A problem with the object-relational mapping causes aMappingExceptionto be thrown: public void whenQueryExecutedWithUnmappedEntity_thenMappingException() { thrown.expect(isA(MappingException.class)); thrown.expectMessage("Unable to locate persister: com.baeldung.hibernate.exception.ProductNotMapped"); Product...
If there are a lot more statements than you expected, you most likely have the most common performance problem, the n+1 select issue. You can find it in nearly all applications, and it might create huge performance issues on a bigger database. I explain this issue in more details in the...
In Hibernate, the DataIntegrityViolationException is often caused by issues with entity persistence. This can occur if an entity is persisted with a problem, such as having a null property that is defined with a not-null constraint or if an association of the entity references an unsaved, tran...
The demo (was generated using Spring Initializer and this doc: https://www.baeldung.com/spring-data-jpa-query: demo_spring-data-2.6.3_hibernate_5.6.7..zip. It can be imported as Maven project in Eclipse and IntelliJ.Note: I did try using CriteriaQuery as shown below and got no error ...
Written by:baeldung Reviewed by:Sam Millington Persistence Hibernate 1. Overview Working with Hibernate, we might have encountered an error that says:org.hibernate.LazyInitializationException : could not initialize proxy – no Session. In this quick tutorial, we’ll take a closer look at the root...