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Over the last years, Java gained popularity as a suitable programming language for embedded real-time systems. This popularity influenced the definition of the Real-Time Specification for Java (RTSJ), which constitutes a high-level programming interface for creating real-time applications using Java. The current work presents an API based on the RTSJ that optimizes real-time embedded systems development. Using the provided API, programmers can make use of high-level mechanisms to represent concurrency and timing constraints in their Java applications. The developed application can be further synthesized to a Java processor. The paper illustrates the use of the proposed API by means of a case study that implements a crane control system. This case study highlights the benefits and advantages on using the proposed API.