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In this chapter, we will look into some of the more advanced issues related to data synchronization. When you write a Java program that makes use of several threads, issues related to data synchronization are those most likely to create difficulties in the design of the program, and errors in data synchronization are often the most difficult to detect, since they depend on events happening in a specific order. Often an error in data synchronization can be masked in the code by timing dependencies. You may notice some sort of data corruption in a normal run of your program, but when you run the program in a debugger or add some debugging statements to the code, the timing of the program is completely changed, and the data corruption no longer occurs.