Upgrading Portlets that use Service Builder

Liferay Portal CE 7.0 continues to use Service Builder, so you can focus on your application’s business logic instead of its persistence details. It still generates model classes, local and remote services, and persistence.

This tutorial demonstrates upgrading a Liferay Plugins SDK 6.2 portlet called Guestbook portlet (project guestbook-portlet). It’s from the Writing a Data-Driven Application section of the Liferay Portal 6.2 Learning Path Writing a Liferay MVC Application.


Figure 1: The Guestbook portlet to model guestbooks and guestbook entries.

To get the most from this tutorial, you can download and refer to the original portlet source code and the upgraded source code.

The Guestbook portlet has the following characteristics:

  • Extends MVCPortlet
  • Separate Model, View, and Controller layers
  • Persistence by Hibernate under Service Builder
  • View layer implemented by JSPs
  • Relies on manual dependency management
  • Developed in a Liferay Plugins SDK 6.2

Upgrading most Service Builder Portlets involves these steps:

  1. Adapt the code to Liferay Portal CE 7.0’s API
  2. Resolve dependencies
  3. Build the services

Start by adapting the code.

1. Adapt the code to Liferay Portal CE 7.0’s API

Use the Code Upgrade Tool to update the code and resolve compilation issues quickly. Then fix any remaining compilation errors manually.

The Guestbook portlet has the following compilation error:

/html/guestbook/view.jsp(58,1) PWC6131: Attribute total invalid for tag search-container-results according to TLD

The view.jsp file specifies a tag library attribute total that doesn’t exist in Liferay Portal CE 7.0’s liferay-ui tag library. Notice the second attribute total.

                    guestbookId, searchContainer.getStart(),
                    guestbookId)%>" />

Remove the total attribute assignment to make the tag like this:

                    guestbookId, searchContainer.getStart(),
                    searchContainer.getEnd())%>" />

That’s the Guestbook portlet’s only compilation error you need to fix manually.

2. Resolve dependencies

Since the Guestbook portlet’s dependencies haven’t changed, there aren’t any dependencies to resolve.

If you need to adapt a portlet’s dependencies, refer to tutorial Resolving a Plugin’s Dependencies.

3. Build the services

Build the services as you did in Liferay Portal 6.2.

The Guestbook portlet’s service.xml file specifies exception class names in exception elements.

<service-builder package-path="com.liferay.docs.guestbook">

In Liferay Portal 6.2, Service Builder generates exception classes to the path attribute package-path specifies. In Liferay Portal CE 7.0, Service Builder generates them to [package-path]/exception.

Old path:


New path:


For example, the Guestbook portlet’s package path is com.liferay.docs.guestbook. Its exception class for exception element GuestbookName is generated to docroot/WEB-INF/service/com/liferay/docs/guestbook/exception. Classes that use the exception must import com.liferay.docs.guestbook.exception.GuestbookNameException.

Update references to your portlet’s exception classes.

Deploy the portlet as you normally would. The server prints messages indicating the following portlet status:

  • WAR processing
  • WAB startup
  • Availability to users

Deploying the Guestbook portlet produces these messages:

19:36:27,591 INFO  [RMI TCP Connection(27)-][BaseAutoDeployListener:42] Copying portlets for C:\portals\liferay-ce-portal-7.0-ga3-upgrading-portlets\tomcat-8.0.32\temp\20170710193627556LFQNRFGO\guestbook-portlet-
19:36:27,973 INFO  [RMI TCP Connection(27)-][BaseDeployer:873] Deploying guestbook-portlet-
19:36:29,449 INFO  [RMI TCP Connection(27)-][BaseAutoDeployListener:50] Portlets for C:\portals\liferay-ce-portal-7.0-ga3-upgrading-portlets\tomcat-8.0.32\temp\20170710193627556LFQNRFGO\guestbook-portlet- copied successfully
19:36:31,231 INFO  [pool-23-thread-2][BundleStartStopLogger:35] STARTED guestbook-portlet_7.0.0.1 [496]
19:36:31,459 INFO  [pool-23-thread-2][HotDeployImpl:226] Deploying guestbook-portlet from queue
19:36:31,459 INFO  [pool-23-thread-2][PluginPackageUtil:1006] Reading plugin package for guestbook-portlet
10-Jul-2017 19:36:31.470 INFO [pool-23-thread-2] org.apache.catalina.core.ApplicationContext.log Initializing Spring root WebApplicationContext
19:36:31,934 INFO  [pool-23-thread-2][PortletHotDeployListener:202] Registering portlets for guestbook-portlet
19:36:32,008 INFO  [pool-23-thread-2][PortletHotDeployListener:331] 1 portlet for guestbook-portlet is available for use

The portlet is now available on Liferay Portal.

Congratulations on upgrading and deploying a portlet that uses Service Builder.

Related Topics

Migrating Plugins SDK Projects to Workspace and Gradle

Using Dependency Management Tools

Using the WAB Generator

Migrating Data Upgrade Processes

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