Bug in JDBC URL for H2 when generating from starter or Helidon CLI

[hyder]

"A slash is missing in the JDBC url when using the H2 database"

Environment Details

• Helidon Version: 4.0.0
• Helidon SE or Helidon MP: SE
• JDK version: Java(TM) SE Runtime Environment Oracle GraalVM 21.0.1+12.1 (build 21.0.1+12-jvmci-23.1-b19)
• OS: WSL on Windows
• Docker version (if applicable): NA

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Problem Description

The currently generated url for H2 is url: "jdbc:h2:tcp://localhost:9092/~test".

This is incorrect and results in the application unable to connect to the H2 database.
The correct URL is "jdbc:h2:tcp://localhost:9092/~/test"

Steps to reproduce

• Generate a project using either the CLI or the starter and select H2 as database.
• Start the application. This will result in failed connections.
• Add the missing slash before the database name. The application will now start properly

[tvallin]

This issue is fixed by #7877 and will be part of 4.0.1 release.