File Template integer parameter/variable

Variables passed in via the Template dialog are passed in as Strings. As a result, the $a + 1 is resulting in string concatenation and not addition. So you need to convert the String to an Integer.

The Template uses Apache Velocity Template Engine which in turn can use Java methods.  Ultimately, we want to use the Integer.paerseInt(String) method. From my understanding of Velocity, there is not a way in the template to call a static method without also adding some code to the Java side of things before parsing the template. Since we do not have access to the parser, we can use an alternate way of accessing the static method... we'll take advantage of the simple fact that instances of a class have access to that classes static method. We create a "dummy" 'Integer' variable to use to access the Integer classes static methods:

#set($Integer = 0)
#set($inc = $Integer.parseInt($a) + 1)

That should give you what you are after.

Thanks, great work around.