[FLEX-22400] CLONE -Intermittent but easily reproducible internal compiler error in simple mxml project when you save before previous compile is done

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 4.0 (Release)
• Fix Version/s: Adobe Flex SDK 4.0 (Release)
• Component/s: Compiler API
• Environment: Affected OS(s): Windows; Affected OS(s): Windows; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 10/Dec/09 16:23
• Updated: 12/Jan/10 12:01
• Resolved: 16/Dec/09 06:45

Description

This is Windows only; I couldn't reproduce on Mac.

Steps to reproduce:
1. Make a new Flex project
2. Add an <fx:Script> block
3. In the <fx:Script> block, repeatedly and quickly do edit, save, edit, save, edit, save, over and over again. For example, the way I reproduced was by just inserting a semicolon and then pressing Ctrl-S to save, over and over. (If you wait too long between saves, the bug will not reproduce; you have to be fast. Don't wait for the previous compile to finish.)

Actual Results:
Pretty quickly, within a minute, an internal compiler error will occur. It isn't always the same callstack. Here are the three I got:

#1:

java.lang.NullPointerException
at flex2.linker.CULinkable.<init>(CULinkable.java:31)
at flex2.tools.PreLink.processMainUnit(PreLink.java:304)
at flex2.tools.PreLink.run(PreLink.java:91)
at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1556)
at flex2.tools.oem.Application.compile(Application.java:1169)
at flex2.tools.oem.Application.recompile(Application.java:1114)
at flex2.tools.oem.Application.compile(Application.java:805)
at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:344)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:276)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:127)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:190)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:74)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectBuilder.java:478)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuilder.java:296)
at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncrementalBuilder.java:133)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

#2: (This is almost identical #1, with the exception that #1 had a call to Application.recompile(), and this one did not)

java.lang.NullPointerException
at flex2.linker.CULinkable.<init>(CULinkable.java:31)
at flex2.tools.PreLink.processMainUnit(PreLink.java:304)
at flex2.tools.PreLink.run(PreLink.java:91)
at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1556)
at flex2.tools.oem.Application.compile(Application.java:1169)
at flex2.tools.oem.Application.compile(Application.java:902)
at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:344)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:276)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:127)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:190)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:74)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectBuilder.java:478)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuilder.java:296)
at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncrementalBuilder.java:133)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

#3:

java.lang.ClassCastException: flex2.compiler.util.MultiName cannot be cast to flex2.compiler.util.QName
at flex2.tools.PreLink.postRun(PreLink.java:182)
at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1562)
at flex2.tools.oem.Application.compile(Application.java:1169)
at flex2.tools.oem.Application.compile(Application.java:902)
at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:344)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:276)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:127)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:190)
at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:74)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectBuilder.java:478)
at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuilder.java:296)
at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncrementalBuilder.java:133)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Expected Results:
No internal compiler error

Workaround (if any):
Clean and rebuild.