aka 24 for 21 — One of my New Year’s goals — not a public one, just personal — for 2021 was that I would write and publish at least TWO blog posts every single month. I am very close to achieving this goal: not counting this post (I could, but that’d be bit meta), I…

(because it does not use either logging framework) — TL;DNR; Before explaining things in more details, I will make a simple statement: neither core Jackson library nor any of its FasterXML-maintained extension modules use either Log4j or Logback logging frameworks. …

aka How to read Broken JSON with Jackson — author’s note: (paraphrasing Tolstoy) all compliant JSON looks alike; but all non-compliant content is broken in its own way. Background: why/whence invalid JSON? JSON format is rather simple as far as data formats go — just check out https://www.json.org/ for the original specification — and so it would make sense that everyone would simply…

aka ObjectReader/ObjectWriter, JsonMapper.builder FTW — “Classic” Jackson API w/ ObjectMapper The most often used class in the whole Jackson databind API is — without question — ObjectMapper. ObjectMapper has been around since Jackson 0.9.5 and has methods for reading and writing JSON (*), for converting structurally compatible values, and for configuring details of these operations. …

Jackson 2.13.0 was officially released at the very end of Q3 of 2021. It includes almost 100 changes (bug fixes, new features). Since I… — Jackson 2.13.0 was officially released at the very end of Q3 of 2021. It includes almost 100 changes (bug fixes, new features). Since I wrote “Sneak Peek at Jackson 2.13” …

“How to use jackson-dataformat-csv, part 2” — Now that we know how to read CSV with Jackson… Ok, so the assumption is that you have read my earlier post (Reading CSV with Jackson) — if not, it would probably make sense to do that first as I will be expanding on some of the aspects without repeating explanations. But here’s a brief recap: While Jackson started as…

aka “No Need to Convert from Map to JsonNode” — Jackson works with All Kinds of Java Types Jackson library allows use of all kinds of Java object types to represent JSON data to read and write: from java.util.Maps, java.util.Collection s and arrays to “Plain Old Java Object” (POJOs, aka Beans), as well as most scalar JDK types (Strings, Numbers, Booleans, Date/Time values). …

aka “Why is UUID.fromString() so slow?” — Background Similar to my recent adventure into evaluating performance of String.format() for simple String concatenation, I found another potentially meaningful case of widely used (and useful) JDK-provided functionality that seems to significantly under-perform: decoding of java.util.UUID from a String: UUID uuid = UUID.fromString(request.getParameter("uuid"));

While the final Jackson 2.13.0 is not yet out — there are, however, two release candidates, 2.13.0-rc1 and 2.13.0-rc2 — it’s a good time… — While the final Jackson 2.13.0 is not yet out — there are, however, two release candidates, 2.13.0-rc1 and 2.13.0-rc2 — it’s a good time to check out what will be included. 2.13: a bit smaller release again First things first: whereas Jackson 2.12 release was stock full of new features, 2.13 was planned to be a…