Web Reference: Jan 16, 2026 · In this blog, we will demystify this error, explore its root causes, walk through practical solutions, and share best practices to prevent it in your Java web services. Learn how to fix the "class java.lang.Long cannot be cast to class java.lang.Integer" error in Java. Step-by-step guide with examples. Sep 23, 2019 · Some JSON libs allow you to force integer numbers to be parsed as long, which would solve your issue altogether. Here is a solution for jackson (if that's what you're using)
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