How do you differentiate between a server hang and server crash issue?

Answer :
When a Server crashes, the JAVA process no longer exists.
When the Server is hung, it stops responding.
We can use the WebLogic.ADMIN utility to ping the server.
In case of a hang situation we can take multiple thread dumps and analyze the cause of hang.

Various reasons for a server crash:
 a) Native IO
b) SSL Native Libraries
c) JVM
d) Supported Configuration
e) JDBC Driver issue