Error message "An unexpected error occured within com.liferay.portlet.exportimport.service.impl.ExportImportLocalServiceImpl" is displayed in case of importing a LAR with missing references of preloaded entries

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP FP58, 7.0.X, 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP71, 7.0.10.11 DXP SP11, 7.0.X, 7.1.10 DXP FP7, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: Content Publishing > Export/Import
• Labels:
  • QA-AUTOMATION
  • ee-ts
  • liferay-dxp-70-sp11
  • liferay-dxp-71-sp2
  • liferay-fixpack-de-71-7010
  • liferay-fixpack-dxp-7-7110
  • qa_test_mapped
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/66669
• Bug Type: Regression Bug

Error message "An unexpected error occured within com.liferay.portlet.exportimport.service.impl.ExportImportLocalServiceImpl" is displayed in case of importing a LAR with missing references of preloaded entries

Steps to reproduce with LAR file

1. You can reproduce an error there if you try to import following LAR file Public_Pages-20181219111553888.lar
2. In user interface, following error is displayed:
   • Expected behavior: A missing reference error is displayed
   • Wrong behavior: A generic error is displayed:

     The file Public_Pages-20181219111553888.lar cannot be imported.
     An unexpected error occured within com.liferay.portlet.exportimport.service.impl.ExportImportLocalServiceImpl.

   • Note: If LPS-88570 is fixed, in case of error an exception will be also dumped to log file:

     Caused by: java.lang.NullPointerException
             at com.liferay.document.library.internal.exportimport.data.handler.DLFileEntryTypeStagedModelDataHandler.fetchExistingFileEntryTypeWithParentGroups(DLFileEntryTypeStagedModelDataHandler.java:394)
             at com.liferay.document.library.internal.exportimport.data.handler.DLFileEntryTypeStagedModelDataHandler.validateReference(DLFileEntryTypeStagedModelDataHandler.java:162)
             at com.liferay.exportimport.internal.lar.ExportImportHelperImpl.validateMissingReference(ExportImportHelperImpl.java:1770)
             at com.liferay.exportimport.internal.lar.ExportImportHelperImpl$1.processElement(ExportImportHelperImpl.java:1376)
             at com.liferay.portal.kernel.xml.ElementHandler.endElement(ElementHandler.java:53)
             at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
             at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
             at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
             at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
             at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
             at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
             at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
             at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
             at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
             at com.liferay.portal.security.xml.StripDoctypeXMLReader.parse(StripDoctypeXMLReader.java:136)
             at com.liferay.exportimport.internal.lar.ExportImportHelperImpl.validateMissingReferences(ExportImportHelperImpl.java:1388)
             at com.liferay.exportimport.internal.controller.LayoutImportController.validateFile(LayoutImportController.java:283)
             at com.liferay.portlet.exportimport.service.impl.ExportImportLocalServiceImpl.validateImportLayoutsFile(ExportImportLocalServiceImpl.java:632)
             ... 202 more
     

Steps to reproduce without LAR file
If you want to regenerate LAR file, follow following steps:

1. Go to Global Site => Content => Document Library => Document Types
2. Export them to a LAR file
3. Create a site called site1 and import LAR file there, verify that now you have document types from global and site1
4. Go to Global Site => Content => Document Library => Document Types and delete all document types from this site
5. Create a site called site2
6. Add a page with a asset publisher
7. Configure asset publisher with document asset + all document types of site1
8. Export whole site2 to LAR file
9. Delete site1 and site2
10. Continue with the steps explained in Steps to reproduce with LAR file section