asmhatre/jackson2-to-3-migration
1
0
Fork 0
Code Activity

Jackson 2 to 3 migration companion code

Browse Source 
Three Maven modules - jackson2-before (2.22.1), jackson3-after (3.2.1) and a
coexistence module with BOTH majors on one classpath - so every claim in the two
migration guides is executed rather than asserted. Paired class names make the
before/after outputs directly diffable via run-all.sh.

Confirms the guides on wire-format equivalence (10-case suite, zero mismatches),
classpath coexistence and the collapse of four artifacts into one. Corrects nine
points, including that enableDefaultTyping() is still present in Jackson 2.22.1
rather than removed in 2.16, and that the published "after" mapper snippet does
not compile.
This commit is contained in:
Ankur
2026-08-04 23:12:25 +05:30
commit f0a7053fc9
43 changed files with 1665 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
pom.xml Normal file
View File

@@ -0,0 +1,40 @@
<?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>jackson2-to-3-migration</artifactId>
<version>1.0.0</version>
<packaging>pom</packaging>
<name>jackson2-to-3-migration</name>
<description>Side-by-side Jackson 2 and Jackson 3 code for the ankurm.com migration guides</description>
<modules>
<module>jackson2-before</module>
<module>jackson3-after</module>
<module>coexistence</module>
</modules>
<properties>
<!-- Java 17 is the Jackson 3 floor. Verified on Temurin 21.0.5. -->
<maven.compiler.release>21</maven.compiler.release>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<jackson2.version>2.22.1</jackson2.version>
<jackson3.version>3.2.1</jackson3.version>
</properties>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.6.3</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>