What to Do If an Assertion Fails

An assertion is a statement in Java TM programming language that tests the assumptions that you make about the behavior of your program. For example, an assert will calculate the particle speed if it is faster than light. An assertion is a boolean expression that must be true in order to be executed. An assertion demonstrates that the program is logically correct and increases your confidence that it is safe to use. However, if an assertion fails, there are a few things you should do.


The first part of an assertion is a detail message. This message reflects the actual details of an assertion failure and allows you to diagnose and resolve it. It is not a user-level error message and should be internationalized. It should be interpreted in the context of the full stack trace and the source code. This is an important part of the documentation of your asserts. It’s the most important part of your program. The rest of the code will not be as clear.


A detail message is a snippet of text that captures the details of an assertion failure. It should allow you to diagnose and fix the problem. This message is not a standard error message that the user sees, and it shouldn’t be translated into another language. It should be interpreted in the context of a complete stack trace or source code. It should also be a concise, meaningful, and clear description of the problem.

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