Web Reference: Jan 16, 2026 · In this blog, we’ll demystify this error by exploring the inner workings of Collections.copy(), why the "source does not fit in dest" exception occurs, and how to troubleshoot and prevent it. Jan 8, 2024 · In Java, making a copy of a List can sometimes produce an IndexOutOfBoundsException: “Source does not fit in dest”. In this short tutorial, we’re going to look at why we get this error when using the Collections.copy method and how it can be solved. We will explore common causes of this error and provide solutions to resolve it. If you are facing this issue in your Java code, this video will help you understand and fix it.
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