Web Reference: Discover how to resolve NullPointerExceptions in Java sorting with lambdas. Learn to sort collections while preserving nulls at the end of your list. It doesn't work when the mapper throws a NPE. In other words, in navigationCategoryModel.getReserveStockRuleSet().getCode(), it will work if getCode() returns null; not when getReserveStockRuleSet returns a null. Jan 16, 2026 · However, a common pitfall arises when sorting entities with null fields: if not handled carefully, null values can trigger a NullPointerException (NPE), crashing your application. In this blog, we’ll demystify how to safely sort entities with null fields using Comparator.
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