https://devops-monk.com/tags/nullpointerexception/Recent content in Nullpointerexception on Devops MonkHugoen-usMon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/java8/optional/Mon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/java8/optional/The Problem Optional Solves NullPointerException is the most common runtime exception in Java. The root cause is that null is used for two different things simultaneously: “This field has no value” (intentional absence) “This reference was never set” (programming error) Callers can’t tell which meaning applies without reading the documentation or source code. And nothing in the type system forces them to check. // Java 7: what does null mean here?