Error during connecting to the odata service of Employee

Question

Hi Everyone,
When I am calling the employee odata service the following message is coming,
and below error messages are coming in the console,
2014-04-01 17:19:53 Device API logging initialized - DEVICE 2014-04-01 17:19:53 registerResourcePath ('', 'resources/') -  sap.ui.ModuleSystem 2014-04-01 17:19:53 URL prefixes set to: -  sap.ui.ModuleSystem 2014-04-01 17:19:53  (default) : resources/ -  sap.ui.ModuleSystem 2014-04-01 17:19:54 registerResourcePath ('employee_test', './employee_test/') -  sap.ui.ModuleSystem 2014-04-01 17:19:56 The following problem occurred: HTTP request failed400,Bad Request,
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF1039D3100155D116802 -  2014-04-01 17:19:56 message: HTTP request failed Response Text:
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF1039D3100155D116802 Status Code: 400 Status Text: Bad Request -  2014-04-01 17:19:56 The following problem occurred: HTTP request failed400,Bad Request,
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF10E9D3100155D116802 -  2014-04-01 17:19:56 message: HTTP request failed Response Text:
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF10E9D3100155D116802 Status Code: 400 Status Text: Bad Request -  2014-04-01 17:19:57 The following problem occurred: HTTP request failed400,Bad Request,
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF1199D3100155D116802 -  2014-04-01 17:19:57 message: HTTP request failed Response Text:
SY/530Atleast one filter parameter is mandatoryBA93B9E3C3CCF1199D3100155D116802 Status Code: 400 Status Text: Bad Request -
And also when I am calling the entity set 'EmployeeCollection' of the odata service it is giving the below error,
Kindly tell me, which will help me to cal the data of the EmployeeCollection entity set of the odata service. How I can connect to that odata with the help of the NetWeaver Gateway? And why this errors are coming? Do I need any authorization from our HR team of our company to connect to this odata service to retrieve data or the data should come automatically?
Regards,
Soumya

Answer 1

To understand the error,
1.go to developer console in chrome by pressing F12.
2. Next go to network tab and refresh the application by pressing F5.
3.In the network tab you will see an OData service call being fired to fetch  Employee collection data. 4.Right click on the call and open it in a new tab. There you can see the actual error message.
From the error you have posted it looks like, the Entity collection expects atleast one filter condition to be passed while calling the collection. Calling the Entity collection without any filter is equivalent to 'SELECT *' without any WHERE clause. However in this case the particular service enforces a where clause by specifying a $filter option. If no $filter is supplier it raises an exception which you get here.