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    <p>So, <code>spring-data</code> does some extra magic that helps with complex queries. It is strange at first and you totally skip it in the docs but it is really powerful and useful.</p> <p>It involves creating a custom <code>Repository</code> and a custom `RepositoryImpl' and telling Spring where to find it. Here is an example:</p> <p>Configuration class - <s>point to your still-needed xml config</s> with annotation pointing to your repositories package (it looks for <code>*Impl</code> classes automatically now):</p> <pre><code>@Configuration @EnableJpaRepositories(basePackages = {"com.examples.repositories"}) @EnableTransactionManagement public class MyConfiguration { } </code></pre> <p><s>jpa-repositories.xml - tell <code>Spring</code> where to find your repositories. Also tell <code>Spring</code> to look for custom repositories with the <code>CustomImpl</code> file name:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"&gt; &lt;jpa:repositories base-package="com.example.repositories" repository-impl-postfix="CustomImpl" /&gt; &lt;/beans&gt; </code></pre> <p></s></p> <p><code>MyObjectRepository</code> - this is where you can put annotated and unannotated query methods. Note how this repository interface extends the <code>Custom</code> one:</p> <pre><code>@Transactional public interface MyObjectRepository extends JpaRepository&lt;MyObject, Integer&gt;, MyObjectRepositoryCustom { List&lt;MyObject&gt; findByName(String name); @Query("select * from my_object where name = ?0 or middle_name = ?0") List&lt;MyObject&gt; findByFirstNameOrMiddleName(String name); } </code></pre> <p><code>MyObjectRepositoryCustom</code> - repository methods that are more complex and cannot be handled with a simple query or an annotation:</p> <pre><code>public interface MyObjectRepositoryCustom { List&lt;MyObject&gt; findByNameWithWeirdOrdering(String name); } </code></pre> <p><code>MyObjectRepositoryCustomImpl</code> - where you actually implement those methods with an autowired <code>EntityManager</code>:</p> <pre><code>public class MyObjectRepositoryCustomImpl implements MyObjectRepositoryCustom { @Autowired private EntityManager entityManager; public final List&lt;MyObject&gt; findByNameWithWeirdOrdering(String name) { Query query = query(where("name").is(name)); query.sort().on("whatever", Order.ASC); return entityManager.find(query, MyObject.class); } } </code></pre> <p>Amazingly, this all comes together and methods from both interfaces (and the CRUD interface, you implement) all show up when you do:</p> <pre><code>myObjectRepository. </code></pre> <p>You will see:</p> <pre><code>myObjectRepository.save() myObjectRepository.findAll() myObjectRepository.findByName() myObjectRepository.findByFirstNameOrMiddleName() myObjectRepository.findByNameWithWeirdOrdering() </code></pre> <p>It really does work. And you get one interface for querying. <code>spring-data</code> really is ready for a large application. And the more queries you can push into simple or annotation only the better off you are.</p> <p>All of this is documented at the <a href="http://docs.spring.io/spring-data/data-jpa/docs/1.4.x/reference/htmlsingle/#repositories.custom-implementations" rel="nofollow noreferrer">Spring Data Jpa site</a>.</p> <p>Good luck.</p>
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    1. POHow does Spring Data JPA differ from Hibernate for large projects?
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    1. USAshish Ratan
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    1. COThis is actually what I tried, and it works to some extent. The problem I had is what if you want to override save()? For example, imagine you are saving a blog, and you want to process/save the tags associated with it in the save() method since putting it in a service doesn't make the most sense. This is easy to do with raw Hibernate, but I don't see a good way to do with Spring JPA. I'm going to mark your answer as correct though because it's correct. That's basically what you can do with Spring Data JPA. I think I'll stick with Hibernate though. This answer will definitely help others.
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    2. COYou can implement your own `JpaRepository` -> `MyJpaRepository`. You have to also create a `MyJpaRepositoryFactoryBean` but if you set it all up correctly, you can override the .save() method. Here is the Spring Data JPA Docs: http://static.springsource.org/spring-data/data-jpa/docs/current/reference/html/#repositories.custom-behaviour-for-all-repositories Don't give up just yet!
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