JLS 13.4.9 has the following:

==========
We note, but do not recommend, that if a field of primitive type of an
interface may change, its value may be expressed idiomatically as in:
    ...
    boolean debug = new Boolean(true).booleanValue();
    ...
==========

This is not incorrect, but it uses the Boolean constructor, which is usually unnecessary and whose use is discouraged. I believe that all that's necessary here is to get a boolean value from an expression that's not a compile-time constant, so the following should be sufficient:

    boolean debug = Boolean.valueOf(true).booleanValue();

Perhaps the JLS 13.4.9 example could be changed to use this instead.