HTTP Status 405 – Request method ‘POST’ not supported (Spring MVC)
I found the problem that was causing the HTTP error. In the setFalse() function that is triggered by the Save button my code was trying … Read more
hibernate
What are the possible values of the Hibernate hbm2ddl.auto configuration and what do they do
From the community documentation: hibernate.hbm2ddl.auto Automatically validates or exports schema DDL to the database when the SessionFactory is created. With create-drop, the database schema … Read more
PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
This is a typical bidirectional consistency problem. It is well discussed in this link as well as this link. As per the articles … Read more
How to fix the Hibernate “object references an unsaved transient instance – save the transient instance before flushing” error
You should include cascade=”all” (if using xml) or cascade=CascadeType.ALL (if using annotations) on your collection mapping. This happens because you have a collection in your entity, and … Read more
Hibernate Error: a different object with the same identifier value was already associated with the session
Most probably its because the B objects are not referring to the same Java C object instance. They are referring to the same … Read more
How to solve the “failed to lazily initialize a collection of role” Hibernate exception
If you know that you’ll want to see all Comments every time you retrieve a Topic then change your field mapping for comments to: @OneToMany(fetch = FetchType.EAGER, mappedBy … Read more
hibernate properties not found
I guess the problem is with the code for configuration you mentioned for .hbm.xml may not be working in Tomcat. I think it needs AnnotationConfiguration object. I … Read more
What kind of Java type is “[B”?
That my friend is an array of bytes. In JNI, [B is used to describe an array ([) of bytes (B). An array … Read more
Hibernate – Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
Hibernate – Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
What’s the difference between JPA and Hibernate?
I understand that JPA 2 is a specification and Hibernate is a tool for ORM. Also, I understand that Hibernate has more features … Read more