Epic: IntelliJ warmup in prebuilds

Summary

Improving experience for JVM users using IntellJ with prebuilds

Context

• JetBrains is also focusing on this during 2023 Q1: https://youtrack.jetbrains.com/issue/IJPL-30/IntelliJ-Warm-up-iImplementation

• In Q4 of 2022 we worked on improving Maven prebuilds using hacks or workarounds on Gitpod's side: https://github.com/gitpod-io/gitpod/issues/6740

Value

JVM users using IntellJ have a great experience using Gitpod

Acceptance Criteria

• IDE opens fast and smart features like code completion is available immediately (pre-indexing works)
• IDE pick ups up right config (e.g user configured JDK) without any hacks on our side
• At least one project for Maven and Gradle are used to test

Measurement

We observe usage of IntellJ increase for JVM users

Growth Area

No response

Persona(s)

No response

Hypothesis

No response

In scope

No response

Out of scope

No response

Complexities

No response

Press release

No response

Relates issues

• https://github.com/gitpod-io/gitpod/issues/15114

Start by reviewing the related issues 6740 and 15114 and the IntelliJ warmup context linked in the issue. Define how prebuilds should support IntelliJ for Maven and Gradle projects, including immediate indexing and configured JDK pickup. Done means both project types meet the listed acceptance criteria, but the issue names no files, tests, or implementation entry point.