ORDS Template with parameter does not work

Question

Hello everybody,
I can not get working a RESTful Service using the ORDS_SERVICES -API (ORDS version 3.0.0.343.07.58), same Query without parameter (hardcoded product_id) works fine.
declare
l_module_id number;
l_template_id number;
l_handler_id  number;
l_parameter_id number;
begin
ORDS_SERVICES.delete_module(p_name => 'test_parameter');
l_module_id := ORDS_SERVICES.create_module(p_name => 'test_parameter',
                            p_uri_prefix => '/test_parameter',
                            p_items_per_page => 10,
                            p_status => 'PUBLISHED',
                            p_comments => null);
l_template_id := ORDS_SERVICES.add_template(p_module_id => l_module_id,
                           p_uri_template => '/demo_product_info_10/',
                           p_priority => 0,
                           p_etag_type => 'HASH',
                           p_etag_query => null,
                           p_comments => null);
l_handler_id := ORDS_SERVICES.add_handler(p_template_id => l_template_id,
                           p_source_type => 'MEDIA', -- source_type IN ('COLLECTION_FEED', 'COLLECTION_ITEM', 'FEED', 'MEDIA', 'PLSQL', 'QUERY', 'QUERY_1_ROW')
         p_source => 'select mimetype, product_image from demo_product_info where product_id = 2',
         p_format => 'DEFAULT',
         p_method => 'GET',
         p_items_per_page => null,
         p_mimes_allowed => null,
         p_comments => null);
/* now same result but with parameter */
l_template_id := ORDS_SERVICES.add_template(p_module_id => l_module_id,
                           p_uri_template => '/demo_product_info/{product_id}',
                           p_priority => 0,
                           p_etag_type => 'HASH',
                           p_etag_query => null,
                           p_comments => null);
l_handler_id := ORDS_SERVICES.add_handler(p_template_id => l_template_id,
                           p_source_type => 'MEDIA', -- source_type IN ('COLLECTION_FEED', 'COLLECTION_ITEM', 'FEED', 'MEDIA', 'PLSQL', 'QUERY', 'QUERY_1_ROW')
         p_source => 'select mimetype, product_image from demo_product_info where product_id = :product_id',
         p_format => 'DEFAULT',
         p_method => 'GET',
         p_items_per_page => null,
         p_mimes_allowed => null,
         p_comments => null);
l_parameter_id := ORDS_SERVICES.add_parameter(p_handler_id => l_handler_id,
                           p_name =>  'product_id',
         p_bind_variable_name => 'product_id',
         p_source_type => 'URI',
         p_param_type => 'INT',
         p_access_method => 'IN',
         p_comments => null);
commit;
end;
The first template works fine:
http://localhost:8080/ords/xxx/test_parameter/demo_product_info_10/
shows a jpeg image of a wallet.
The second template does not work:
http://localhost:8080/ords/xxx/test_parameter/demo_product_info/10/
fails with error:
mapped request using: BasePathMapper [basePath=/xxx/] to: SCHEMA:apex|XXX
Choosing: oracle.dbtools.http.dispatch.DispatchMetaData as current candidate with score: MetaDataScore [score=0, matchedMethod=  GET: {10299, false}
  common: CommonMetaData [accepts=[], cors=null, documentation=null, frameOptions=null, pageSize=10, pagination=NONE, requiresPrivilege=null, transport=null]
, matchedPattern= /test_parameter/demo_product_info/{product_id}
common: CommonMetaData [accepts=[], cors=null, documentation=null, frameOptions=null, pageSize=null, pagination=null, requiresPrivilege=null, transport=null]
methods:
  GET: {10299, false}
  common: CommonMetaData [accepts=[], cors=null, documentation=null, frameOptions=null, pageSize=10, pagination=NONE, requiresPrivilege=null, transport=null]
stack trace:
oracle.dbtools.http.errors.InternalServerException: java.lang.IllegalArgumentException: INT
at oracle.dbtools.http.errors.ErrorPageFilter.internalError(ErrorPageFilter.java:165)
at oracle.dbtools.http.errors.ErrorPageFilter.doFilter(ErrorPageFilter.java:113)
at oracle.dbtools.http.filters.HttpFilter.doFilter(HttpFilter.java:44)
at oracle.dbtools.http.filters.FilterChainImpl.doFilter(FilterChainImpl.java:51)
at oracle.dbtools.http.cors.CORSFilter.doFilter(CORSFilter.java:35)
at oracle.dbtools.http.filters.HttpFilter.doFilter(HttpFilter.java:44)
I changed the add_parameter-call p_param_type => 'INT' to be  p_param_type => 'STRING'
then error remains the same and strack trace says
oracle.dbtools.http.errors.InternalServerException: java.lang.IllegalArgumentException: STRING
at oracle.dbtools.http.errors.ErrorPageFilter.internalError(ErrorPageFilter.java:165)
at oracle.dbtools.http.errors.ErrorPageFilter.doFilter(ErrorPageFilter.java:113)
Could you please confirm and fix,
kind regards,
Tom

Answer 1

This is a guess, but I suspect that ords_services.add_parameter() is not required at all.
Also, your URL /demo_product_info/10/ should not have the trailing slash (according to your template URI).
For more information, I suggest you look here:
ords.3.0.0.343.07.58.zip\ords.war\scripts\migrate\core\ords_migrate.plb
The migration package will show what is usually done for templates that already exist within APEX 4.2. I checked my templates and the ones with URI variables {in-curly-brackets} contain no records in apex_040200.wwv_flow_rt$parameters.
-Kris