EL in ZK 6 I had some issues trying to figure out some basic stuff since I didn't see it documented anywhere.

For concatenation I seemed to have to use el2's concat function...

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1. <listcell label="@load(owner.lastName.concat(', ').concat(owner.firstName))">  
2. </listcell>   

For equals you can't use == , need to use el's 'eq' or 'ne'

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1. visible="@load(productGroup.owner.id eq user.id)"   

visible="@load(productGroup.owner.id eq user.id)" 

Groovy - using a writer with FileIO

Groovy - using a writer with FileIO

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1. public void writeToFile(def directory, def fileName, def extension, def infoList) {  
2.   new File("$directory/$fileName$extension").withWriter { out ->  
3.     infoList.each {  
4.       out.println it  
5.     }  
6.   }  
7. }  

public void writeToFile(def directory, def fileName, def extension, def infoList) {
  new File("$directory/$fileName$extension").withWriter { out ->
    infoList.each {
      out.println it
    }
  }
}