tools awaiting common changeable information bugs java

i have infinite leave component maintain. codebase uses threads over place those threads share lot changeable data. i know, sounds bad. anyway, don't answer "rewrite whole concentration scratch" i'll opinion down :-) i have attempted run stationary research collection codebase, nonetheless zero those seem locate box occurs lot the source code: churned threads reading minute variables noted flighty synchronized during all. typically occurs "runflag"-type variables. an instance effective java 2nd book page 260:

public category stopthread
{
    private stationary boolean stoprequested;
    open stationary vacant main(string[] args) throws interruptedexception
    {
        thread backgroundthread = new thread(new runnable()
        {
            open vacant run()
            {
                int i = 0;
                while (!stoprequested)
                {
                    i++;
                }
            }
        });
        backgroundthread.start();
        thread.sleep(1000);
        stoprequested = true;
    }
}

this instance never finishes windows/linux "-server" startup parameter given object jvm. so, there any (semi-)automatic proceed issues, i have rest totally formula reviews?