Discussion I haven't even opened a single server yet, and I'm already o

[zambog420]

I have browsed this forum for months, witnessing the infinite and endless debate over which datapack is better, whether one is leaked or another is stolen. I constantly see developers from different projects throwing mud at each other for their own convenience. For a novice 27-year-old developer with a dream, all of this is disheartening. Opening a Lineage 2 server in 2026 seems like a titanic goal when looking for stability and scalability. The thought of depositing my only savings into one of these datapacks, praying to God that everything goes well, is terrifying.

This is not a destructive critique of any forum member or developer. It is simply a call for reflection: What are we doing for the original essence of Lineage 2? Have we forgotten those memories from when we were young, going to a cybercafé to play for 12 hours straight just to grind a few levels?

It seems that instead of providing a quality server to the community—a place where our inner child can enjoy the game—this has become a race where the only prize is money, at the cost of progressively destroying the game's community. Is there actually anyone or any project thinking about this? I know that invested time requires financial return; obviously, we all need to survive and eat. But friends... that isn't everything. Currently, in Argentina, 100% of the servers are garbage and last approximately one month. Corrupt admins, illegal item sales for quick profit, and endless toxic practices.

Since I couldn't find the answers I needed, I tasked a generic AI (Google Gemini) with creating an extensive report on datapacks, history, competition, and current objectives. I am leaving it here for anyone who wants to read it.

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Comprehensive Research Report: The State of the Lineage 2 Java (L2J) Emulation Ecosystem 2020-2026

1. Executive Summary and Strategic Scope

The landscape of Java-based Lineage 2 (L2J) server emulation has undergone a radical metamorphosis between 2020 and 2026. What began in the early 2000s as a scattered community effort to reverse-engineer a Korean MMORPG has consolidated by 2026 into a highly sophisticated software development sector. This report aims to provide the definitive guide and the most comprehensive technical analysis available in the market regarding the selection, architecture, and viability of L2J datapacks.

A clear bifurcation in development philosophy has been identified: on one side, massive, chronicle-agnostic open-source projects, indisputably led by L2JMobius (and its strategic transition to the MIT license in 2025); and on the other, highly specialized niche projects like aCis (for Interlude) and L2JEternity (for High Five), which prioritize architectural purity and extreme performance through the early adoption of JDK 25.

This document not only evaluates "completeness" in terms of game content but also dissects technical debt, legal security, and long-term sustainability.

1.1 Evaluation Methodology To determine the "best" datapack, we applied a multidimensional evaluation matrix:

• Architectural Integrity: Analysis of code quality, thread management, and modern design patterns.

• Lifecycle Maturity: Update frequency and leadership stability.

• Tool Ecosystem: Availability of client editors, geodata generators, and compatible anti-bot systems.

• Commercial Viability: Ability to sustain a stable economy and support high concurrency loads (500+ simultaneous players).

2. The Technological Revolution: From Java 8 to Java 25 (2020-2026)

One of the most critical findings is the quantum leap in the underlying infrastructure. The 2023-2026 period has witnessed a technological arms race.

2.1 The Impact of JDK 25 on Emulation Vanguard projects like L2JEternity and the main branches of L2JMobius completed the migration to JDK 25.

• Garbage Collection (GC): The implementation of ZGC and Shenandoah has solved the historic problem of "GC pauses" (lag due to memory cleaning). With JDK 25, these pauses are sub-millisecond, allowing for fluid massive combat (Sieges).

• Virtual Threads (Project Loom): This allows handling thousands of simultaneous connections and AI tasks without the excessive cost of traditional OS threads.

2.2 Network Layer Modernization (Netty) The old MMOcore-based architecture has been replaced or heavily refactored using Netty, optimizing the packet pipeline and improving security against application-layer DDoS attacks.

2.3 Tech Stack Comparison | Project | Java Version (2025/26) | Database | Status | | :--- | :--- | :--- | :--- | | L2JMobius | JDK 21 / 25 | MySQL / MariaDB | Active (MIT) | | L2JEternity| JDK 25 | MySQL | Active (Private) | | aCis | JDK 11 / 17 | MySQL | Active (Private) | | L2JFrozen/Brasil | JDK 7 / 8 | MySQL | Obsolete / Risk |

3. L2JMobius: The Open Source Hegemon

L2JMobius emerges as the definitive answer for the vast majority of use cases in 2026, based on three pillars: universality, legality, and tools.

• Universality: It maintains a unified architecture (monorepo) supporting everything from C1 to the most recent Essence versions. Core fixes propagate to all versions.

• MIT License (June 2025): A historic milestone allowing servers to modify code extensively and keep changes private without violating the license, legitimizing commercial use.

• Vertical Integration (L2ClientDat): The team actively maintains client editing tools, ensuring perfect compatibility with the latest protocols (e.g., Protocol 507).

4. The Battle for Interlude: Purism vs. Modernity

Interlude (C6) remains the most demanded version.

• aCis (The Gold Standard): Obsessed with code quality and "Retail" fidelity. Ideal for Low Rate servers (x1-x10). The free version is often stale; the paid version is the professional choice.

