[FLEX-35324] NullPointerException when setting property of class that doesn't exist in fx namespace

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Apache FalconJX 0.7.0, Apache FalconJX 0.8.0
• Component/s: Falcon
• Assignee: Unassigned
• Reporter: Josh Tynjala
• Created: 07/Jun/17 15:00
• Updated: 07/Jun/17 16:01

Description

Using the following code:

src/NullExceptionFX.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">
	<fx:Declarations>
		<fx:Fake test="test"/>
	</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>
</js:Application>

Compile with js/bin/mxmlc:

mxmlc src/NullExceptionFX.mxml

The following error will be included in the output:

Unexpected exception 'java.lang.NullPointerException'.

There is no stack trace with this exception.

If you change the namespace from fx to js, you get a proper compiler error instead of an exception.

<js:Fake test="test"/>

NullExceptionFX.mxml(5): col: 3 This tag is unexpected. It will be ignored.

                <js:Fake test="test"/>

With that in mind, I guess it must be treating the fx namespace as special and it's taking a different path.

If you leave out the property, you also get a NullPointerException:

<fx:Fake/>

And this one includes a stack trace:

java.lang.NullPointerException org.apache.flex.compiler.internal.codegen.mxml.flexjs.MXMLFlexJSEmitter.emitInstance(MXMLFlexJSEmitter.java:1751)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.visitInstance(MXMLBlockWalker.java:246)org.apache.flex.compiler.internal.visitor.mxml.MXMLNodeSwitch.handle(MXMLNodeSwitch.java:96)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.walk(MXMLBlockWalker.java:149)org.apache.flex.compiler.internal.codegen.mxml.MXMLEmitter.emitDeclarations(MXMLEmitter.java:105)org.apache.flex.compiler.internal.codegen.mxml.flexjs.MXMLFlexJSEmitter.emitDeclarations(MXMLFlexJSEmitter.java:507)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.visitDeclarations(MXMLBlockWalker.java:198)org.apache.flex.compiler.internal.visitor.mxml.MXMLNodeSwitch.handle(MXMLNodeSwitch.java:78)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.walk(MXMLBlockWalker.java:149)org.apache.flex.compiler.internal.codegen.mxml.flexjs.MXMLFlexJSEmitter.emitDocument(MXMLFlexJSEmitter.java:546)org.apache.flex.compiler.internal.codegen.mxml.flexjs.MXMLFlexJSBlockWalker.visitDocument(MXMLFlexJSBlockWalker.java:69)org.apache.flex.compiler.internal.visitor.mxml.MXMLNodeSwitch.handle(MXMLNodeSwitch.java:84)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.walk(MXMLBlockWalker.java:149)org.apache.flex.compiler.internal.codegen.mxml.flexjs.MXMLFlexJSBlockWalker.visitFile(MXMLFlexJSBlockWalker.java:61)org.apache.flex.compiler.internal.visitor.mxml.MXMLNodeSwitch.handle(MXMLNodeSwitch.java:90)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.walk(MXMLBlockWalker.java:149)org.apache.flex.compiler.internal.codegen.mxml.MXMLBlockWalker.visitCompilationUnit(MXMLBlockWalker.java:168)org.apache.flex.compiler.internal.codegen.mxml.MXMLWriter.writeTo(MXMLWriter.java:72)org.apache.flex.compiler.clients.MXMLJSCFlex.compile(MXMLJSCFlex.java:377)org.apache.flex.compiler.clients.MXMLJSCFlex._mainNoExit(MXMLJSCFlex.java:245)org.apache.flex.compiler.clients.MXMLJSCFlex.mainNoExit(MXMLJSCFlex.java:202)org.apache.flex.compiler.clients.MXMLJSC._mainNoExit(MXMLJSC.java:352)org.apache.flex.compiler.clients.MXMLJSC.mainNoExit(MXMLJSC.java:287)org.apache.flex.compiler.clients.MXMLJSC.staticMainNoExit(MXMLJSC.java:247)org.apache.flex.compiler.clients.MXMLJSC.main(MXMLJSC.java:229)

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