flatMapPrefix in javadsl should better be `java.util.List` instead of `java.lang.Iterable`

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Description

Contributor guide

Research direction

Locate the flatMapPrefix method in the Java DSL (javadsl) and change its return type from java.lang.Iterable to java.util.List. Ensure all overrides and implementations are updated, and verify that the change compiles and passes existing tests.

Tech stack

javascala

Domain

backendapi

Issue type

Refactor

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

GitJavaAkka basics

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

65