hibernate/hibernate-orm · error · LazyInitializationException

Could not initialize proxy [{}#{}] - the owning session was

Error message

Could not initialize proxy [{}#{}] - the owning session was closed

What it means

Error "Could not initialize proxy [{}#{}] - the owning session was closed" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/proxy/AbstractLazyInitializer.java:182

		prepareForPossibleLoadingOutsideTransaction();
		session = null;
		readOnly = false;
		readOnlyBeforeAttachedToSession = null;
	}

	@Override
	public final void initialize() throws HibernateException {
		if ( !initialized ) {
			try {
				if ( allowLoadOutsideTransaction ) {
					permissiveInitialization();
				}
				else if ( session == null ) {
					throw new LazyInitializationException( "Could not initialize proxy ["
							+ entityName + "#" + id + "] - no session" );
				}
				else if ( !session.isOpenOrWaitingForAutoClose() ) {
					throw new LazyInitializationException( "Could not initialize proxy ["
							+ entityName + "#" + id + "] - the owning session was closed" );
				}
				else if ( !session.isConnected() ) {
					throw new LazyInitializationException( "Could not initialize proxy ["
							+ entityName + "#" + id + "] - the owning session is disconnected" );
				}
				else {
					target = immediateLoad( session );
					initialized = true;
					checkTargetState( session );
				}
			}
			finally {
				if ( session != null && !session.isTransactionInProgress() ) {
					session.getJdbcCoordinator().afterTransaction();
				}
			}
		}

View on GitHub (pinned to fad1729dce)

Solutions

1. Initialize the proxy before closing the owning Session.
2. Reattach the entity to a new Session via merge/load before accessing lazy state.

When it happens

Trigger: A lazy proxy is accessed outside the lifecycle of its owning Hibernate Session.

Common situations: LazyInitializationException-style failures when rendering entities after the transaction/Session closed, common in web views and serialization.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/87d3aa7953c4c94f. Report an issue: GitHub.