Solution : https://service.sap.com/sap/support/notes/986641 (SAP Service marketplace login required)
Key words :
calling bex web applications java works, alias sap_bw check object permissions depending, bex web application java, null system object, trc file shows, sap_j2ee_admin user group, end user reason, follwing error messages, webas abap system, respective backend system
Related Notes :
| 872043 | BEx Web Applications (Java): Access denied |