[cfaussie] Re: Call Java Class (Java Code Attached)

Mon, 20 Mar 2006 19:06:29 -0800

That's because the class doesn't have a no-arguments constructor. You need to provide an int argument "level".

Blair

On 3/21/06, Dale Fraser <[EMAIL PROTECTED]> wrote:

This

<cfobject action="" type="java" class="IceKey" name="myObj" />
<cfset ret=myObj.init() />
<cfdump var="#myObj#" />

Gives this

Error Occurred While Processing Request
Unable to find a constructor for class IceKey that accepts parameters of
type ( ).


The error occurred in D:\Tools\Web\test.cfm: line 2

1 : <cfobject action="" type="java" class="IceKey" name="myObj" />
2 : <cfset ret=myObj.init() />
3 : <cfdump var="#me#" />




Regards
Dale Fraser


> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Mark Mandel
> Sent: Tuesday, 21 March 2006 13:42 PM
> To: [email protected]
> Subject: [cfaussie] Re: Call Java Class (Java Code Attached)
>
> To copy paste out of the coldfusion documentation:
>
> http://livedocs.macromedia.com/coldfusion/7/htmldocs/wwhelp/wwhimpl/common
> /html/wwhelp.htm?context=ColdFusion_Documentation&file=part_dev.htm
>
>
>
>       Invoking objects
>
>        The cfobject tag makes Java objects available in ColdFusion MX. It
> can access any Java class that is available on the JVM classpath or in
> either of the following locations:
>
>       *       In a Java archive (.jar) file in web_root/WEB-INF/lib
>       *       In a class (.class) file in web_root/WEB-INF/classes
>
>       For example:
>
>       <cfobject type="Java" class="MyClass" name="myObj">
>
>       Although the cfobject
> <http://livedocs.macromedia.com/coldfusion/7/htmldocs/00000302.htm#2820239
> >  tag loads the class, it does not create an instance object. Only static
> methods and fields are accessible immediately after the call to cfobject.
>
>       If you call a public non-static method on the object without first
> calling the init method, there ColdFusion makes an implicit call to the
> default constructor.
>
>       To call an object constructor explicitly, use the special ColdFusion
> init method with the appropriate arguments after you use the cfobject tag;
> for example:
>
>       <cfobject type="Java" class="MyClass" name="myObj">
>       <cfset ret=myObj.init(arg1, arg2)>
>
>       Note: The init method is not a method of the object, but a
> ColdFusion identifier that calls the new function on the class
constructor.
> So, if a Java object has an init method, a name conflict exists and you
> cannot call the object's init method.
>
>       To have persistent access to an object, you must use the init
> function, because it returns a reference to an instance of the object, and
> cfobject does not.
>
>       An object created using cfobject or returned by other objects is
> implicitly released at the end of the ColdFusion page execution.
>
>
> Btw - you may want to brush up on your OO vocabulary.  I think you meant
> to say you could 'not find a init method in this class' or something to
> that effect.
>
> Mark
>
>
>
> On 3/21/06, Dale Fraser <[EMAIL PROTECTED]> wrote:
>
>
>       Hey,
>
>       I'm no Java guru, but I don't see a constructor class or init method
> in this
>       function.
>
>       Regards
>       Dale Fraser
>
>
>       > -----Original Message-----
>       > From: [email protected] <mailto:[email protected]>
> [mailto:[email protected]] On
>       > Behalf Of Mark Mandel
>       > Sent: Tuesday, 21 March 2006 13:02 PM
>       > To: [email protected] <mailto:[email protected] >
>       > Subject: [cfaussie] Re: Call Java Class (Java Code Attached)
>       >
>       > Actually - what just popped into my head -
>       >
>       > Try this -
>       >
>       > <cfscript>
>       >   myObj = createObject("java", "IceKey").init();
>       > </cfscript>
>       >
>       > I have found on occasion you actually need to explicitly call the
> default
>       > constructor on the Java object, otherwise you get weirdness.
>       >
>       > I'm not really sure why it is, I have a feeling it may have
> something to
>       > do with static attributes - therefore I tend to call init() on all
>       > constructors by default.
>       >
>       > Try that, and see if that works.
>       >
>       > Mark
>       >
>       >
>
>
>
>
>
> --
> E: [EMAIL PROTECTED]
> W: www.compoundtheory.com
> ICQ: 3094740
>




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