cfml

Can anyone help with how I would initialize an empty Java byte array in ColdFusion?

For instance:

`byte[] values = new byte[5];`

I realize I can do something like this
`values = javaCast("byte[]", [ 83, 65, 82, 65, 72 ]);`

But I need to initial byte array to be empty?

What about just setting an empty array to start? ``values = javaCast("byte[]", []);``

For my purposes, I need it to be initialized to a certain size.  Thanks.

Understood I had a feeling I was missing something.

```function createByteArray(string){
    var objString = createObject("Java", "java.lang.String").init(JavaCast("string", string));
    return objString.getBytes();
}```


Also Ben has a decent article about approaches too: <https://www.bennadel.com/blog/2544-creating-typed-java-arrays-in-coldfusion-using-javacast.htm>

How would I use the function you sent to make sure I got an array back of certain size?  For instance, if I needed "new byte[5]", would I need to send in a string argument of 5 characters?

And thanks, I've been reading Ben's article.  Admittedly, working with bytes/byte arrays is not my strong suit.

`values = CreateObject("java","java.lang.reflect.Array").`
            NewInstance(
                CreateObject("java","java.lang.Byte").TYPE,
                JavaCast( "int", 5 )
            );

:disappointed: If it ws 2021 you could just write the Java code directly in yer CFML file.

A Byte can't have a null _value_, as the backing byte doesn't support it. So this is as close as yer gonna get, I think:

```nullBytes = javaCast("Byte[]", [0,0,0,0,0])```
That results in the same thing <@U0KEJSUE8>'s one does, plus another angle I tried until I did my reading and worked out what yer asking seems invalid:

<https://trycf.com/gist/384565addd4995d708b2c052794353db/acf2021?theme=monokai>

(and, sorry, bad variable names in that. Should be `zeroBytes` not `nullBytes`.... didn't refactor after I changed my mind about what's going on.

re writing java directly in cfml, with lucee
<https://luceeserver.atlassian.net/browse/LDEV-4267>