Struts2 setting param in struts.xml JFreeChart

[dynamicd]

In my struts.xml file i need to pass a param dynamically for the height of
JFreeChart
I have
param name="height" ${height} /param

which is set in my controller as an Integer.
 public void setHeight(Interger height)
 public Integer  getheight which returns an Integer
However the param gets set as a String.

It works if i put
param name="height" 400 /param

Any help is appreciated. 
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