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A
Anonymous
November 1, 2008
Question

Bizarre Error - Attribute Validation Error

  • November 1, 2008
  • 2 replies
  • 659 views
Hi there,

After searching on how to reverse an array, I eventually stumbled upon a nice little piece of Java which would apparently do the trick. However, when I call this function it doesn't return anything. When I put the variable within a CFDUMP tag, I suddenly get an error:

" Attribute validation error.
The tag requires the attribute var. "

But, the attribute IS there. See my example code below.

<cfscript>
function arrayRev(myArray) {
return createObject("java", "java.util.Collections").reverse(myArray);
}
</cfscript>

<!--- This line DOES return my array, so now I know it is present --->
<cfdump var="#application.objRecursion.getBreadcrumbArray(url.item_id)#" />

<!--- This line gives me the error about the attribute VAR not being present. Clearly it is --->
<cfdump var="#arrayRev(application.objRecursion.getBreadcrumbArray(url.item_id))#" />

Now, clearly this is something to do with the function.

So, I have two questions:

1. Why is this function not working?
2. What is wrong with this function that is causing the error?

Many thanks,
Mikey.
    This topic has been closed for replies.

    2 replies

    D
    Dan_Bracuk
    Inspiring
    November 1, 2008
    quote:
    Originally posted by: Kapitaine
    Hi there,

    After searching on how to reverse an array, I eventually stumbled upon a nice little piece of Java which would apparently do the trick. However, when I call this function it doesn't return anything. When I put the variable within a CFDUMP tag, I suddenly get an error:

    " Attribute validation error.
    The tag requires the attribute var. "

    But, the attribute IS there. See my example code below.

    <cfscript>
    function arrayRev(myArray) {
    return createObject("java", "java.util.Collections").reverse(myArray);
    }
    </cfscript>

    <!--- This line DOES return my array, so now I know it is present --->
    <cfdump var="#application.objRecursion.getBreadcrumbArray(url.item_id)#" />

    <!--- This line gives me the error about the attribute VAR not being present. Clearly it is --->
    <cfdump var="#arrayRev(application.objRecursion.getBreadcrumbArray(url.item_id))#" />

    Now, clearly this is something to do with the function.

    So, I have two questions:

    1. Why is this function not working?
    2. What is wrong with this function that is causing the error?

    Many thanks,
    Mikey.


    -
    -__cfSearching__-
    Inspiring
    November 1, 2008
    If you are going to use java, get to know the API's. It will save you a lot of future headaches.

    > This line gives me the error about the attribute VAR not being present. Clearly it is
    > return createObject("java", "java.util.Collections").reverse(myArray);

    No it is not. Look at the API. java.util.Collections.reverse(..) returns void (ie nothing). So your function returns nothing.
    http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collections.html#reverse(java.util.List)
    A
    Anonymous
    November 1, 2008
    quote:
    Originally posted by: -==cfSearching==-
    If you are going to use java, get to know the API's. It will save you a lot of future headaches.

    > This line gives me the error about the attribute VAR not being present. Clearly it is
    > return createObject("java", "java.util.Collections").reverse(myArray);

    No it is not. Look at the API. java.util.Collections.reverse(..) returns void (ie nothing). So your function returns nothing.
    http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collections.html#reverse(java.util.List)


    Yes, I really should start looking at the docs, but I just happened to come accross this, I didn't make a point of using it because I know much about Java, I'm still very much learning CF! ha!!

    Hmm, well, on a side note then, all I really want to do is reverse an array. Does anyone have an idea of how to do this. The only solution other than this that I have seen is to convert this to a list, use a CF reverse and then convert is back to an array. However, this solution is a bit dirty and doesn't always return the correct results e.g. reversing the characters in a whole word etc.

    Thanks for your help and advice.

    Any further help or advice would be greatly appreciated.

    Many thanks!
    Mikey.
    -
    -__cfSearching__-
    Inspiring
    November 1, 2008
    > createObject("java", "java.util.Collections").reverse(myArray);
    > Hmm, well, on a side note then, all I really want to do is reverse an array

    It does work. Just not the way you are thinking ;-) It operates in place. In other words, it modifies the array you pass in, rather than creating and returning a new one. Similar to the CF arrayAppend(..) function.

    To see the results just dump the #myArray# object.





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