the json result)
var service = new dojo.rpc.JsonService(action);

//execute remote method
var defered = service.updateRowValueForField(("" + key), ("" + value), ("" + fieldname));

//attach callback to defered object
defered.addCallback(callback);
}

I didn't think that I had to link up the smd() method to call the updateRowValueForField() method. I presumed that the point is that it calls the updateRowValueForField() on the class. Otherwise, how would it pass the parameters over?

Anyother ideas?

:-)

Jeff Porter

Answer 4

ahhh!!!!!

Its a firefox 3 & Struts 2.09 thing!!

dojo forum post

I've still no idea how to fix it, anyone?

:-)

Answer 5

New version fixes my problems.

Google JSON plugin