I am currently working on a Spring Roo project and I want the exceptions thrown by Hibernate to be converted to Spring Exceptions. E.g. I want the Hibernate exception ConstraintViolationException to be converted to Spring's DataIntegrityViolationException.
I have done this in Spring projects previously by adding in the following code to my Spring config:
<!-- Translates Hibernate exceptions to Spring Data Access Exceptions -->
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
However in Roo this does not work. Can anybody tell me how I can get this working and why it doesn't work in Roo?
You must setup the persistence layer as JPA Repository in order Roo configures your project to use Spring Data.
http://docs.spring.io/spring-roo/reference/html/base-layers.html#d4e1962
Related
I just want to know the flow that how spring and hibernate work?
When Hibernate load and the execution?
I know about the Spring flow but confuse about how spring and hibernate work together?
Hello fellow developers,
i created a library using the Spring boot framework.
This library is creating a dynamic database connection using #Beans where i create a "data" Bean which holds the unlimited Datasource beans provided by a Postgresql db. At the end i wanted to have a dynamic db connection which could be triggered from outside to change the db i want to connect to. The information of the different databases where stored as mentioned inside of a postgres. This is loaded at the application start into this bean. My Problem is, that i'm not able to switch between the different Datasource beans. Spring boot is creating them, but it seems like it's not possible to change the bean started at runtime of the application which only holds one of the unlimited Datasources... So also after a retriggering of the creation of the original bean it still uses the old datasource.
Is there a way to use the beans from spring boot and change them on runtime?
Regards,
Andreas
I believe you are asking for DB multitenancy support where tenants information is stored in a Postgres DB.
Configuring the persistent layer for multi-tenancy support involves configuring:
Hibernate, JPA and Datasources properties
Datasources beans
Entity manager factory bean
Transaction manager bean
Spring Data JPA and annotation-driven transactions
I recently blog about Multi-tenant applications using Spring Boot, JPA, Hibernate and Postgres and although the tenants data is stored in a yml "properties" file, it shouldn't be difficult to convert it to read tenant data from a DB. I think it would be a starting point for what you would like to accomplish.
I have a spring boot project. I have a form where I bind an entity property using its id(Long). Like so,
<input name="entityProperty" value="1" ... />
It binds successfully when submitted (there's already an existing entity with id=1).
However, I export this project via jar file and use it in another Spring MVC project (not Spring boot). Now, I'm getting an error when binding this same scenario: backingObject.entityProperty is null.
It's similar to this question. It's suggested there that I have to create a conversion service, from Long to Type of my entity.
Do I have to do that solution also? Why didn't I have to provide that in my spring boot project? What's the default configuration for spring boot?
I fix this by adding a custom property editor,
public class BaseEntityEditor extends PropertyEditorSupport {}
However, it is still unclear to me why it works by default in my Spring Boot application.
I am looking at Spring documentation to learn Spring integration with Hibernate using annotation based spring configuration.
The documentation link is here.
Now the docs tell about how to configure Spring with Hibernate using xml files and there is no where mentioned how to use annotations for integrating Spring and Hibernate.
Please help me where can I find the explanation on Spring with Hibernate integration using annotations.
You can find the required annotations here - Annotations used for configuring DAO or Repository classes
Here is a good example for using Spring with Hibernate - Spring Hibernate Integration Using Annotations
http://examples.javacodegeeks.com/enterprise-java/hibernate/hibernate-jpa-dao-example/
I'm not sure if I should downvote you - you could easily find it on your own.
Ok, maybe it is not exactly Spring + Hibernate, but it really does not matter.
I have configured my application context as stated in the spring documentation to enable Exception Translation from jpa exceptions to spring DataAccessException. Should I also provide the implementation of PersistenceExceptionTranslator? If so, can anyone give me an example of how this is done?
I do it only by putting the #Repository annotation on my DAO or Manager class that uses the EntityManager.
Make sure that you enabled component scanning:
<context:component-scan base-package="org.example"/>
You can enable exception translation as well as repository scan by using following xml configuration
<jpa:repositories base-package="com.nagarro.ncpp.backend.repository" />