Unreferenced files uploaded to a portlet repository generate a "java.lang.RuntimeException: Unable to get class name from id 0" during the reindex process

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, 7.2.0 GA1, Master
• Fix Version/s: 7.1.10 DXP FP16, 7.1.X, 7.2.10 DXP FP1, 7.2.X, 7.2.1 CE GA2, 7.3.10 DXP GA1, Master
• Component/s: Documents & Media, Search Infrastructure
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-1-7210
  • liferay-fixpack-dxp-16-7110
• Branch Version/s:
  7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Sprint: 028 - Sandslash
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/74759

1. Create a web content structure with a image field
2. Create its template
3. Create a web content and select a new image uploading it to the Web Content Images tab
4. Without save the web content, select another image, adding it to the same section "Web Content Images"
5. Go to Control Panel > Configuration > Search > Reindex all search indexes

Error in log:

2019-06-18 08:27:36.943 ERROR [default-9][SearchPermissionCheckerImpl:143] java.lang.RuntimeException: Unable to get class name from id 0
java.lang.RuntimeException: Unable to get class name from id 0
	at com.liferay.portal.util.PortalImpl.getClassName(PortalImpl.java:1593)
	at com.liferay.portal.search.internal.SearchPermissionCheckerImpl.addPermissionFields(SearchPermissionCheckerImpl.java:112)
	at com.liferay.portal.search.internal.IndexWriterHelperImpl.updateDocuments(IndexWriterHelperImpl.java:616)
	at com.liferay.portal.kernel.dao.orm.IndexableActionableDynamicQuery.indexInterval(IndexableActionableDynamicQuery.java:128)
	at com.liferay.portal.kernel.dao.orm.IndexableActionableDynamicQuery.doPerformActions(IndexableActionableDynamicQuery.java:110)
	at com.liferay.portal.kernel.dao.orm.DefaultActionableDynamicQuery.performActions(DefaultActionableDynamicQuery.java:86)
	at com.liferay.portal.kernel.dao.orm.IndexableActionableDynamicQuery.performActions(IndexableActionableDynamicQuery.java:65)
	at com.liferay.portal.search.internal.batch.DynamicQueryBatchIndexingActionableAdapter.performActions(DynamicQueryBatchIndexingActionableAdapter.java:50)
	at com.liferay.portal.search.internal.indexer.IndexerWriterImpl.reindex(IndexerWriterImpl.java:205)
	at com.liferay.portal.search.internal.indexer.DefaultIndexer.reindex(DefaultIndexer.java:272)
	at com.liferay.portal.search.internal.SearchEngineInitializer.reindex(SearchEngineInitializer.java:173)
	at com.liferay.portal.search.internal.SearchEngineInitializer$1.call(SearchEngineInitializer.java:131)
	at com.liferay.portal.search.internal.SearchEngineInitializer$1.call(SearchEngineInitializer.java:124)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.liferay.portal.kernel.exception.NoSuchClassNameException: No ClassName exists with the primary key 0
	at com.liferay.portal.service.persistence.impl.ClassNamePersistenceImpl.findByPrimaryKey(ClassNamePersistenceImpl.java:615)
	at com.liferay.portal.service.persistence.impl.ClassNamePersistenceImpl.findByPrimaryKey(ClassNamePersistenceImpl.java:633)
	at com.liferay.portal.service.base.ClassNameLocalServiceBaseImpl.getClassName(ClassNameLocalServiceBaseImpl.java:225)
	at sun.reflect.GeneratedMethodAccessor228.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.liferay.portal.spring.aop.AopMethodInvocationImpl.proceed(AopMethodInvocationImpl.java:50)
	at com.liferay.portal.spring.transaction.TransactionInterceptor.lambda$invoke$0(TransactionInterceptor.java:64)
	at com.liferay.portal.spring.transaction.DefaultTransactionExecutor._execute(DefaultTransactionExecutor.java:128)
	at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:51)
	at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:62)
	at com.liferay.portal.spring.aop.AopMethodInvocationImpl.proceed(AopMethodInvocationImpl.java:57)
	at com.liferay.portal.spring.aop.AopInvocationHandler.invoke(AopInvocationHandler.java:49)
	at com.sun.proxy.$Proxy82.getClassName(Unknown Source)
	at com.liferay.portal.kernel.service.ClassNameLocalServiceUtil.getClassName(ClassNameLocalServiceUtil.java:233)
	at com.liferay.portal.util.PortalImpl.getClassName(PortalImpl.java:1587)
	... 18 more