[Swift-devel] Could not convert value to boolean: null

[Mihael Hategan]

Saw it too. I'm working on it.

On Tue, 2011-11-01 at 14:38 -0500, David Kelly wrote:
> I've noticed that with 0.93, I will occasionally see this error message "Could not convert value to boolean: null." The error is sporadic. It happens in maybe 1 out of every 50 attempts. When the error occurs, it happens immediately and exits. I've seen this with a few different scripts, but here is one from the test suite that just failed.
> 
> 0723-simplemapper-nopadding.swift
> ----
> type messagefile;
> 
> (messagefile t) write() { 
>     app {
>         echo @filename(t) stdout=@filename(t);
>     }
> }
> 
> messagefile outfile[] <simple_mapper;
>                      prefix="0723-simplemapper-nopadding.",
>                      suffix=".out",
>                      padding="0">;
> 
> outfile[0] = write();
> outfile[5] = write();
> outfile[75943] = write();
> ---
> 
> I added a dumpStack() to location that was printing the error to get a little more detail.
> ----
> Swift svn swift-r5262 cog-r3314 (cog modified locally)
> 
> RunID: 20111101-1414-r4ut0gjf
> Progress:  time: Tue, 01 Nov 2011 14:14:08 -0500
> java.lang.Exception: Stack trace
> 	at java.lang.Thread.dumpStack(Thread.java:1249)
> 	at org.globus.cog.karajan.util.TypeUtil.toBoolean(TypeUtil.java:127)
> 	at org.griphyn.vdl.karajan.lib.Mark.function(Mark.java:30)
> 	at org.griphyn.vdl.karajan.lib.VDLFunction.post(VDLFunction.java:62)
> 	at org.globus.cog.karajan.workflow.nodes.AbstractSequentialWithArguments.completed(AbstractSequentialWithArguments.java:194)
> 	at org.globus.cog.karajan.workflow.nodes.FlowNode.complete(FlowNode.java:214)
> 	at org.globus.cog.karajan.workflow.nodes.FlowContainer.post(FlowContainer.java:58)
> 	at org.globus.cog.karajan.workflow.nodes.functions.AbstractFunction.post(AbstractFunction.java:28)
> 	at org.globus.cog.karajan.workflow.nodes.Sequential.startNext(Sequential.java:29)
> 	at org.globus.cog.karajan.workflow.nodes.Sequential.executeChildren(Sequential.java:20)
> 	at org.globus.cog.karajan.workflow.nodes.FlowContainer.execute(FlowContainer.java:63)
> 	at org.globus.cog.karajan.workflow.nodes.FlowNode.restart(FlowNode.java:139)
> 	at org.globus.cog.karajan.workflow.nodes.FlowNode.start(FlowNode.java:197)
> 	at org.globus.cog.karajan.workflow.FlowElementWrapper.start(FlowElementWrapper.java:227)
> 	at org.globus.cog.karajan.workflow.events.EventBus.start(EventBus.java:104)
> 	at org.globus.cog.karajan.workflow.events.EventTargetPair.run(EventTargetPair.java:40)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:662)
> Execution failed:
> 	Could not convert value to boolean: null
> -----
> 
> It looks like the error is somehow related to Karajan getting null values from the stack. I have this as bug 585 (https://bugzilla.mcs.anl.gov/swift/show_bug.cgi?id=585)
> 
> David
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