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https://issues.apache.org/jira/browse/FLEX-35190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724866#comment-15724866
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Santanu Karar edited comment on FLEX-35190 at 12/6/16 9:59 AM:
---------------------------------------------------------------

Hello Alex,

I've updated the patch file, sorry for the trouble. 

Yes, after adding that default property metadata, I did build it's 'swc' and 
tested locally. This worked fine after that addition. I noticed I thrown by the 
said error when my MXML implementation was almost empty even:
{code}
<js:DataItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009";
                                xmlns:js="library://ns.apache.org/flexjs/basic">
</js:DataItemRenderer>
{code}

I'm not sure about what binding expression problem you've noticed, though.


was (Author: santanu4ver):
Hello Alex,

I've updated the patch file, sorry for the trouble. 

Yes, after adding that default property metadata, I did build it's 'swc' and 
tested locally. This worked fine after that addition. I noticed I thrown by the 
said error when my MXML implementation was almost empty event:
{code}
<js:DataItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009";
                                xmlns:js="library://ns.apache.org/flexjs/basic">
</js:DataItemRenderer>
{code}

I'm not sure about what binding expression problem you've noticed, though.

> [FlexJS] DataItemRenderer breaks if extends as MXML file
> --------------------------------------------------------
>
>                 Key: FLEX-35190
>                 URL: https://issues.apache.org/jira/browse/FLEX-35190
>             Project: Apache Flex
>          Issue Type: Bug
>    Affects Versions: Apache FlexJS 0.8.0
>            Reporter: Santanu Karar
>         Attachments: devsena.patch
>
>
> I took a nightly build of Apache FlexJS and tried by it's supplied 
> *DataGridExample* example project. The example used a custom DataItemRenderer 
> class, but it was an ActionScript implementation. 
> When I tried to create MXML file extending same DataItemRenderer class, when 
> used to DataGrid component, I couldn't even able to build but thrown by 
> compiler error:
> *1551: Internal error in ABC generator subsystem, when generating code for: 
> E:\apache-flex-flexjs-0.8.0-bin\examples\flexjs\DataGridExample\src\products\ProductItemRendererMXML.mxml:
>  java.lang.NullPointerException*
> I'm attaching herewith the full error details for your review:
> {panel}
> Description   Resource        Path    Location        Type
> 1551: Internal error in ABC generator subsystem, when generating code for: 
> E:\apache-flex-flexjs-0.8.0-bin\examples\flexjs\DataGridExample\src\products\ProductItemRendererMXML.mxml:
>  java.lang.NullPointerException
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.BindingInfo.analyzeExpression(BindingInfo.java:488)
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.BindingInfo.finishInit(BindingInfo.java:171)
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.BindingInfo.<init>(BindingInfo.java:115)
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.BindingAnalyzer.analyze(BindingAnalyzer.java:56)
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.BindingDatabase.analyze(BindingDatabase.java:122)
>       at 
> org.apache.flex.compiler.internal.codegen.databinding.MXMLBindingDirectiveHelper.visitNode(MXMLBindingDirectiveHelper.java:116)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLDataBinding(MXMLClassDirectiveProcessor.java:4797)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLPropertySpecifier(MXMLClassDirectiveProcessor.java:3696)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:962)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:831)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLInstance(MXMLClassDirectiveProcessor.java:3349)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:939)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:831)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLArray(MXMLClassDirectiveProcessor.java:3088)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:926)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLPropertySpecifier(MXMLClassDirectiveProcessor.java:3605)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:962)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:831)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLInstance(MXMLClassDirectiveProcessor.java:3349)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:939)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:831)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLArray(MXMLClassDirectiveProcessor.java:3088)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:926)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLPropertySpecifier(MXMLClassDirectiveProcessor.java:3605)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:962)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:861)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.traverse(MXMLClassDirectiveProcessor.java:831)
>       at 
> org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMainClassDefinitionNode(MXMLClassDirectiveProcessor.java:653)
>       at 
> org.apache.flex.compiler.internal.as.codegen.GlobalDirectiveProcessor.declareMXMLDocument(GlobalDirectiveProcessor.java:518)
>       at 
> org.apache.flex.compiler.internal.as.codegen.DirectiveProcessor.processNode(DirectiveProcessor.java:232)
>       at 
> org.apache.flex.compiler.internal.as.codegen.DirectiveProcessor.traverse(DirectiveProcessor.java:188)
>       at 
> org.apache.flex.compiler.internal.as.codegen.ABCGenerator.generate(ABCGenerator.java:122)
>       at 
> org.apache.flex.compiler.internal.units.MXMLCompilationUnit.handleABCBytesRequest(MXMLCompilationUnit.java:199)
>       at 
> org.apache.flex.compiler.internal.units.CompilationUnitBase.processABCBytesRequest(CompilationUnitBase.java:866)
>       at 
> org.apache.flex.compiler.internal.units.CompilationUnitBase.access$300(CompilationUnitBase.java:107)
>       at 
> org.apache.flex.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase.java:309)
>       at 
> org.apache.flex.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase.java:305)
>       at 
> org.apache.flex.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:228)
>       at 
> org.apache.flex.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:222)
>       at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
>       at java.util.concurrent.FutureTask.run(Unknown Source)
>       at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown 
> Source)
>       at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
>       at java.lang.Thread.run(Unknown Source) ProductItemRendererMXML.mxml    
> /DataGridExample/src/products   line 0  Flex Problem
> {panel}
> The MXML custom renderer class was simple:
> {code}
> <js:DataItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009";
>                               xmlns:js="library://ns.apache.org/flexjs/basic">
>     <fx:Script>
>         <![CDATA[
>                       import org.apache.flex.html.Label;
>                       import 
> org.apache.flex.html.supportClasses.DataItemRenderer;
>               ]]>
>     </fx:Script>
>       <js:Container width="100%" height="100%">
>               <js:Label id="output" width="100" text="{data.image}" />
>       </js:Container>
> </js:DataItemRenderer>
> {code}



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