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Creating Job Scheduler Templates
Official Documentation
Creating Job Scheduler Templates Liferay Self-Hosted Liferay PaaS Job Scheduler Tasks are created by implementing the DispatchTaskExecutor interface. Liferay DXP provides multiple out-of-the-box...
Message Bus
Official Documentation
Message Bus The Message Bus provides a loosely coupled way to exchange messages. A class sending a message invokes the Message Bus to send the message to a destination, while other classes...
Using Default Synchronous Messaging in Previous Versions
Official Documentation
Using Default Synchronous Messaging in Previous Versions Liferay DXP 7.4 U48/Portal GA49 and Below In default synchronous messaging, the sender blocks while a Message Bus thread dispatches the...
Using Asynchronous Messaging
Official Documentation
Using Asynchronous Messaging Message Bus's asynchronous option provides fire and forget behavior; send a message and continue processing without waiting for a response. An asynchronous message is...
Using Direct Synchronous Messaging in Previous Versions
Official Documentation
Using Direct Synchronous Messaging in Previous Versions Liferay DXP 7.4 U48/Portal GA49 and Below Direct synchronous messaging is the easiest way to block processing until all listeners receive a...
Portlets
Official Documentation
Portlets Liferay DXP started off as a portal server for Java-based web applications called portlets (see JSR 168, JSR-286, and JSR-362). Portlets process requests and generate responses like any...
Portlet 3.0 API Opt In
Official Documentation
Portlet 3.0 API Opt In A portlet must specify version 3.0 to opt in to the Portlet 3.0 API. The 3.0 Portlet API version can be specified in the following ways. Standard Portlet @PortletApplication...
Implementing an Item Selector
Official Documentation
Implementing an Item Selector Item selectors are pop-up dialogs for selecting assets, such as documents, videos, or users. By configuring the item selector's criteria and defining its usage, you...
Enabling Assets
Official Documentation
Enabling Assets Many of Liferay's applications (e.g. Blogs, Documents and Media, Message Boards, etc.) are asset-enabled out of the box. You can publish assets with the Asset Publisher widget or...
Portlet Descriptor to OSGi Service Property Map
Official Documentation
Portlet Descriptor to OSGi Service Property Map Here's a map of portlet XML descriptor values to OSGi service properties for publishing OSGi Portlets. The properties centralize and simplify portlet...
Accessing Custom Fields With Expandos
Official Documentation
Accessing Custom Fields With Expandos When you need additional fields in your application, you can always add them in your service model definition and re-run Service Builder. This adds new columns...
Asset Framework
Official Documentation
Asset Framework The asset framework is behind many of Liferay's most powerful features. It provides tools for displaying and interacting with any type of content and data. For example, if you build...
Data Frameworks
Official Documentation
Data Frameworks
Cache
Official Documentation
Cache
Servlets
Official Documentation
Servlets
Data Scopes
Official Documentation
Data Scopes
Expando
Official Documentation
Expando Accessing Custom Fields with Expando
Portlet IDs
Official Documentation
Portlet IDs Below is a listing of the portlet IDs for the default portlets in Liferay DXP. You can use these IDs to embed portlets in your theme's sitemap. Collaboration PortletID...
Using Dynamic Query
Using Dynamic Query Liferay's Dynamic Query API wraps Hibernate's Criteria API. It helps you think in terms of objects and member variables instead of tables and columns. Complex queries can be...
Service Builder
Official Documentation
Service Builder An application without reliable business logic or persistence isn't much of an application at all. Unfortunately, writing your own persistence code often takes a great deal of time....
Using Custom SQL Queries
Using Custom SQL Queries Service Builder creates finder methods that retrieve entities by their attributes (their column values). When you add a column as a parameter for the finder in your...
Using Domain-Specific Language Queries
Using Domain-Specific Language Queries Liferay 7.4+ DSL Query is an acronym for Domain-Specific Language Query. The foundation is based upon using a domain-specific language for the...
Advanced Queries
Official Documentation
Advanced Queries Service Builder doesn't limit you to elements in service.xml. If simple finders aren't sufficient for getting data out of your application, there are three other ways to make the...
Connecting Service Builder to an External Database
Official Documentation
Connecting Service Builder to an External Database Service builder creates the necessary tables for the service in the lportal database with all other data used by Liferay. If you want to store the...
Defining Entity Columns
Official Documentation
Defining Entity Columns An entity's columns represent its attributes. These attributes map table fields to Java object fields. Here you'll examine the sample project from Understanding and...
Business Logic with Service Builder
Official Documentation
Business Logic with Service Builder Once you've generated model, persistence, and service code with Service Builder, you can begin adding business logic. Entities generated by Service Builder...
Defining Entity Relationships
Official Documentation
Defining Entity Relationships Relationships between database entities or Java objects are necessary for most applications. Take Liferay's Message Boards application as an example. Each Message...
Configuring Global Service Options
Official Documentation
Configuring Global Service Options A service's global options apply to all its entities. Here are the options: Dependency Injector Package path Multiversion concurrency control Namespace...
Defining Entity Finder Methods
Official Documentation
Defining Entity Finder Methods Finder methods retrieve entity objects from the database based on specified parameters. For each finder defined, Service Builder generates several methods to fetch,...
Adding Model Hints
Official Documentation
Adding Model Hints Once you've used Service Builder to define model entities, you may want to refine how users enter that data. Model hints specify entity data restrictions and other formatting....
Sorting Entity Instances
Official Documentation
Sorting Entity Instances Often, you want to retrieve multiple instances of a given entity and list them in a particular order. The service.xml file lets you specify the default order of your...
Configuring service.properties
Official Documentation
Configuring service.properties Service Builder generates a service.properties file in your *-service module's src/main/resources folder. Liferay uses this file's properties to alter your service's...
Defining Entities
Official Documentation
Defining Entities Entities are the heart and soul of a service. They represent the map between the model objects in Java and your database fields and tables. Service Builder automatically maps your...
Modifying Database Fields in Development
Official Documentation
Modifying Database Fields in Development As you develop an application, you might need to add fields to your database. This is a normal process of iterative development: you get an idea for a new...
Service Builder Basics
Official Documentation
Service Builder Basics Using Service Builder helps you learn it. You'll use it to learn the basics: Generating Model, Persistence, and Service Code: Define a basic model, generate code from it,...
Generating Model, Persistence, and Service Code
Official Documentation
Generating Model, Persistence, and Service Code Service Builder makes it easy to define models and generate model, persistence, and service code for them. You'll experience this by defining a model...
Understanding and Extending Generated Classes
Official Documentation
Understanding and Extending Generated Classes Service Builder generates both tables for your entity and model, persistence, and service classes for it. Here you'll examine generated classes for an...
Invoking a Service Locally
Official Documentation
Invoking a Service Locally Service Builder services that are deployed to DXP/Portal can be invoked from other classes in the same JVM. These services are local to the classes. Service Builder...
Upgrading Data Schemas
Official Documentation
Upgrading Data Schemas When you upgrade Liferay, you might run into incompatibility issues with your custom modules' data schemas. There are three ways you can resolve these issues: You can run...
Reference
Official Documentation
Reference