Hello everyone,

We are two students from ITU writing a Research Project on Apache Wayang with 
our supervisor @Zoi Kaoudi<mailto:z...@itu.dk>.

We are trying to get started downloading and using Wayang, but we recieve the 
following errors:

[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.apache.wayang:wayang-jdbc-template:jar:0.7.1
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must 
be unique: org.apache.wayang:wayang-spark:jar -> duplicate declaration of 
version 0.7.1 @ line 86, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten 
the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support 
building such malformed projects.
[WARNING]
[INFO]
[INFO] -----------------< org.apache.wayang:wayang-assembly >------------------
[INFO] Building Wayang Project Assembly 0.7.1
[INFO] --------------------------------[ pom ]---------------------------------
[WARNING] The POM for org.apache.wayang:wayang-ml4all:jar:0.7.1 is missing, no 
dependency information available
[WARNING] The POM for org.apache.wayang:wayang-api-json:jar:0.7.1 is missing, 
no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.711 s
[INFO] Finished at: 2024-09-02T15:30:08+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project wayang-assembly: Could not resolve 
dependencies for project org.apache.wayang:wayang-assembly:pom:0.7.1: The 
following artifacts could not be resolved: 
org.apache.wayang:wayang-spark:jar:0.7.1, 
org.apache.wayang:wayang-api-scala-java:jar:0.7.1, 
org.apache.wayang:wayang-benchmark:jar:0.7.1, 
org.apache.wayang:wayang-flink:jar:0.7.1, 
org.apache.wayang:wayang-ml4all:jar:0.7.1, 
org.apache.wayang:wayang-api-json:jar:0.7.1: 
org.apache.wayang:wayang-spark:jar:0.7.1 was not found in 
https://repo.maven.apache.org/maven2 during a previous attempt. This failure 
was cached in the local repository and resolution is not reattempted until the 
update interval of central has elapsed or updates are forced -> [Help 1]
[ERROR]


It happens on both our computers.

We are following this guide: 
https://github.com/apache/incubator-wayang/blob/main/guides/tutorial.md

And it happens when running the following prompt:

./mvnw clean package -pl :wayang-assembly -Pdistribution

Does anyone know what the solution to this problem is?

We have maven installed, with the following version:

Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Maven home: /opt/homebrew/Cellar/maven/3.9.9/libexec
Java version: 22.0.2, vendor: Homebrew, runtime: 
/opt/homebrew/Cellar/openjdk/22.0.2/libexec/openjdk.jdk/Contents/Home
Default locale: en_DK, platform encoding: UTF-8
OS name: "mac os x", version: "12.5", arch: "aarch64", family: "mac"

And Java:

openjdk version "17.0.8" 2023-07-18
OpenJDK Runtime Environment Temurin-17.0.8+7 (build 17.0.8+7)
OpenJDK 64-Bit Server VM Temurin-17.0.8+7 (build 17.0.8+7, mixed mode, sharing)

We are looking forward to hear from you.

Best regards,

Christoffer Kristensen and @Jeppe Nordvi Halvorsen<mailto:h...@itu.dk>

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