Flex 4 App Blank

Question

I'm building a Flex 4 app (using flexmojos rather than FlexBuilder). If I create a test Applications as follows, using mx:Application, then I see a button as I would expect:

<mx:Application
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="http://www.adobe.com/2006/mxml">

    <s:Button
        label="Button"/>

</mx:Application>

However, if I use s:Application then all I see is a blank (white) screen:

<s:Application
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="http://www.adobe.com/2006/mxml">

    <s:Button
        label="Button"/>

</s:Application>

Incidentally I am not currently using an html wrapper, I'm just loading the swf directly in the browser.

Here is my pom...

<project 
    xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.aaa.bbb</groupId>
    <artifactId>app</artifactId>
    <packaging>war</packaging>
    <version>2.0-SNAPSHOT-1</version>
    <name>app</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <build>
        <sourceDirectory>src/main/flex</sourceDirectory>
        <testSourceDirectory>src/test/flex</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.sonatype.flexmojos</groupId>
                <artifactId>flexmojos-maven-plugin</artifactId>
                <version>3.9</version>
                <dependencies>
                    <dependency>
                        <groupId>com.adobe.flex</groupId>
                        <artifactId>compiler</artifactId>
                        <version>4.5.0.20967</version>
                        <type>pom</type>
                    </dependency>
                </dependencies>
                <extensions>true</extensions>
                <configuration>
                    <policyFileUrls>
                        <url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</url>
                    </policyFileUrls>
                    <rslUrls>
                        <url>http://fpdownload.adobe.com/pub/{extension}/flex/4.5.0.20967/{artifactId}_{version}.{extension}</url>
                    </rslUrls>
                </configuration>
                <executions>
                    <execution>
                        <id>flex-compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile-swf</goal>
                        </goals>
                        <configuration>
                            <output>src/main/webapp/Main.swf</output>
                        </configuration>                        
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>textLayout</artifactId>
          <version>4.5.0.20967</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>framework</artifactId>
          <version>4.5.0.20967</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>spark</artifactId>
          <version>4.5.0.20967</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>sparkskins</artifactId>
          <version>4.5.0.20967</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>rpc</artifactId>
          <version>4.5.0.20967</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>datavisualization</artifactId>
          <version>4.5.0.17855</version>
          <type>swc</type>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>com.adobe.flex.framework</groupId>
          <artifactId>flex-framework</artifactId>
          <version>4.5.0.20967</version>
          <type>pom</type>
        </dependency>
    </dependencies>

</project>

Anybody know what I am doing wrong? Thanks

UPDATE:

I now have all the RLSs as .swz files stored in the same location as the .swf file, and I have the RSL URLs set as follows:

                            <configuration>
                    <policyFileUrls>
                        <url>http://fpdownload.adobe.com/pub/swz/crossdomain.xml</url>
                    </policyFileUrls>
                    <rslUrls>
                        <url>{artifactId}_${flex.sdk.version}.{extension}</url>
                    <url>http://fpdownload.adobe.com/pub/{extension}/flex/${flex.sdk.version}/{artifactId}_${flex.sdk.version}.{extension}</url>
                    </rslUrls>
                </configuration>

Still, the app is just blank. Using FireBug there don't seem to be any requests for any RSLs that I can see, neither are there any error messages pertaining to this. It seems as though the RSL loading is not even attempted.

This is bizarre!

Answer 1

If you are on mojos < 4 add this to your configuration of your flexmojos-maven-plugin

<configuration>
    <configurationReport>true</configurationReport>
    <sourceFile>Main.mxml</sourceFile>
    <configFiles><!-- Fix for Mojos's < 4 -->
        <configFile>flex-config-swf-version-11.xml</configFile> 
    </configFiles> 
...

and then create this file

<?xml version="1.0"?> 
<flex-config> 
        <swf-version>11</swf-version> 
</flex-config> 

from: http://groups.google.com/group/flex-mojos/browse_thread/thread/143f69219fcddc16#

if you are on 4+ you can add this to your configuration

<configuration>
    <configurationReport>true</configurationReport>
    <sourceFile>Main.mxml</sourceFile>
    <swfVersion>11</swfVersion>
...

from: http://groups.google.com/group/flex-mojos/browse_thread/thread/9ff3ea2e0e0461a4