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Tag Archives: JPA

JPA 2.1 Type Converter – The better way to persist enums

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Persisting enums with JPA 2.0 is possible, but there is no nice way to do it. Using the @Enumerated annotation, you can use EnumType.ORDINAL or EnumType.STRING to map the enum value to its database representation. But both options have some drawbacks, that we will discuss in the first part of this article. In the second part, I will show you ...

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SpringMVC4 + Spring Data JPA + SpringSecurity configuration using JavaConfig

spring-interview-questions-answers

In this article we will see how to configure and integrate SpringMVC4, Spring Data JPA with Hibernate and SpringSecurity using JavaConfig. 1. First let’s configure all the necessary dependencies in pom.xml                 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.sivalabs</groupId> <artifactId>spring-javaconfig</artifactId> <version>1.0</version> <packaging>war</packaging> <name>SpringApp JavaConfig Demo</name> <properties> <java.version>1.7</java.version> <junit.version>4.11</junit.version> <slf4j.version>1.7.5</slf4j.version> <logback.version>1.0.13</logback.version> <spring.version>4.0.0.RELEASE</spring.version> <spring-data-jpa.version>1.4.1.RELEASE</spring-data-jpa.version> <spring-security.version>3.2.0.RELEASE</spring-security.version> ...

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Project Student: JPA Criteria Queries

java-interview-questions-answers

This is part of Project Student. Other posts are Webservice Client With Jersey, Webservice Server with Jersey, Business Layer, Persistence with Spring Data, Sharding Integration Test Data and Webservice Integration. We’ve covered basic CRUD operations but that doesn’t take us very far. Spring Data makes it easy to include basic searches but it’s important to have other standard options. One ...

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Primefaces DataTable Lazy Loading with pagination, filtering and sorting using JPA Criteria, @ViewScoped

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Primefaces datatable lazy pagination works, but I was really frustrated after searching for a full example using Criteria in the web. So I’ve mixed solutions from http://stackoverflow.com/questions/13972193/how-to-query-data-for-primefaces-datatable-with-lazy-loading-and-pagination http://www.primefaces.org/showcase/ui/datatableLazy.jsf http://www.javacodegeeks.com/2012/04/lazy-jsf-primefaces-datatable.html To put all together in a complete example using:     Primefaces 4.0 TomEE 1.6.0+ Criteria JPA With: Filtering Sorting Pagination Using @ViewScoped Managed Beans So let’s go: xhtml snippet <?xml ...

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Java: Using the specification pattern with JPA

java-interview-questions-answers

This article is an introduction to using the specification pattern in Java. We also will see how we can combine classic specifications with JPA Criteria queries to retrieve objects from a relational database. Within this post we will use the following Poll class as an example entity for creating specifications. It represents a poll that has a start and end ...

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JOOQ Facts: From JPA Annotations to JOOQ Table Mappings

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JOOQ is a neat framework, and it addresses a long issue I’ve had with advanced dynamic filtered queries. While Hibernate and JPA come with a useful Criteria API, which I’ve been using for quite some time, there are understandable limits to what you can do with those. For instance, you cannot go beyond simple SQL operations (e.g JOINS, NESTED SLECTS, ...

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Efficiently delete data with JPA and Hibernate

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You may come to the situation where you have to perform a bulk deletion on a huge amount of datasets stored in a relational database. If you use JPA with Hibernate as underlying OR mapper, you might try to call the remove() method of the EntityManager in a way like the following:               public ...

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Spring-injected Beans in JPA EntityListeners

spring-interview-questions-answers

In Database Encryption Using JPA Listeners I discussed transparent encryption using a JPA EntityListener. This approach was transparent in the sense that the JPA Entity was (nearly) entirely unaware that encryption was occurring and the JPA EntityListener itself was unaware of the details. There was one big problem. EJB3 can inject resources into an EntityListener. Spring cannot. (N.B., I am ...

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