For many years, Liferay developers relied on the Plugins SDK to customise and extend portal functionality. While this approach worked well in earlier versions, modern enterprise environments require more flexible, cloud-ready, and upgrade-friendly solutions. Liferay Client Extensions now provide a cleaner and more scalable alternative.
Understanding the Legacy Plugins SDK
The Plugins SDK was traditionally used for:
- ▸Portlets
- ▸Hooks
- ▸Themes
- ▸Layout templates
- ▸Ext plugins
- ▸WAR-based deployments
These components were tightly integrated with the Liferay platform. Although powerful, this created several long-term challenges.
Problems with Traditional Plugin Development
Tight Coupling
Customisations often depended heavily on internal platform behaviour.
Difficult Upgrades
Version upgrades became time-consuming due to dependency conflicts.
Deployment Complexity
WAR deployments increased operational overhead.
Higher Maintenance Costs
Custom code frequently required major rework during upgrades.
These issues became more significant as organisations adopted cloud-native architectures.
What Are Liferay Client Extensions?
Client Extensions provide a modern mechanism for extending Liferay without modifying the platform core. They are lightweight, modular, and API-driven.
Instead of embedding customisations directly into the application server, Client Extensions operate independently through:
- ▸APIs
- ▸Frontend assets
- ▸Remote services
- ▸External applications
This reduces risk and improves maintainability.
Benefits of Client Extensions
Easier Upgrades
Because customisations are decoupled from the core platform, version upgrades become significantly smoother.
Cloud Compatibility
Client Extensions align naturally with cloud-native deployment strategies.
Faster Development Cycles
Frontend and backend teams can work independently.
Better Security and Stability
Isolated components reduce the likelihood of platform-wide issues.
Technology Flexibility
Teams can use modern frameworks and tools more freely.
Migration Strategy from Plugins SDK
A successful migration requires careful planning.
Step 1 — Audit Existing Plugins
Identify all custom portlets, hooks, and themes.
Step 2 — Categorise Business Importance
Determine which components are still actively used.
Step 3 — Replace High-Risk Customisations First
Focus on upgrade blockers and tightly coupled components.
Step 4 — Introduce API-Driven Architecture
Move business logic into external services where possible.
Step 5 — Modernise Frontend Delivery
Use Client Extensions for lightweight UI enhancements.
Best Practices for Modern Liferay Development
- ▸Keep extensions lightweight — avoid unnecessary platform dependencies
- ▸Use APIs wherever possible — API-driven architecture improves scalability
- ▸Standardise frontend tooling with consistent build processes
- ▸Improve CI/CD processes — automated pipelines reduce operational risk
- ▸Document customisations clearly to simplify future upgrades
Final Thoughts
Liferay Client Extensions represent a major evolution in enterprise portal development. Moving away from the traditional Plugins SDK helps organisations reduce technical debt, improve upgrade readiness, and support modern cloud-based delivery models.
For teams planning future Liferay upgrades, modernising extension architecture should be a high priority.
References
- —Liferay Client Extension documentation