How to get string list values in velocity template? foreach loop for 3 lists

[Sharath T S]

Hi All,

I have 3 String lists(lets say ListA, ListB and ListC) in my java class which maps to velocity template. I need to display the values of the list in a table.

As velocity allows only foreach loop i can get values of only one list. is there a way to get values from all three lists?

If not in foreach loop, how to access the list values through its index?

Any inputs will be much appreciated.

Thanks

[Sharath T S · Accepted solution]

Hi, 

with a little more investigation i found the answer.

from java class, lets say we have following code with populateVelocityParams method

params.put("listA",ListA);
//Map the below java utils List class 
params.put("list",List.class);

then in velocity template, 

just call 

$listA.get(index);
//"index" here is the list integer index position in ListA

Thanks,

Sharath TS

[Ture Hoefner]

Velocity does not iterate Lists, as far as I can tell.

Velocity documentation says that it iterates over Vector, Hashtable, or an array (not a List).

In my experience, that is true.  

https://velocity.apache.org/engine/1.7/user-guide.html#foreach-loop 

https://velocity.apache.org/engine/2.1/user-guide.html#foreach-loop 

I tried to make my velocity template iterate over a List and it did nothing.  I converted my List to an array and it worked fine.

I know that this thread is really old but other, newer, threads point to it (that's how I found it) and this thread made me think I could iterate over a List.  I could not.

I am developing a Confluence plugin, don't know if my pom.xml versions are out of date and some new Velocity engine or Atlassian ingredient changes things but beware:  in my case, Velocity does NOT iterate over a List.  It will, however iterate just fine over an array.

My template:

#foreach($result in $results)
  <tr><td>${result}</tr></td>
#end

My getter in Java:

public String[] getResults() {
    return results;
}

For my first try, using List<String> for my results the template rendered nothing for my List.  I went with an array and it works.  Decided not to mess with Vector for various reasons.