Cannot Import Java Classes

Question

I am trying to do the sample contact walkthrough in FLEX
builder. For the Java Adapter.
http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/js/html/wwhelp.htm?href=00000138 .html
I cannot get any import statements to work for the java class
files. I have tried this using the FDS as a J2EE application
running in tomcat, I have tried with the standalone JRUN version of
the FDS app.
I have put the contact files everywhere I can think of, in
the server classes folder, in the project, in the default web
folder and nothing I try works. I have even setup the project to
compile on the server and I get nothing. Everytime, I get errors.
I did the tutorial from the JDJ magazine:
http://java.sys-con.com/read/210991.htm
I cant get that java connection to work either. Please
someone help me.
The flex code is below.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import mx.data.DataService;
import mx.collections.ArrayCollection;
import samples.contact.Contact;
public var ds:DataService;
[Bindable]
public var contacts:ArrayCollection;
//public var contact:Contact;
]]>
</mx:Script>
<mx:DataGrid id="dg" editable="true">
<mx:columns>
<mx:DataGridColumn dataField="contactId" headerText="Id"
editable="false"/>
<mx:DataGridColumn dataField="firstName"
headerText="First Name"/>
<mx:DataGridColumn dataField="lastName" headerText="Last
Name"/>
</mx:columns>
</mx:DataGrid>
</mx:Application>

Answer 1

Ken, thank you for replying, I have had absolutly nothing but
problems trying to get this 'simple' thing to work.
Here is my code.
In the remote-config.xml file, I have this code:
<?xml version="1.0" encoding="UTF-8"?>
<service id="remoting-service"
class="flex.messaging.services.RemotingService"
messageTypes="flex.messaging.messages.RemotingMessage">
<adapters>
<adapter-definition id="java-object"
class="flex.messaging.services.remoting.adapters.JavaAdapter"
default="true"/>
</adapters>
<default-channels>
<channel ref="my-amf"/>
</default-channels>
<destination id="SimpleJava">
<properties>
<source>javaSamples.SimpleMath</source>
</properties>
</destination>
</service>
Here is my MXML file: (Called new.MXML)
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:RemoteObject id="math" destination="SimpleJava">
<mx:method name="doMath" concurrency="last"
result="fillTxt(event.result as int)"/>
</mx:RemoteObject>
<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent
private function fillTxt(b: int):void{
txtResult.text = (String)
//comment
]]>
</mx:Script>
<mx:Panel x="10" y="24" width="250" height="200"
layout="absolute" title="Simple Math with Java">
<mx:Label x="10" y="10" text="Input Number to
Multiply:"/>
<mx:TextInput x="10" y="36" id="txtNumber"
maxChars="1"/>
<mx:Label x="10" y="126" id="txtResult"/>
<mx:Label x="10" y="100" text="Your Number will appear
below:"/>
<mx:Button x="10" y="66" label="Multiply by 2"
click="math.doMath(txtNumber.text)"/>
</mx:Panel>
</mx:Application>
Here is my SimpleJava.java file:
package javaSamples;
//import java.util.*;
* @author jsanders
public class SimpleMath {
public int doMath(String a){
int new_a = Integer.parseInt(a.trim());
int b = new_a * 2;
return b;
//changesd
Like I said I have had absolutly nothing but problems with
this. Yesterday, I was getting send failures, So I did some
reasearch found some folks who said that they had the same problem,
and they had to hard code the app name into the services-config.xml
file. The file used to have {context.root} in it, and that variable
was set to /flex, now I hardcoded this line into the my-amf channel
definition to get rid of the send failure error.
<channel-definition id="my-amf"
class="mx.messaging.channels.AMFChannel">
<endpoint uri="
http://{server.name}:{server.port}/flex/messagebroker/amf"
class="flex.messaging.endpoints.AMFEndpoint"/>
<properties>
<polling-enabled>false</polling-enabled>
</properties>
</channel-definition>
As you can see what should say:
http://{server.name}:{server.port}/{context.root}
Now says:
http://{server.name}:{server.port}/flex.
This was the only way I could get the send error to go away.
Now I worry that I might have broken something else. Since I
removed all references to {context.root} in that file.
{context.root} is defined in the flex-config.xml file, like
this:
<context-root>/flex</context-root>
I have tried it with or without the '/' in the value of the
context.root variable.
I have played with the remoting-config file, and I know that
I am accessing the destination.
I have played with the <source> option of the
destination, and I know that I am finding the class and making a
good connection.
I am using the JRUN install of FDS on my box, and yesterday
at the end of the day after getting the context.root situation
sorted out, I got a different error something like major.minor
versioning errors.
So the Java guys here at work told me that the JRUN version
packaged with FDS was 1.4, and I used 1.5 to compile my java class.
So I recompiled this morning with the 1.4 sdk. Now I dont get that
error about the major minor versioning anymore.
Now I get nothing. I use firefox, and all the browser tells
me is 'transferring data from localhost' Nothing else. It just sits
there and does nothing.
When I did the debug on it, I got into a loop on the
UIComponent.as file in the callLaterDispatcher(event:Event)
function.
Any clues what might be causing this new hang up. Basically
the machine just hangs. Is there a problem with the result from the
Method I am calling in the MXML? Did I do something wrong with the
Event as Int thing?
Again any help would be appreciated.