• L2JMobius Interlude: The practical "batteries included" alternative. Includes popular mods out of the box and benefits from the modern core. Ideal for Mid/High Rate PvP servers.

• Warning: L2JFrozen and L2JBrasil are considered obsolete and dangerous in 2026 due to security vulnerabilities and unmaintainable code.

5. The High Five Sector: Commercialization and Risks

• L2J Sunrise: Positions itself as a "turnkey" solution, but its closed code creates total vendor dependence. Risky for long-term projects.

• L2JEternity: The technical gem for advanced admins. Pioneer in JDK 25 and offers native support for protections like Strix and SmartGuard.

6. Essence and the Modern Era

For Essence, L2JMobius has no real competition in the free Java space, reacting to NCSoft updates with supernatural speed. Russian commercial alternatives (L2-Scripts) exist but come with high costs.

7. Ecosystem and Auxiliary Tools

• Geodata: Essential to avoid movement errors. 2026 hybrid engines reduce "wall-shooting."

• Vote Reward: Middleware systems like VDSystem or iTopZ are mandatory, and modern datapacks already include the necessary hooks.

8. Conclusions and Definitive Recommendations

After analyzing repositories and trends up to January 2026:

1. Overall Winner: L2JMobius. Best ratio of features/modernity/support.

2. Purist's Choice (Interlude): aCis. Unbeatable mechanical fidelity.

3. Performance Option (High Five): L2JEternity. Extreme optimization.

4. Final Warning: Strictly avoid L2JFrozen, L2JBrasil, and black-box projects like Sunrise for critical infrastructures.

[911reg]

Sadly we gotta choose between poop and shit, it is what it is.

[Splicho]

4 hours ago, zambog420 said:

 

6. Essence and the Modern Era

For Essence, L2JMobius has no real competition in the free Java space, reacting to NCSoft updates with supernatural speed. Russian commercial alternatives (L2-Scripts) exist but come with high costs.

Ehh so you just judge on if product is free or paid? Wtf.

You know that a price tag oftens value the quality of a product. So how you think that a free fork is superior to one that's been maintained for years and is paid?

Edited 18 hours ago by Splicho

[Nightw0lf]

15 hours ago, zambog420 said:

Vote Reward: Middleware systems like VDSystem or iTopZ are mandatory, and modern datapacks already include the necessary hooks.

I was not expecting either system to be mentioned but to update this information 

itopz is a topsite

VDSystem is a server vote system

 

as the creator i gave the vote system free but made mandatory to use my topsite

https://github.com/nightw0lv/VDSystem

download free, needs an extensive configuration and all java versions to be installed so it can befully be build, but only if you plan to maintain the full solution for all projects

in case you want to use only 1 project you just copy the files for example frozen
https://github.com/nightw0lv/VDSystem/tree/master/Interlude/Frozen

copy paste inside your project, apply the patch of call the main class to gameserver.java and done.

 

note for active projects minor changes will probably be required

 

about the latest version hopzone.eu my other topsite is also required to have a server and get an api key same reason system is free, appriciate it.

13 hours ago, 911reg said:

Sadly we gotta choose between poop and shit, it is what it is.

there is a huge difference

that also extends as example in l2j

Note to the topic owner @zambog420 lucera is also an option specially if you feel coding ready with intellij

 

[zambog420]

12 hours ago, Splicho said:

Ehh so you just judge on if product is free or paid? Wtf.

You know that a price tag oftens value the quality of a product. So how you think that a free fork is superior to one that's been maintained for years and is paid?

I never said that, can you read? Are you going to start an argument when that isn't the main goal of this post? Or are you just used to the same old discussion mechanics?

 

1 hour ago, Nightw0lf said:

I was not expecting either system to be mentioned but to update this information 

itopz is a topsite

VDSystem is a server vote system

 

as the creator i gave the vote system free but made mandatory to use my topsite

https://github.com/nightw0lv/VDSystem

download free, needs an extensive configuration and all java versions to be installed so it can befully be build, but only if you plan to maintain the full solution for all projects

in case you want to use only 1 project you just copy the files for example frozen
https://github.com/nightw0lv/VDSystem/tree/master/Interlude/Frozen

copy paste inside your project, apply the patch of call the main class to gameserver.java and done.

 

note for active projects minor changes will probably be required

 

about the latest version hopzone.eu my other topsite is also required to have a server and get an api key same reason system is free, appriciate it.

there is a huge difference

that also extends as example in l2j

Note to the topic owner @zambog420 lucera is also an option specially if you feel coding ready with intellij

 

 

Thank you very much for your recommendation. A few months ago, I worked on a project called 'L2Avalon' using a compiled Lucera2 (it was the only thing the project leader provided me), and based on my 20 years of experience playing Lineage 2, I feel like it's broken everywhere, unless the specific version of Lucera I was using was just old. I don't have a problem coding and fixing things, but I am looking for a solid base so I don't do unnecessary work.
 

Replying to the first guy: I would never discredit paid work; obviously, any paid work will be better than a free one for obvious reasons. But my reality is that I don't want to throw money away, mainly because saving up a large sum of money is a matter of several months in my current situation here in Argentina.