I get an error Recompile with -Xlint:unchecked for details. in Netbeans. Where can I find the option to uncheck?
You don't "uncheck" that option, you need to add the -Xlint:unchecked parameter to the parameters passed to the Java compiler.
For Ant based projects, this is done through Project Properties -> Build -> Compiling in the "Additional compiler options" input field at the bottom of the dialog (where it says "e.g.: -Xlint:unchecked")

For Maven projects see this answer
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