how to get rid of this Compile warning

Genericise your Map declaration, e.g.

Map<String, String> m = new LinkedHashMap<String, String>();

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best you can do is add an annotation to ignore the warning. personanlly not a fan of doing that.

Sorry - missed the code posted

>>>Map<String,String> aVar=(Map<String,String>)session.get("aVar");

This does not remove the warning.

> This does not remove the warning.

Didn't say it would :)  You can't get rid of that warning as the compiler has no way of know what type is being returned by get()

all you do is tell the compiler to ignore it (and not display it) using an annotation

http://stackoverflow.com/questions/1129795/what-is-suppresswarnings-unchecked-in-java

You can't remove the warning other than by compiler settings. Take comfort in the fact that if you compile the JDK source, you'll get many more warning. Generics is a shoehorned fit

>>@SuppressWarnings("unchecked")

when do you write  "unchecked"  warnings ?  Could you please list out few examples ?

I think , this keyword is more appropriate for Exceptions where "checked" is for predefined exceptions. e.g SQLException when you trying to connect to DB .

And "unchecked" is for Exceptions which can not be predicted at compile time . That is for run time. ..e.g RuntimeException.

Here  you are using in the context of warnings ...thats the reason  I'm worried.

when do you write  "unchecked"  warnings  ?

Thats what I mentioned above about telling the compiler to ignore those warnings
Not a good idea imo to be hiding warnings

unchecked is referring to the unchecked cast that it is warning you about.

so its telling the compiler to ignore all warnings of type "unchecked", and to stop displaying warnings about them.