[FLEX-35323] NullPointerException when setting property of <fx:Object/> with binding

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Apache FalconJX 0.7.0, Apache FalconJX 0.8.0
• Fix Version/s: Apache FalconJX 0.8.0
• Component/s: Falcon
• Assignee: Josh Tynjala
• Reporter: Josh Tynjala
• Created: 07/Jun/17 14:38
• Updated: 07/Jun/17 16:37
• Resolved: 07/Jun/17 16:37

Description

Using the following code:

src/InternalError.mxml

<?xml version="1.0" encoding="utf-8"?>
<js:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
	xmlns:js="library://ns.apache.org/flexjs/basic"
	xmlns:local="*">
	<fx:Declarations>
		<fx:Object test="{MY_CONST}"/>
	</fx:Declarations>
	<js:initialView>
		<js:View>
			<js:Label id="label" text="Hello World" x="100" y="100"/>
		</js:View>
	</js:initialView>
	<js:valuesImpl>
		<js:SimpleCSSValuesImpl />
	</js:valuesImpl>
	<fx:Script><![CDATA[
		public static const MY_CONST:String = "hello";
	]]></fx:Script>
</js:Application>

Compile with js/bin/mxmlc:

mxmlc src/InternalError.mxml

The following error will be included in the output:

InternalError.mxml Error: Internal error in ABC generator subsystem, when generating code for: /Users/joshtynjala/Development/NextGenAS/examples/HelloFlexJS/src/HelloFlexJS.mxml: java.lang.NullPointerException
	at org.apache.flex.compiler.internal.as.codegen.LexicalScope.getNameFromDefinition(LexicalScope.java:1178)
	at org.apache.flex.compiler.internal.as.codegen.LexicalScope.getBinding(LexicalScope.java:1069)
	at org.apache.flex.compiler.internal.codegen.databinding.BindingDestinationMaker.makeDestinationFunctionInstructionList(BindingDestinationMaker.java:131)
	at org.apache.flex.compiler.internal.codegen.databinding.BindingInfo.<init>(BindingInfo.java:114)
	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:4803)
	at org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processMXMLPropertySpecifier(MXMLClassDirectiveProcessor.java:3702)
	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.processMXMLObject(MXMLClassDirectiveProcessor.java:3014)
	at org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:919)
	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.processMXMLDeclarations(MXMLClassDirectiveProcessor.java:4132)
	at org.apache.flex.compiler.internal.as.codegen.MXMLClassDirectiveProcessor.processNode(MXMLClassDirectiveProcessor.java:977)
	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:876)
	at org.apache.flex.compiler.internal.units.CompilationUnitBase.access$300(CompilationUnitBase.java:109)
	at org.apache.flex.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase.java:313)
	at org.apache.flex.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase.java:309)
	at org.apache.flex.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:228)
	at org.apache.flex.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:222)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

Can reproduce with both FlexJS 0.7.0 and the latest 0.8.0 release branch nightly.

Simply setting the property without binding does not produce a NullPointerException.

Instead of using <fx:Object/>, if you switch to the following code, there is no NullPointerException:

<js:Label text="{MY_CONST}"/>

With that in mind, it may have something to do with the fact that the Object class is dynamic.