2.x: MP quickstart fails to start: Error: Could not find or load main class

[barchetta]

Environment Details

• Helidon Version: 2.6.6-SNAPSHOT
• Helidon MP
• JDK version:
  java 11.0.11 2021-04-20 LTS
  GraalVM 21.3.0 Java 11 CE (Java Version 11.0.13+7-jvmci-21.3-b05)

---

Problem Description

If you build quickstart-mp that is generated from the Helidon archetype the resulting application jar won't run:

java -jar target/quickstart-mp.jar
Error: Could not find or load main class me.jdipol.mp.quickstart
Caused by: java.lang.ClassNotFoundException: me.jdipol.mp.quickstart

This is working with Helidon 2.6.5

Steps to reproduce

Build the archetype in the helidon-2.x branch and run:

helidon init --reset --reset --url file:///path/to/helidon-2.x-repo/archetypes/catalog/target/cli-data
# Select MP, quickstart and accept other defaults
mvn clean install 
java -jar target/quickstart-mp.jar

Note: to run the helidon CLI this way you'll want the change in PR #8463

[barchetta]

This might be related to #8332

The mainClass property in the pom.xml is not set correctly:

        <properties>
            <mainClass>me.jdipol.mp.quickstart</mainClass>
        </properties>

[tvallin]

fixed by #8465