The diffoscope output for the module file is simple:
diffoscope
log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1.module
log4j-api/target/publications/maven/module.json
--- log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1.module
+++ log4j-api/target/publications/maven/module.json
├── Pretty-printed
│ @@ -5,15 +5,15 @@
│ },
│ "group": "org.apache.logging.log4j",
│ "module": "log4j-api",
│ "version": "2.25.1"
│ },
│ "createdBy": {
│ "maven": {
│ - "version": "3.9.8"
│ + "version": "3.9.10"
│ }
│ },
│ "formatVersion": "1.1",
│ "variants": [
│ {
│ "attributes": {
│ "org.gradle.category": "library”,
The diffoscope output for the other file has substantial changes (probably
related to version differences).
> On Jul 8, 2025, at 03:36, Piotr P. Karwasz <pi...@mailing.copernik.eu> wrote:
>
> Hi Matt,
>
> On 7.07.2025 22:34, Matt Sicker wrote:
>> Something is buggy for me in the Maven wrapper script which causes this
>> error to print out:
>>
>> mvnw: line 114: mvnw/.mvn/wrapper/maven-wrapper.properties: Not a directory
>> cannot read distributionUrl property in
>> mvnw/.mvn/wrapper/maven-wrapper.properties
>
> This is a known bug in Maven Wrapper—see Volkan's e-mail.
>
>> When I tried running the build with a local copy of Maven, I get a different
>> error:
>>
>> [ERROR] size mismatch log4j-api-2.25.1-sources.jar: investigate with
>> diffoscope
>> log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1-sources.jar
>> log4j-api/target/log4j-api-2.25.1-sources.jar
>> [ERROR] size mismatch log4j-api-2.25.1.module: investigate with diffoscope
>> log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1.module
>> log4j-api/target/publications/maven/module.json
>> [ERROR] Reproducible Build output summary: 3 files ok, 2 different
>> [ERROR] see diff log4j-api/target/reference/log4j-api-2.25.1.buildinfo
>> log4j-api/target/log4j-api-2.25.1.buildinfo
>>
>> The diff:
>
> As I’ve mentioned before—e.g., in a similar report from Gary[1]—running
> the final `diff` command is rarely useful. It only confirms that files
> differ (as already stated) and in this case, mainly reveals that your
> build was done on macOS.
>
> Instead, could you please run the `diffoscope` commands listed earlier
> in the output? These are much more helpful for diagnosing actual
> differences:
>
>
> diffoscope
> log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1-sources.jar
> log4j-api/target/log4j-api-2.25.1-sources.jar
> diffoscope
> log4j-api/target/reference/org.apache.logging.log4j/log4j-api-2.25.1.module
> log4j-api/target/publications/maven/module.json
>
> Piotr
>
> PS: I’ve submitted a bug report / feature request[2] to improve the
> clarity of this error message. If you have a moment, could you take a
> look and let me know if the suggestions make sense?
>
> [1] https://lists.apache.org/thread/q8vyzndb4g6sfzk0xw8ofgnfv32o6ox6
> [2] https://github.com/apache/maven-artifact-plugin/issues/175
>
>
>
>
