« Integrating Java and Flex with a simple RPC example | Main | Passing complex parameters and results »
August 04, 2006
Calling Java remote objects and handling results
In my previous coffee break guide we got a flex app talking to some java on the server. I'm guessing you are all happy with how the java works, but a quick explanation of how we called the java and how we handled the results would be useful.
If you take a look at EchoView.mxml, there are a number of 'features' I would like to describe to you. The mxml file itself will be compiled by the flex compiler into a .swf file, which is the binary which will run in the browser ( a flash movie ). The mxml in this file is derived from an mx:Application tag, for the purposes of this discussion, think of this as the 'entry point' of the client application. You will see there is some view code, which is made up of various controls such as buttons and text inputs and some layout code, such as HBox. I will not discuss this layout code in any more detail, I'm sure you guys can figure it out, but if not, take a look at the docs.
Next is the code which allows us to hook onto the server and make our RPC call, this is declared inside the RemoteObject tag:
<mx:RemoteObject
id="echoRO"
destination="echoService"
fault="handleFault(event)"
result="handleResult(event)" />
The id is just our instance name for an instance of RemoteObject, the destination points to the remote destination which is configured in our remoting-config file:
<destination id="echoService">
<properties>
<source>fdsweb.EchoService</source>
<scope>application</scope>
</properties>
</destination>
The fault and result properties are in fact event handlers and they point to functions which will handle the events, as you can see, they also pass in the event as a parameter. The fault event occurs when something goes wrong, including exceptions in the server java code, i.e. our remote object. The result event (hopefully) will be called most of the time, this points to the function which will handle successful results from the remote objects. The flex gateway (the code in the WAR file) translates standard java parameters and return types to standard flex parameters and return types, as described here:
Java to ActionScript
ActionScript to Java
On a real project, we would use the Cairngorm microarchitecture to abstract out our remote objects into a ServiceLocator, but as we are just wanting to play, lets just go with declaring the remote object in our mxml entry point file.
You will notice that the event handling code in the MXML file is written in action script and as such is declared in an mx:Script tag. The functions handleResult and handleFault are the same functions which we point our remote object event handlers to, handleClear describes what happens when the user clicks on the clear button (note the button has a click event handler which is pointing to this function) and finally handleSend describes what happens when the user clicks on the send button, apart from doing some trivial view stuff, this function calls the remote object:
echoRO.echo(message);
any method which is exposed on the remote java object can be called by the actionscript code (subject to security), as long as it passes a compatible parameter, see the docs for type mapping. The most important thing you will need to get your head around is that you do not assign the return of the remote method from the result of the call, in other words you do not assign it in the handleSend function. Remote object calls are asynchronous, so the client continues working in parallel to the server handling the method call, the result appears as an event on the remote object, which is handled as I mentioned earlier by the 'result' or 'fault' events on the remote object, which in our case point to handleResult and handleFault functions.
It is important to remember that the request and the response are asynchronous, so if you made request-A and then request-B you are likely to receive response-A and response-B, however, there is no guarantee and you could receive response-B and then response-A; see Asynchronous Call Token for a typical way of matching requests to responses if you need to.
As you are probably starting to work out, using the current techniques above, you would be limited to only using java parameters and return types which are mapped; fortunately however, Flex allows us to create complex objects which we can pass back and forth, often these objects are known as Data Transfer Objects or Value Objects, however, ultimately they are just objects.
In the next coffee-break guide, I will show how you can pass your own custom object to from flex to java and also a custom object from java to flex.
Posted by dharfleet at August 4, 2006 05:00 PM
Comments
Hi All,
Very good tutorial. Enjoyed a lot implementing.
I am getting error "Client.Error.MessageSend". Could some one help to to debug througth this error.
Thanks,
Parag
Posted by: Parag at February 15, 2007 09:58 AM
Hi. I am getting a strange problem. I have installed Flex 2 SDK for eclipse and updated to 2.01.
ANY FDS2 project I create shows from the start the following errors:
1023 Incompatible Override
1120 Access of undefined property IFlexModule
1144 Interface method create in namespace mx.core:IFlexModuleFactory is implemented in class xxx_SystemManager
1172 Definition IFlexModule could not be found
Could you please help me ? What is this ? How do I fix these Errors ?
I googled and it was said that it has something to do with a wrong update package from Adobe, but thats my third try to download, install and reinstall.
Does that have somthing to do with the FDS2 Express Edition ?
I am using JDK1.5, JBoss4.0.4 and Eclipse 3.2.
I am really desperate for help since I need this working for a running project...
PLEASE, PLEASE HELP :)
Sincerely yours
Amir Rocker
Posted by: amir at March 19, 2007 01:30 PM
I have a webservice that can be consumed via either the WSDL or via a Java wrapper class in Flex. As a developer that is new to Flex I have been trying to work out the best way of consuming the webservice.
So far I have determined that you can consume a webservice:
a) directly in MXML via the appropriate tags, however as the WSDL needs to be almost completely mapped here it seems impractical when you have large WSDL definitions to map to.
b) via actionscript, which to be honest I have not been able to get working as of yet.
c) using remote objects with the Java wrapper I mentioned previously.
Aside from which I have just stated what would be the pros/cons of each method?
Many thanks in advance.
Posted by: BlackDhalia at May 10, 2007 05:00 PM
ok
Posted by: Almousjbuiui at May 11, 2007 06:00 PM
In FDSWeb folder ---- > you have WEB-INF folder ------> in that classes ---- > copy the folder(fdsweb) and paste into fdsweb.war---->WEB-INF--->classes
Try this it will run properly.i executed the code..it is working fine......
Thanks,
Megharaja S.H.
Posted by: Megharaja S.H. at July 26, 2007 08:48 AM
I am testing a very simple call, but i am getting the next error : the 'Data' service can only process messages of type 'DataMessage'.
Posted by: Bacca at October 26, 2007 11:03 PM
Hai very nice tutorial but i wish that u can give an example of jsp with flex sending and receiving data
thanks in advance!!!
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This is impressive because it's about two years old and still quite relevant (in my opinion.) Two years later, though, and Flex is definitely taking off –- yet, there's still a lot more required before it becomes really common place. I'm hoping that Adobe making a big deal out of AIR will make all of the potential we've seen from Flex and Apollo etc. come to light and enter the mainstream very soon. To be honest, I'm getting a little bored of where things are right now – we need to see something really big happen.
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I'm using both the remoteObject and remoteClass features of Flex and have a basic question.
In some of the Java classes that I am calling they have methods inside of them that I am using the remoteObject to call. However they also contain information on the data types that are being passed and for this I am using the remoteClass to map my classes in Flex with the classes in Java.
Is there a way to access methods in the Java class using remoteClass?
So for instance I have a Java class that looks like the following.
public class User {
private String username;
private String user_type;
private String password;
etc...
public String getUsername(){
return this.username;
}
public void setUsername(String str){
this.username = str;
}
etc...gets and sets
public void insertUser(){
//Performs the insert to the database using
// this.username, this.user_type etc...
}
I know I could pass in the User to the insertUser method using a RemoteObject but I would like to not have to pass in that data and just use the methods in the existing class without having to split up the methods into a UserDAO class on the Java side. Is this possible or recommended?
Thanks
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