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Jackson 3 series companion code

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37 runnable examples covering the eight feature posts on ankurm.com, verified
against Jackson 3.2.1 on Temurin 21.0.5. Every output committed under docs/ was
produced by run-all.sh.

Also documents 11 places where the published snippets do not compile or do not
behave as printed against a real Jackson 3 build - most notably that
writeValueAsString(List<Base>) silently drops the polymorphic type discriminator,
so the post's serialised output cannot be read back.
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Ankur
2026-08-04 23:12:11 +05:30
commit c438afc33b
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ankurm</groupId>
<artifactId>jackson3-by-example</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>jackson3-by-example</name>
<description>Runnable companion code for the Jackson 3 series on ankurm.com</description>
<properties>
<!-- Jackson 3 requires Java 17+. Verified on Temurin 21.0.5. -->
<maven.compiler.release>21</maven.compiler.release>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<jackson.version>3.2.1</jackson.version>
</properties>
<dependencyManagement>
<dependencies>
<!-- The BOM aligns jackson-core, jackson-databind AND the jackson-annotations
version that Jackson 3 expects. Import it instead of pinning each artifact. -->
<dependency>
<groupId>tools.jackson</groupId>
<artifactId>jackson-bom</artifactId>
<version>${jackson.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Jackson 3 lives at tools.jackson.core, NOT com.fasterxml.jackson.core.
jackson-databind pulls in jackson-core and jackson-annotations transitively.
jackson-annotations deliberately stays on the com.fasterxml.jackson.core
group ID (2.22 as of Jackson 3.2.1) so it can be shared with Jackson 2. -->
<dependency>
<groupId>tools.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.6.3</version>
</plugin>
</plugins>
</build>
</project>