Spring JPA: no transaction is in progress

Question

I\'m having problems persisting entities in my Spring application. Just doing em.merge() finishes without errors but does not update the database, and trying

Answer 1

Just like @Neil Stockton mentioned, some EntityManager functions require a Transaction to exist. see the doc

Here is the doc about flush function:

void flush() Synchronize the persistence context to the underlying database. Throws: TransactionRequiredException - if there is no transaction or if the entity manager has not been joined to the current transaction PersistenceException - if the flush fails

The same goes for Merge function as well:

T merge(T entity) Merge the state of the given entity into the current persistence context. Parameters: entity - entity instance Returns: the managed instance that the state was merged to Throws: IllegalArgumentException - if instance is not an entity or is a removed entity TransactionRequiredException - if there is no transaction when invoked on a container-managed entity manager of that is of type PersistenceContextType.TRANSACTION

So basically what you want is to create new transaction or to use an exists one. Since you are using @EnableTransactionManagement annotation you can just annotate your method in order to do so

@Transactional(propagation=Propagation.REQUIRED)
public Project save(Project project) {
        project = em.merge(project);
        em.flush();
        return project;
    }

More about Spring Transactions can be found at the spring docs. More the transactions in java can be found at ibm which is highly recommended.