First off, some clarifications to KLE‘s answer: Unconstrained (nullable) one-to-one association is the only one that can not be proxied without bytecode instrumentation. The reason for this is that owner entity MUST know whether association property should contain a proxy object or NULL and it can’t determine that by looking at its base table’s columns … Read more
Either way will add an entity to a PersistenceContext, the difference is in what you do with the entity afterwards. Persist takes an entity instance, adds it to the context and makes that instance managed (i.e. future updates to the entity will be tracked). Merge returns the managed instance that the state was merged with. … Read more
The annotation @JoinColumn indicates that this entity is the owner of the relationship (that is: the corresponding table has a column with a foreign key to the referenced table), whereas the attribute mappedBy indicates that the entity in this side is the inverse of the relationship, and the owner resides in the “other” entity. This … Read more
Is this the correct way of doing things? Apart from performing business logic the inefficient way in a managed bean getter method, and using a too broad managed bean scope, it looks okay. If you move the service call from the getter method to a @PostConstruct method and use either @RequestScoped or @ViewScoped instead of … Read more
Please use this InterviewStatus findByInterviewId(Interviews interviewId); where interviewId is gotten by running Interviews findById(Long id). Due to the datatype conflict, it is ok that you pass in as parameter the expected datatype. so it is expecting Interviews not Integer, but you have integer. in this case, you get Interviews using the integer then pass the … Read more
As we can see here you have closed connection to DB in that time when you try to setString do. The way It is possible When you don’t create any connection to DB When you create but don’t open any connection to DB When you create and, even open, but, close connection before tries to … Read more
You could serialize / Deserialize the JSON as String. Use JPA Converters, which shall automatically convert the same. Suggest to use Jackson JAR for the same.