WSO2 Data Services Server REST configuration - rest

Question

First post to SO, hopefully, I get it right. :-)
And, new to WSO2DSS...
I'd like to configure WSO2DSS to expose REST services like, for example:
http://localhost/svcendpoint/products
http://localhost/svcendpoint/products/computer
http://localhost/svcendpoint/products/computer/disks
where each url returns a more refined list. I've set up three queries / operations / resources, but I'm not getting the expected results.
I am getting the list for the first, a Axis2 "String index out of range" exception for the second, and a list for the third.
I'm not sure if it is me, a bug, or the wrong way to do this. Any help would be appreciated.
Here is the .dbs file (I can include the exception stacktrace if it will be useful):
<data name="MyDataService">
<config id="MyDataSource">
<property name="driverClassName">oracle.jdbc.driver.OracleDriver</property>
<property name="url">jdbc:oracle:thin:xxxxxx</property>
<property name="username">xxx</property>
<property name="password">xxx</property>
</config>
<query id="MyCategoriesQuery" useConfig="MyDataSource">
<sql>select distinct CAT_NM from T_FAM_BLMBRG_DATA_DICT order by CAT_NM</sql>
<result defaultNamespace="http://test.org" element="categories" rowName="">
<element column="FLD_MNM_NM" name="FLD_MNM_NM" xsdType="string"/>
<element column="FLD_ID" name="FLD_ID" xsdType="string"/>
<element column="DATA_LIC_CAT_NM" name="DATA_LIC_CAT_NM" xsdType="string"/>
<element column="FLD_DESC_TX" name="FLD_DESC_TX" xsdType="string"/>
<element column="CAT_NM" name="CAT_NM" xsdType="string"/>
<element column="FLD_DFN_TX" name="FLD_DFN_TX" xsdType="string"/>
<element column="FLD_DATYP_NM" name="FLD_DATYP_NM" xsdType="string"/>
<element column="CRT_USER_ID" name="CRT_USER_ID" xsdType="string"/>
<element column="CRT_TS" name="CRT_TS" xsdType="string"/>
<element column="UPD_USER_ID" name="UPD_USER_ID" xsdType="string"/>
<element column="UPD_TS" name="UPD_TS" xsdType="string"/>
</result>
</query>
<query id="MyCategoryQuery" useConfig="MyDataSource">
<sql>select * from T_FAM_BLMBRG_DATA_DICT where CAT_NM = :cat</sql>
<result defaultNamespace="http://test.org" element="entries" rowName="">
<element column="FLD_MNM_NM" name="FLD_MNM_NM" xsdType="string"/>
<element column="FLD_ID" name="FLD_ID" xsdType="string"/>
<element column="DATA_LIC_CAT_NM" name="DATA_LIC_CAT_NM" xsdType="string"/>
<element column="FLD_DESC_TX" name="FLD_DESC_TX" xsdType="string"/>
<element column="CAT_NM" name="CAT_NM" xsdType="string"/>
<element column="FLD_DFN_TX" name="FLD_DFN_TX" xsdType="string"/>
<element column="FLD_DATYP_NM" name="FLD_DATYP_NM" xsdType="string"/>
<element column="CRT_USER_ID" name="CRT_USER_ID" xsdType="string"/>
<element column="CRT_TS" name="CRT_TS" xsdType="string"/>
<element column="UPD_USER_ID" name="UPD_USER_ID" xsdType="string"/>
<element column="UPD_TS" name="UPD_TS" xsdType="string"/>
</result>
<param name="cat" sqlType="STRING"/>
</query>
<query id="MyCategoryFldQuery" useConfig="MyDataSource">
<sql>select * from T_FAM_BLMBRG_DATA_DICT where CAT_NM = :cat and FLD_ID = :fld</sql>
<result defaultNamespace="http://test.org" element="names" rowName="">
<element column="FLD_MNM_NM" name="FLD_MNM_NM" xsdType="string"/>
<element column="FLD_ID" name="FLD_ID" xsdType="string"/>
<element column="DATA_LIC_CAT_NM" name="DATA_LIC_CAT_NM" xsdType="string"/>
<element column="FLD_DESC_TX" name="FLD_DESC_TX" xsdType="string"/>
<element column="CAT_NM" name="CAT_NM" xsdType="string"/>
<element column="FLD_DFN_TX" name="FLD_DFN_TX" xsdType="string"/>
<element column="FLD_DATYP_NM" name="FLD_DATYP_NM" xsdType="string"/>
<element column="CRT_USER_ID" name="CRT_USER_ID" xsdType="string"/>
<element column="CRT_TS" name="CRT_TS" xsdType="string"/>
<element column="UPD_USER_ID" name="UPD_USER_ID" xsdType="string"/>
<element column="UPD_TS" name="UPD_TS" xsdType="string"/>
</result>
<param name="cat" sqlType="STRING"/>
<param name="fld" sqlType="STRING"/>
</query>
<operation name="MyCategoriesService">
<call-query href="MyCategoriesQuery"/>
</operation>
<operation name="MyCategoryService">
<call-query href="MyCategoryQuery">
<with-param name="cat" query-param="cat"/>
</call-query>
</operation>
<operation name="MyCategoryFldService">
<call-query href="MyCategoryFldQuery">
<with-param name="cat" query-param="cat"/>
<with-param name="fld" query-param="fld"/>
</call-query>
</operation>
<resource method="GET" path="category">
<call-query href="MyCategoriesQuery"/>
</resource>
<resource method="GET" path="category/{cat}">
<call-query href="MyCategoryQuery">
<with-param name="cat" query-param="cat"/>
</call-query>
</resource>
<resource method="GET" path="category/{cat}/{fld}">
<call-query href="MyCategoryFldQuery">
<with-param name="cat" query-param="cat"/>
<with-param name="fld" query-param="fld"/>
</call-query>
</resource>
</data>

Answer 1

You need to invoke the service as shown below
http://localhost:9763/services/SERVIVENAME.HTTPEndpoint/RESOURCEPATH/
For example
http://localhost:9763/services/MyDataSource.HTTPEndpoint/category/computer
Please refer [1] for more details
https://docs.wso2.org/display/DSS310/Exposing+Data+as+REST-Style+Resources