Suddenly system went down and I restarted. Everything looks fine at SAP MMC, all services started and nothing wrong at work directory. I am not able to login with any user ID. I am not able to start Visual Admin also. I tried to change visual admin password, still not working. It is Java portal connected to BW abap. I am getting this error while accessing portal http://<hostname>:50000/irj/portal
500 Internal Server Error
Application error occurred during request processing.
Details: java.lang.NullPointerException: null
I am able to accessthis link http://<hostname>:50000/index.html. But not able to login with any user ID. I activated sap* and logged in and verified other IDs are not lcoked and deactivated sap* parameter and tried to login again using j2ee_admin, it is not working. Nothing happens at the lgoin screen. Please help at the earliest.