Java Thread Safety - Lock an entire static class but only for one method

I have a Static helper class implemented that helps cache and retreive some read-only, non-mutable, non-volatile data from the database.

(Stripped) Example:

public class CacheHelper
{
    private static HashMap foos, bars;

    public static Foo getFoo(int fooId) { /* etc etc */ }
    public static Bar getBar(int barId) { /* etc etc */ }

    public static void reloadAllCaches()
    {
        //This is where I need it to lock access to all the other static methods
    }
}

The way I've read it for static classes, If I add the synchronized keyword to the reloadAllCaches() method, this will apply a lock on the entire class while that method executes. Is this correct? (Edit: Yep, not correct. Thanks for the responses. )

Note: I would like to remain agnostic to the thread safety of the getter methods and the objects they return as this data is never mutated and would like it to be returned as fast as possible.