We have not yet developed a Java SP800-90A implementation.  However, the default Unix (Solaris/Unix/Mac) solutions depend on the underlying OS, either PKCS11 or /dev/random & /dev/urandom.  I don't know what those use underneath. 

For Windows, the default is our old friend SHA1PRNG, which has not been formally evaluated by the evaluation programs, but in University/commercial studies it has held up well.