Question

I have below piece code which runs on JDK5

private static ThreadLocal<String> messages = new ThreadLocal<String>();
private static ThreadLocal<Boolean> dontIntercept = new ThreadLocal<Boolean>() {
    @Override
    protected Boolean initialValue() {
        return Boolean.FALSE;
        }
};

I wish to run it on JDK1.4. Please advice what changes will be required

Answer 1

• Remove generics.
• Remove covariant return.
• Remove @Override annotation.

So

private static final ThreadLocal messages = new ThreadLocal();
private static final ThreadLocal dontIntercept = new ThreadLocal() {
    protected Object initialValue() {
        return Boolean.FALSE;
    }
};

When using

• Cast value back to Boolean.
• Unbox with .booleanValue().
• Box with Boolean.valueOf.