External task and Multiple-join

Question

In a process, the order of activities is: Begin->interactive activity A -> multiple -> interactive activity B -> Join -> interactive activity C
This process has 2 instance variable, var1 and var2.
var1's type is BPMObject
var2's type is String.
PBL code in Mulitple is as follow.
---------------------------Multiple------------------------------
participants as Participant[]
ts as String[]
ts=var1.selectParticipants;
v as Int
v=length(ts)-1
for i2 in 0..v
do
     participants(i2)=Participant.find(name : ts(i2))
end
for each p in participants do
copy = clone(this)
copy.participant.next = p
copy.var1.voteResult="O"
end
The main task type of interactive activity B is set to external.
The PBL code in the interactive activity B is as follow
------------------------interactive activity Prepare--------------------------------------------------------
var1.voteResult=arg1
arg2=var1.voteResult
arg1 and arg2 in this interactive activity are fine.
Interactive activity B does not have a commit method .
The PBL code in the Join is below.
---------------------------------------------------Join-----------------------------------------------
var2=var2+"*"+copy.var1.voteResult
I also try: this.var2=this.var2+"*"+copy.var1.voteResult
However, it only outputs *
It only output *. The number of * equals the number of branch.
The main task of Interactive activity C is an external task.
This activity only has a very simple prepare method: arg1=var2
arg 1 is the argument. I just want to see the value of var2. However, the value of var2 is just *
I cannot get the value of each branch.
How to get the correct value of each branch?

Answer 1

I change the value type to Int. Then, it works.
How to get the value of String type?