[JENKINS-36718] Spotbugs: DM_DEFAULT_ENCODING issues in core

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Description

Contributor guide

Research direction

Search for `DM DEFAULT ENCODING` warnings in FindBugs/SpotBugs reports. Identify the specific core components and files mentioned. Fix by specifying charset encoding (e.g., UTF 8) explicitly when using FileReader, FileWriter, or `new String(bytes)`.

Tech stack

java

Domain

backend

Issue type

Bug

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

3

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

Half day

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.

Mostly clear

Prerequisites

JavaJenkins

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

70