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

[Mark Mandel]

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 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: 
cfaussie@googlegroups.com [mailto:cfaussie@googlegroups.com] On
> Behalf Of Mark Mandel
> Sent: Tuesday, 21 March 2006 13:02 PM
> To: 
cfaussie@googlegroups.com
> 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
>
>



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