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public class MultiTenantJpaTransactionManager extends JpaTransactionManager {
private CurrentTenantResolver tenantResolver;
protected void doBegin(final Object transaction, final TransactionDefinition definition) {
super.doBegin(transaction, definition);
final EntityManagerHolder emHolder = (EntityManagerHolder) TransactionSynchronizationManager.getResource(getEntityManagerFactory());
final EntityManager em = emHolder.getEntityManager();
final Serializable tenantId = tenantResolver.getCurrentTenantId();
if (tenantId != null) {
em.setProperty("eclipselink.tenant-id", tenantId);
} else {
// some error handling here
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