That´s what they say at sun:
The Sun Certified Associate for the Java Platform, Standard Edition, Exam Version 1.0 certification exam provides an ideal entry into an application development or a software project management career using Java technologies. This worldwide credential validates basic knowledge of Object-Oriented Concepts, UML representation of OO concepts, the Java programming language, and general knowledge of Java Platforms and Technologies. Candidates for this exam include: entry level Java programmers, students studying to become Java programmers, project or program managers working with Java technology in the software development industry.
I did this certification last year and it was fairly easy. Few basic class-diagram UML questions (see Resources), very basic java language and a few j2ee overview questions.
Anyone with a decent knowledge of java and related technologies should be able to clear this exam without any trouble or preperation.
Resources:
