Calling static methods

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marekss - 29 May 2007 20:09 GMT

Hi,
I have a problem with calling static methods after creating a object:
I am using coldfusion 7.0 and this is my code:
When I am using either <cfobject> or createObject the same

<cfobject action="create" type="java"
class="com.endeca.navigation.ENEQueryToolkit" name="new_N">
<cfset new_N = createObject("java",
"com.endeca.navigation.ENEQueryToolkit")>
<cfdump var = "#new_N#">
<cfset new_N = new_N.selectRefinement(#my_nav_results#,
toString(sample_refinement_value))>

1. CFDUMP tells me that object [unknown type] and [unable to convert to string]
2. When I call a static method new_N.selectRefinement(...) i get "The selected
method selectRefinement was not found."
3. Arguments to selectRefinement() method are of correct datatype

Below are all methods of this class (all are static):
static boolean isImplicitRefinement(Dimension dim, DimVal refinement)
static DimValIdList removeDescriptor(Navigation n, DimVal descriptor)
static DimValIdList selectAncestor(Navigation n, DimVal ancestor, DimVal
descriptor)
static DimValIdList selectRefinement(Navigation n, DimVal refinement)

Any suggestions?
Thank You

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insuractive - 29 May 2007 20:29 GMT

First, you don't have to use both createObject() and <cfobject> - one or the
other will suffice (personally, I prefer CreateObject()).

Second, are you sure you have set up the java files correctly in your CF
administrator / classpath? If you have the following code should show you
SOMETHING:

<cfset new_N = createObject("java", "com.endeca.navigation.ENEQueryToolkit")>
<cfdump var="#new_N#">

Until you can get the above code working, your object is not loaded correctly
in CF.

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marekss - 29 May 2007 20:57 GMT

I have been using createOject() and my .jar files are in C:\CFusionMX7\lib . I
assume that is correct because I successfully created objects and called
non-static methods on them. Schould <cfdump> print all methods that are
assosiated with this class even though all methods are static? My cfdump output
is clickable box with object [unknown type].

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cf_dev2 - 29 May 2007 20:53 GMT

I agree with insuractive. You need to resolve the createObject() problem first.

>static DimValIdList selectRefinement(Navigation n, DimVal refinement)

Then make sure you're passing in the correct object types. Is #my_nav_results#
an instance of "Navigation" and #sample_refinement_value# an instance of
"DimVal"? In any case I don't think you need the toString(..) call.

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cf_dev2 - 29 May 2007 22:12 GMT

Yes, placing the jar in C:\CFusionMX7\lib an rebooting is fine.

If the object is valid, Cfdump should print all of its public methods. I
don't know if it prints protected or private methods. I thought the cfdump box
was expanded by default.. but if you click the box does it show the method
names?

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marekss - 30 May 2007 01:33 GMT

There are only static methods in this class. My first post lists ALL methods
this class contains, there aren't any public or private methods.
I am passing correct object types, first argument is of type Navigation and
second of DimVal

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marekss - 30 May 2007 01:42 GMT

When I click on the <cfdump> box instead of methods i see [unable to convert to
string] on top section of cfdump box I see object [unknown type]. I have read
on lifedocs that in order to call static methods i just have to instantiate
object and then call static methods. For other methods (public, or private) I
have to use init() to initialize the object. I have tested with and without
initialization and it was unsuccessful.

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Adam Cameron - 30 May 2007 15:23 GMT

This might help:

http://www.bennadel.com/index.cfm?dax=blog:737.view

If not the article itself, then the links within in.

Signature

Adam

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marekss - 30 May 2007 16:18 GMT

After reading http://www.bennadel.com/index.cfm?dax=blog:737.view and all
related articles i found a solution to the problem: Below is a code that works.
First <cfdump> does not give any meaningful results but second <cfdump> after
calling static method returns correct value. The problem was with second
parameter instead #sample_refinement_value# i had
toSring(sample_refinement_value) which caused the error :
Thank you all for the input and suggestions.
<cfset new_N = createObject("java", "com.endeca.navigation.ENEQueryToolkit")>
<cfdump var = "#new_N#">
<cfset new_N = new_N.selectRefinement(#my_nav_results#,
#sample_refinement_value#)>
<cfdump var = "#new_N#">

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cf_dev2 - 30 May 2007 23:00 GMT

I knew you didn't need that toString(..) call ;-) Glad its working for you now.

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Calling static methods