Re: signatures help

Hi Dave,

It's very clear that the problem is real.
The original code where I discovered the problem throws a ClassCastException and plainly shows that a java.lang.String cannot be cast to [Ljava.lang.String;
Its unambiguous ... even still, I wrote another test implementing your suggested technique just to be sure:

import java.util.Map;
import java.util.HashMap;

public class ParamActions{

    public static void main(String[] args){
        Map params = new HashMap();
        params.put("myArr", new String[]{"a", "b", "c"});
        System.out.println("passed in a String[] : " + storeParams(params));
    }
   
    public static boolean storeParams(Map params){

        boolean pass = false;
       
        try{
            if(params.get("myArr").getClass().equals(Class.forName("[Ljava.lang.String;"))){
                pass = true;
            }else if(params.get("myArr") instanceof java.lang.String[]){
                pass = true;
            }
        }catch(Exception e){
            e.printStackTrace();
        }

        return pass;
       
    }
}

The results are always the same ... called without DWR the method evaluates to true, with DWR it evaluates to false.
I've taken out all variables and am just testing from the debugging interface generated by DWR. I plugin {'myArr':["a","b","c"]} and it returns false.

Thanks again for trying to help,

Ty



----- Original Message ----
From: "david@..." <david@...>
To: users@...
Sent: Wednesday, April 23, 2008 4:57:23 PM
Subject: Re: [dwr-user] signatures help

I understand that you this is your test for DWR. Have you ever thought the
Java code you have written is not correct (it doesn't look correct to me)
and that DWR is passing everything correctly?  I can assure you that this
is a very common feature and DWR fully supports it and it works correctly.

Write a test for your method in Java outside of DWR.  If you are not
familiar with junit/testng add a main method, create a test map and pass it
to your method.  

public static void main(String[] args) throws Exception {
    Map testMap = new HashMap();
    String[] newStringArr = {"A",    "B"    };
    testMap.put("myArr", newStringArr);
    System.out.println(storeParams(testMap));
}

Your test to see what is in the map does not seem correct to me.  Try
something like:
if(params.get("myArr") instanceof java.lang.String[])






Original Message:
-----------------
From: tyju tiui jckdnk111@...
Date: Wed, 23 Apr 2008 13:30:16 -0700 (PDT)
To: users@...
Subject: Re: [dwr-user] signatures help


Hi Dave,

This is actually the test :-)
I'm testing to see if DWR is passing in a String[] and it isn't.

As another test, I tried passing in another hash object instead of an array
of strings and the result was the same ... DWR fills the container Map with
Strings regardless of what's passed in on the remote side.

I expect a Map<String, String[]> or in the second test a Map<String, Map>
but always receive Map<String, String>.

It seems the previously reported bug might actually be a bug
(http://getahead.org/bugs/browse/DWR-96)

Thanks again for your help,

Ty

----- Original Message ----
From: "david@..." <david@...>
To: users@...
Sent: Wednesday, April 23, 2008 1:59:26 PM
Subject: Re: [dwr-user] signatures help

Sorry, I missed that.  You still do not need signatures.  What you are
sending to your java method is fine.

It looks to me that your Java code and logic is at fault.  
1) Add a breakpoint to your Java method and debug it.
2) Write a test case and verify that the method performs as expected.

Original Message:
-----------------
From: tyju tiui jckdnk111@...
Date: Wed, 23 Apr 2008 10:41:39 -0700 (PDT)
To: users@...
Subject: Re: [dwr-user] signatures help


Hi Dave,

Thanks for the quick reply.
If you look closely at my original e-mail you'll see that I am, indeed,
sending a remote js hash.
It just so happens that the hash contains an array of strings.

Ty

----- Original Message ----
From: "david@..." <david@...>
To: users@...
Sent: Wednesday, April 23, 2008 1:24:05 PM
Subject: RE: [dwr-user] signatures help

1) Your Java method expects a Map not an Array.  To send a map you need to
send a JavaScript hash i.e {}, not a JavaScript array.
var sendThisToSever = {};
sendThisToServer["key1"] = "value1"

or:
var sendThisToServer = new Object();
sendThisToServer.key1 = "value1";

2) You do not need signatures since your map only contains Strings.  That
is just a warning message.  It is letting you know that DWR is assuming
that the contents of the Map  are Strings which in your case is correct.

Original Message:
-----------------
From: tyju tiui jckdnk111@...
Date: Wed, 23 Apr 2008 10:19:46 -0700 (PDT)
To: users@...
Subject: [dwr-user] signatures help


Hi,

I'm having trouble sending a remote array of strings to a DWR-exposed
method which expects a Map.

js:
var params = { 'myArr':["a", "b", "c"] };

java:
public class ParamActions{
    public static boolean storeParams(Map params){
        if(params.get("myArr").getClass().getClass().equals(Class.forName("[
Ljava.lang.String;"))){
            return true
        }else{
            return false;
        }
    }
}

When invoked by DWR, the java code always evaluates to false since the
Object returned by params.get("myArr") is a String and not a String[].
I found the following bug report describing a similar problem:
http://getahead.org/bugs/browse/DWR-96
It says the problem has been fixed in version 3M2 ... is this stable enough
to use?

Also, I see some warning in the DWR log talking about "Missing type info
for storeParams(1<0>). Assuming this is a map with String keys. Please add
to <signatures> in dwr.xml".

I added the following to my dwr.xml but I'm still getting the errors:

...
</allow>
  <signatures>
    <![CDATA[
        import java.util.Map;
        import test.dwr.ParamActions;
        ParamActions.storeParams(Map<String,[Ljava.lang.String;>);
    ]]>
  </signatures>
</dwr>

I'm hoping if I can get the signatures section setup correctly then maybe
my String[] will start magically working.

Thanks,

Ty



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