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Published Jul. 2, 2025

Exporting an empty package 'com.liferay.training.servicebuilder.gradebook.exception'

Written By

Rita Schaff

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Issue

  • I have tried to follow this tutorial:
    Back-End Developer - DXP 7.1 → Exercises: Create the Gradebook Service Layer - Steps 8-10,
  • When I try to deploy by dragging the project to the Liferay server, I get the following error message:
    modules:gradebook:gradebook-api:compileJava UP-TO-DATE
:modules:gradebook:gradebook-api:buildCSS UP-TO-DATE
:modules:gradebook:gradebook-api:processResources UP-TO-DATE
:modules:gradebook:gradebook-api:transpileJS SKIPPED
:modules:gradebook:gradebook-api:configJSModules SKIPPED
:modules:gradebook:gradebook-api:replaceSoyTranslation UP-TO-DATE
:modules:gradebook:gradebook-api:wrapSoyAlloyTemplate SKIPPED
:modules:gradebook:gradebook-api:classes UP-TO-DATE
:modules:gradebook:gradebook-api:jar[Exporting an empty package 'com.liferay.training.servicebuilder.gradebook.exception', Exporting an empty package 'com.liferay.training.servicebuilder.gradebook.model', Exporting an empty package 'com.liferay.training.servicebuilder.gradebook.service', Exporting an empty package 'com.liferay.training.servicebuilder.gradebook.service.persistence']

[aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.model.AssignmentModel. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.portal.kernel.model.BaseModel. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.model.Assignment. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.model.SubmissionModel. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.model.Submission. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.service.AssignmentLocalService. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.service.AssignmentService. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.service.SubmissionLocalService. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations., aQute.bnd.annotation.ProviderType annotation used in class com.liferay.training.gradebook.service.SubmissionService. Bnd versioning annotations are deprecated as of Bnd 3.2 and support will be removed in Bnd 4.0. Please change to use OSGi versioning annotations.]

FAILURE: Build failed with an exception.

* What went wrong:
Build has errors

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 1.156 secs

Environment

  • DXP 7.1

Resolution

  • The build error happens because the exporting package is empty, so the check exports cannot pass.
  • Before building the whole project, please
    1. Execute the buildService task first under gradebook-service project
    2. And after buildService, in the gradebook-api project, the export package for example is: 
      com.liferay.training.gradebook.exception
    3. Make sure that you have the same line in your bnd.bnd file's 4th line, like: 
      Bundle-Name: gradebook-apiBundle-SymbolicName: com.liferay.training.servicebuilder.gradebook.api
Bundle-Version: 1.0.0
Export-Package:\
 com.liferay.training.gradebook.exception,\
 com.liferay.training.servicebuilder.gradebook.model,\
 com.liferay.training.servicebuilder.gradebook.service,\
 com.liferay.training.servicebuilder.gradebook.service.persistence
-check: EXPORTS
-includeresource: META-INF/service.xml=../gradebook-service/service.xml
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