{"record":{"id":"cb552cf888663e36","repo":"hibernate/hibernate-orm","slug":"dialect-does-not-support-aggregatecomponentcustom","errorCode":null,"errorMessage":"\"Dialect does not support aggregateComponentCustomReadExpression: \" + getClass().getName()","messagePattern":"\"Dialect does not support aggregateComponentCustomReadExpression: \" \\+ getClass\\(\\)\\.getName\\(\\)","errorType":"exception","errorClass":"UnsupportedOperationException","httpStatus":null,"severity":"error","filePath":"hibernate-core/src/main/java/org/hibernate/dialect/aggregate/AggregateSupportImpl.java","lineNumber":37,"sourceCode":"import static org.hibernate.type.SqlTypes.JSON;\nimport static org.hibernate.type.SqlTypes.JSON_ARRAY;\nimport static org.hibernate.type.SqlTypes.SQLXML;\nimport static org.hibernate.type.SqlTypes.XML_ARRAY;\n\npublic class AggregateSupportImpl implements AggregateSupport {\n\n\tpublic static final AggregateSupport INSTANCE = new AggregateSupportImpl();\n\n\t@Override\n\tpublic String aggregateComponentCustomReadExpression(\n\t\t\tString template,\n\t\t\tString placeholder,\n\t\t\tString aggregateParentReadExpression,\n\t\t\tString columnExpression,\n\t\t\tint aggregateColumnTypeCode,\n\t\t\tSqlTypedMapping column,\n\t\t\tTypeConfiguration typeConfiguration) {\n\t\tthrow new UnsupportedOperationException( \"Dialect does not support aggregateComponentCustomReadExpression: \" + getClass().getName() );\n\t}\n\n\t@Override\n\tpublic String aggregateComponentAssignmentExpression(\n\t\t\tString aggregateParentAssignmentExpression,\n\t\t\tString columnExpression,\n\t\t\tint aggregateColumnTypeCode,\n\t\t\tColumn column) {\n\t\tthrow new UnsupportedOperationException( \"Dialect does not support aggregateComponentAssignmentExpression: \" + getClass().getName() );\n\t}\n\n\t@Override\n\tpublic String aggregateCustomWriteExpression(\n\t\t\tAggregateColumn aggregateColumn,\n\t\t\tList<Column> aggregatedColumns) {\n\t\treturn null;\n\t}\n","sourceCodeStart":19,"sourceCodeEnd":55,"githubUrl":"https://github.com/hibernate/hibernate-orm/blob/fad1729dce015f908198d57a8d80274a30f905a5/hibernate-core/src/main/java/org/hibernate/dialect/aggregate/AggregateSupportImpl.java#L19-L55","documentation":"Error \"\"Dialect does not support aggregateComponentCustomReadExpression: \" + getClass().getName()\" thrown in hibernate/hibernate-orm.","triggerScenarios":"Triggered when the application calls a Hibernate dialect feature that the configured database dialect cannot provide: Dialect does not support aggregateComponentCustomReadExpression.","commonSituations":"Common when running against a database whose dialect lacks this capability, when a mapping or HQL/Criteria query requests unsupported functionality, or when the wrong dialect is configured for the database in use. Error: Dialect does not support aggregateComponentCustomReadExpression.","solutions":["Use a dialect with aggregate support (e.g. PostgreSQL for JSON/Struct).","Map the component as a plain embeddable instead of an aggregate type."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"fad1729dce015f908198d57a8d80274a30f905a5","analyzedAt":"2026-08-22T04:13:57.527Z","schemaVersion":2},"datasetVersion":"2026-08-22T09:17:25.309Z"}