While using hibernate code generation tools, Can i include custom code in the resulting pojos? if so, how do i configure reveng.xml so that it generates hbm.xml accordingly

for example

if i want to override hashcode() method, i would have the following section in hbm.xml
<meta attribute="class-code">
<![CDATA[
public void hashcode() {
----------------------------------------
}

]]>

How do i configure reveng.xml to create this section in hbm.xml

Either change the standard templates or create your own (maybe using the standard ones as a base). The docs provides guidence to applying the custom tempates.