Is the ACM JTF's Java libraries used in real life, or just prepared for students to make their study less complicated?
According to the ACM Java Task Force charter:
To review the Java language, APIs, and tools from the perspective of introductory computing education and to develop a stable collection of pedagogical resources that will make it easier to teach Java to first-year computing students without having those students overwhelmed by its complexity.
So I doubt any of their code is actually intended for use in "real life" projects...