I want to use hibernate3 filter. I define it like :
<filter-def name="typeFilter">
<filter-param name="myType" type="string"/>
type="boolean"/>
</filter-def>

Then on collection, I want to use this filter to filter the collection for bunch of types. e.g I want the condition as ":myType IN (value1, value2, value3). What would be the syntax of defining such a filter?

I believe you have it backwards. :myType will be the value(s) you pass in.

So your condition would be: "column_name in (:myType)"

And you call Filter.setParameterList("myType", values), where "values" is the Collection of values you want in the IN clause.