hibernate/hibernate-orm · error · SemanticException

Oracle array constructor emulation requires knowledge about

Error message

Oracle array constructor emulation requires knowledge about the return type, but resolved return type could not be determined

What it means

Error "Oracle array constructor emulation requires knowledge about the return type, but resolved return type could not be determined" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/dialect/function/array/OracleArrayConstructorFunction.java:29

import org.hibernate.sql.ast.SqlAstTranslator;
import org.hibernate.sql.ast.spi.SqlAppender;
import org.hibernate.sql.ast.tree.SqlAstNode;
import org.hibernate.type.BasicPluralType;

public class OracleArrayConstructorFunction extends ArrayConstructorFunction {

	public OracleArrayConstructorFunction(boolean list) {
		super( list, false );
	}

	@Override
	public void render(
			SqlAppender sqlAppender,
			List<? extends SqlAstNode> sqlAstArguments,
			ReturnableType<?> returnType,
			SqlAstTranslator<?> walker) {
		if ( returnType == null ) {
			throw new SemanticException(
					"Oracle array constructor emulation requires knowledge about the return type, but resolved return type could not be determined"
			);
		}
		if ( !(returnType instanceof BasicPluralType<?, ?> pluralType) ) {
			throw new SemanticException(
					"Oracle array constructor emulation requires a basic plural return type, but resolved return type was: " + returnType
			);
		}
		final String arrayTypeName = DdlTypeHelper.getCastTypeName(
				pluralType,
				walker.getSessionFactory().getTypeConfiguration()
		);
		sqlAppender.appendSql( arrayTypeName );
		final int size = sqlAstArguments.size();
		if ( size == 0 ) {
			sqlAppender.append( '(' );
		}
		else {

View on GitHub (pinned to fad1729dce)

Solutions

1. Provide an explicit return type for the array constructor.

When it happens

Trigger: Triggered when the application calls a Hibernate dialect feature that the configured database dialect cannot provide: Oracle array constructor emulation requires knowledge about the return type, but resolved return type could not be determined.

Common situations: 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: Oracle array constructor emulation requires knowledge about the return type, but resolved return type could not be determined.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/7acf2b2bff34e47a. Report an issue: GitHub.