Johannes Edmeier ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5d9b11b... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYTI1NzExOTFi... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16267?atlOrigin=eyJpIjoiYTI1Nz... ) HHH-16267 ( https://hibernate.atlassian.net/browse/HHH-16267?atlOrigin=eyJpIjoiYTI1Nz... ) ConcurrentModificationException: when initializing lazy one-to-many-collection ( https://hibernate.atlassian.net/browse/HHH-16267?atlOrigin=eyJpIjoiYTI1Nz... ) Change By: Johannes Edmeier ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5d9b11b... ) We experienced a CME when initilizing a lazy one-to-many. {noformat}java.util.ConcurrentModificationException: null at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1013) at java.base/java.util.ArrayList$Itr.next(ArrayList.java:967) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitAnsiCaseSearchedExpression(AbstractSqlAstTranslator.java:4858) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitCaseSearchedExpression(AbstractSqlAstTranslator.java:4849) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitCaseSearchedExpression(AbstractSqlAstTranslator.java:4841) at org.hibernate.sql.ast.tree.expression.CaseSearchedExpression.accept(CaseSearchedExpression.java:99) at org.hibernate.metamodel.mapping.internal.CaseStatementDiscriminatorMappingImpl$1.renderToSql(CaseStatementDiscriminatorMappingImpl.java:168) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSelfRenderingExpression(AbstractSqlAstTranslator.java:5072) at org.hibernate.sql.ast.tree.expression.SelfRenderingExpression.accept(SelfRenderingExpression.java:20) at org.hibernate.dialect.PostgreSQLSqlAstTranslator.renderExpressionAsClauseItem(PostgreSQLSqlAstTranslator.java:38) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.renderSelectExpression(AbstractSqlAstTranslator.java:3616) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSqlSelectExpression(AbstractSqlAstTranslator.java:3585) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSqlSelection(AbstractSqlAstTranslator.java:3567) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSqlSelections(AbstractSqlAstTranslator.java:3217) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSelectClause(AbstractSqlAstTranslator.java:3135) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitQuerySpec(AbstractSqlAstTranslator.java:1603) at org.hibernate.dialect.PostgreSQLSqlAstTranslator.visitQuerySpec(PostgreSQLSqlAstTranslator.java:103) at org.hibernate.sql.ast.tree.select.QuerySpec.accept(QuerySpec.java:129) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.visitSelectStatement(AbstractSqlAstTranslator.java:837) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.translateSelect(AbstractSqlAstTranslator.java:707) at org.hibernate.sql.ast.spi.AbstractSqlAstTranslator.translate(AbstractSqlAstTranslator.java:645) at org.hibernate.loader.ast.internal.CollectionLoaderSingleKey.load(CollectionLoaderSingleKey.java:112) at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:789) at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:75) at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1710) at org.hibernate.collection.spi.AbstractPersistentCollection.lambda$initialize$3(AbstractPersistentCollection.java:617) at org.hibernate.collection.spi.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:265) at org.hibernate.collection.spi.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:615) at org.hibernate.collection.spi.AbstractPersistentCollection.read(AbstractPersistentCollection.java:136) at org.hibernate.collection.spi.PersistentList.iterator(PersistentList.java:168) at java.base/java.util.Spliterators$IteratorSpliterator.estimateSize(Spliterators.java:1865) at java.base/java.util.Spliterator.getExactSizeIfKnown(Spliterator.java:414) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:508) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ... {noformat} ( https://hibernate.atlassian.net/browse/HHH-16267#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16267#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! 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