When coding on any platform, you can sometimes run into issues that have no clear resolution. This can be particularly frustrating. If you have issues building, deploying, or running apps and modules, you want to resolve them fast. These frequently asked questions and answers help you troubleshoot and correct problems.
Here are the troubleshooting sections:
Click a question to view the answer.
When developing modules, you can declare optional package imports. An optional package import is one your module can use if it's available, but can still function without it. Specifying optional package imports is straightforward.
Connecting to an application server's JNDI data sources from Liferay's OSGi environment is almost the same as connecting to them from the Java EE environment. In an OSGi environment, the only difference is that you must use Liferay DXP's class loader to load the application server's JNDI classes.
If one of your bundles imports a package that no other bundle in the Liferay OSGi runtime exports, Liferay DXP reports an unresolved requirement:
! could not resolve the bundles: ... Unresolved requirement: Import-Package: ... ... Unresolved requirement: Require-Capability ...
To satisfy the requirement, find a module that provides the capability, add it to your build file's dependencies, and deploy it.
Services and Components
module components that use Service Builder use Dependency Manager (DM) and most other module components use Declarative Services (DS). Gogo shell commands and tools help you find and inspect unsatisfied component references for DM and DS components.