FindBugs warning on ThreadLocal init

Question

I have ThreadLocal instance which was initialized with overridden initValue method. Also I have annotated it with @edu.umd.cs.findbugs.annotations.SuppressWarnings("SIC_INNER_SHOULD_BE_STATIC_ANON") as follows.

@edu.umd.cs.findbugs.annotations.SuppressWarnings("SIC_INNER_SHOULD_BE_STATIC_ANON")
private ThreadLocal<Integer> dbSwitchCount=new ThreadLocal<Integer>() {
    @Override 
    protected Integer initialValue() {
        return 0;
    }
};

Still Sonar report complains about "Performance - Could be re factored into a named static inner class". How can I make sure the above complain being ignored or what best way I can avoid that complain.

Answer 1

Do what Sonar suggests "Could be re factored into a named static inner class".

Named static inner class:

class MyClass {
    static class MyThreadLocal extends ThreadLocal<Integer> {
        @Override 
        protected Integer initialValue() {
            return 0;
        }
    }
    private ThreadLocal<Integer> dbSwitchCount = new MyThreadLocal();
}

I think the reason Sonar thinks that's a "Performance" improvement is because the anonymous class is non-static, and making it static improves memory management.