Subj : Re: memory error causing undefined value has no properties
To   : wyx <tryung@polyu.edu.hk>
From : Igor Bukanov <igor@icesoft.no>
Date : Fri Jan 24 2003 01:39 pm

To determine if it is a Rhino or JVM bug , could you try to run you 
scripts with Rhino 1.5R2, 1.5R3 and a release candidate for 1.5R4?

Regards, Igor

wyx wrote:
> hello all,
> I use rhino and written a js to calculate some statistic.
> In my js file, I used array of javascript object
> and also a few array of string and integer.
> 
> So I have a lof of "for/loop" as I need to iterate the values.
> 
> originally, I use "for(var in..)" for each array.
> On SunBlade 100 with jdk 1.3.1_04-b02, the js program works fine 
> and no error.
> 
> however, after I deployed my js to E280 with jdk 1.3.1-b24, it will
> some time show the "undefined value has no properties" error.
> But this error seems showing randomly, becuase I apply the same set of data,
> sometime it will show the error, sometime it will not.
> 
> And lastly, I added some system.out.println in the js file.
> and I found that in the "for(var in...)" loop, sometime it will skip
> some index and then error thrown.
> eg. 
> idx=151, print something
> idx=153, print something
> 
> then error thrown. idx=152 was skipped.
> 
> Then after a pain investigation, I replace all the
> "for(var in...)" loop by "for(var x=0; x<total; x++)"
> then the "undefined value..." error never show up.
> 
> I use interpret mode (optimization=-1).
> 
> But so bad is that, there is some memory reference error.
> I don't know why sometime, some interger value will be refered
> with some garbage. eg. 4.:
> So I added the follow line to check it.
> 
> if( parseInt(itemTCount[tt].tCount) !=  itemTCount[tt].tCount)
> 	java.lang.System.out.println("Error item:["+itemTCount[tt].tCount +"]");
> 
> What I expect is some string print out.
> But so strange that it print something like
> Error item:[130]
> 
> so....if the value is 130, then how can it be printed out?
> 
> so..I think there maybe some memory reference error for rhino when
> it need to do complicated calculation or has many objects in the scope.
> 
> hope some can help!
> 
> yung

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