building a Chart with an Array

[law]

Hi all,
I have an array that gets populated in a Scriptlet. I assign the scriptlet's output to a variable in my iReport.
I had tested the variable/Scriptlet output with both types Long[] and List. I'm getting very similar results:
the array gets populated, I can see it grow in "Detail" band, then I can view the content of it in the "Summary" band.

The problem comes when I attempt to set it as a "Category Expresion" in one of iReport charts.
When the array in a Long[], the error is:
Error filling print... [Ljava.lang.Long; cannot be cast to java.lang.Comparable

When the array in a String[], the error is:

Error filling print... [Ljava.lang.String; cannot be cast to java.lang.Comparable

When the array is a List, the error is:  
Error filling print... java.util.ArrayList cannot be cast to java.lang.Comparable

Class Long & String do implement Comparable. Am I missing a cast? not sure how to pipe the content of an array into an iReport chart. Any clues anyone?

Post Edited by liw at 08/20/2012 21:53

[law]

Here is something I'm trying right now. I think it is possible that the first time the chart attempt to access my array it is undefined and hence I get the error. I'm thinking the syntax below would give the right value as the chart gets created. In "Category Expession" I'm trying now:

$V{likesDiff}.length >0 ? $V{likesDiff}[likesDiff.length]:0

So far the error is

Error filling print... Error evaluating expression :      Source text : $V{likesDiff}.length >0 ? $V{likesDiff}[likesDiff.length]:0

I'm still hoping to make a chart out of an array.

 

 

 

[law]

So far, I found no way of making a chart out of an array. My guess is that's not something possible - didn't find a single reference on line for it.

[tech_sb]

Hi liw,

Would you be so kind to post the code for the first part of your question? That is, the scriplet to populate the array and how to display the array contents in the detail band and on the summary band as well?

I am new to iRepor and it will be great to get your help.