<?xml version="1.0"?>
<!DOCTYPE service-builder PUBLIC
"-//Liferay//DTD Service Builder 6.1.0//EN"
"http://www.liferay.com/dtd/liferay-service-builder_6_1_0.dtd">
<service-builder package-path="com.test">
<author>Sanchita Dutta</author>
<namespace>FED</namespace>


<entity name="T_Category_Master" local-service="true" remote-service="false">
<!-- Group instance -->

<column name="groupId" type="long" />

<!-- Audit fields -->

<column name="companyId" type="long" />

<column name="Category_ID" type="int" primary="true" id-type="identity"/>
<column name="Category_Name" type="String" />


</entity>



<entity name="T_Product_Master" local-service="true" remote-service="false">

<column
name="Category_ID"
type="Collection"
entity="T_Category_Master"
mapping-key="Category_ID" />

<!-- Group instance -->

<column name="groupId" type="long" />

<!-- Audit fields-->

<column name="companyId" type="long" />

<column name="Category_ID" type="int" />
<column name="Product_ID" type="int" primary="true" id-type="identity"/>
<column name="Product_Name" type="String" />
<finder name="CategoryID" return-type="Collection">
<finder-column name="Category_ID" />
</finder>
</entity>



<entity name="T_Specification" local-service="true" remote-service="false">
<column
name="Product_ID"
type="Collection"
entity="T_Product_Master"
mapping-key="Product_ID" />
<!-- Group instance -->

<column name="groupId" type="long" />

<!-- Audit fields -->

<column name="companyId" type="long" />
<column name="Spec_ID" type="int" primary="true" id-type="identity"/>
<column name="Spaec_Name" type="String" />
<column name="Product_ID" type="int" />
<column name="Value" type="String" />
<finder name="ProductID" return-type="Collection">
<finder-column name="Product_ID" />
</finder>
</entity>


</service-builder>

Hi,

What's the error you're getting? Also I assume you're on 6.1?

Its very hard to tell what is the problem unless you show us what error you are getting.

But from the looks of service.xml it seems the error may very well be because of teh way you have defined the columns. Make sure the column names follow javabean specification. For example Category_ID should be categoryId

Your column definition below looks very dodgy too