Thread Safe

[Gowher Naik]

Following are thread Safe
request attributes
response Object
local variables

Following are not thread Safe
servletcontext attributes
session attributes
instance variables

What about ServletConfig parameters?
Are they access by multiple threads at a single time?
i know ServletConfig parameters are Read Only constants.

Thanks

[Ali Gohar]

ServletConfig Parameters are readonly then i think it doesn't matter

[Elan Ram]

Hey, we can set only the attributes. Not parameters. There are no setter methods to set the same.
Hence, Thread safety is applied only to attributes and not a paramters.

[Manikandan Jayaraman]

More to note ...

As said, Parameters are thread-safe as there are no setters for the same.

Only in SingleThreadModel, instance variables are thread-safe.

Static Variables, Context Attributes and Session Attributes are never thread safe.