Error when upgrading jackson-databind, jackson-core to version 2.15.0-rc1

[silver11235]

Hello All,

I am working on a project with JDK 8 at the moment and is trying to upgrade my current com.fasterxml.jackson.core jackson-databind to 2.15.0-rc1. The current version is 2.14.0. But when I do so I was given the this error

From my reading on the wiki page, the build JDK is require to be JDK 11 but platform should be the same for 2.14.0, then how come it unable to make the build?

[pjfanning]

Are you sure that this is not an issue in your build config? Could you have set up maven-enforcer plugin to ban jars that have rc in their names?

[silver11235]

Hello @pjfanning,

Yes I have double check config of my enforcer. I did not to excludes or ban any jars.

[cowtowncoder]

Jackson 2.15 should still only require Java 8 for most things, including jackson-core.

But looking at error message, it looks like some tool is incorrectly trying to load JDK11-only code; 2.15.0 is "multi-version jar".
Could it be that your version of Enforcer plug-in is old and new versions might handle it better?

There have been reports of something similar wrt older versions of Gradle having issues with this:

FasterXML/jackson-core#955

[silver11235]

Hello @cowtowncoder, so I just check the version for my Enforcer, it is 3.0.0-M2. Do you have any suggestion that I should make an update for that also?

[cowtowncoder]

@silver11235 There are newer versions so you could try using 3.3.0 and see if that helps. If not, perhaps enforcer plug-in has some configuration to avoid this false alert. The thing is, bytecode under META-INF/versions/11 should only be used on JVMs 11 and above -- but maybe enforcer plug-in is not considering this logic.

[silver11235]

@cowtowncoder so I updated the version to 3.3.0 but still the same issue. Below is the configuration I take for enforce plugin.

[cowtowncoder]

Ok. Perhaps you need to exclude checking for jackson-core altogether then; or possibly specific classes.
Optionally loaded classes are in package com/fasterxml/jackson/core/io/doubleparser and included in a way that JVM only loads them as overrides for specific JDK: they come from "FastDoubleParser" project.
They should not cause issues when running on earlier JDK versions: that's the whole point of multi-release (MR) jars.

[silver11235]

Hi so I guess exclude the jackson-core will do the trick, need to add exclude tag within enforceBytecodeVersion.

Thanks @cowtowncoder for the support.

[aalmiray]

As far as I can tell, latest versions of maven-enforcer-plugin and extra-enforcer-rules work out of the box.

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
    xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.acme</groupId>
    <artifactId>project1</artifactId>
    <version>0.0.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.15.0-rc1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-enforcer-plugin</artifactId>
                <version>3.3.0</version>
                <dependencies>
                    <dependency>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>extra-enforcer-rules</artifactId>
                        <version>1.6.2</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <goals>
                            <goal>enforce</goal>
                        </goals>
                        <phase>validate</phase>
                        <configuration>
                            <rules>
                                <enforceBytecodeVersion>
                                    <maxJdkVersion>8</maxJdkVersion>
                                </enforceBytecodeVersion>
                            </rules>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

$ gm validate 
Using maven at '/Users/aalmiray/.sdkman/candidates/maven/current/bin/mvn' to run buildFile '/tmp/foo/pom.xml':
[INFO] Scanning for projects...
[INFO] 
[INFO] -------------------------< com.acme:project1 >--------------------------
[INFO] Building project1 0.0.0-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- enforcer:3.3.0:enforce (default) @ project1 ---
[INFO] Adding ignore: module-info
[INFO] Rule 0: org.apache.maven.plugins.enforcer.EnforceBytecodeVersion passed
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.323 s
[INFO] Finished at: 2023-04-12T18:34:37+02:00
[INFO] ------------------------------------------------------------------------

The jackson-databind JAR appears to be in order

$ jarviz manifest query --gav com.fasterxml.jackson.core:jackson-databind:2.15.0-rc1 --attribute-name Multi-Release
subject: jackson-databind-2.15.0-rc1.jar
Multi-Release: true

$ jarviz bytecode show --gav com.fasterxml.jackson.core:jackson-databind:2.15.0-rc1
subject: jackson-databind-2.15.0-rc1.jar
Unversioned classes. Bytecode version: 52 (Java 8) total: 775
Versioned classes 9. Bytecode version: 53 (Java 9) total: 1

[cowtowncoder]

Thank you @aalmiray ! I was assuming @silver11235 had tried out upgrade like I suggested but.... maybe not?

[aalmiray]

FWIW versioned classes are excluded by default unless strict is set to true

https://github.com/mojohaus/extra-enforcer-rules/blob/582a916082ca57fcf80791adb7cb08c51119db32/src/main/java/org/apache/maven/plugins/enforcer/EnforceBytecodeVersion.java#L172-L175