{"id":11295,"date":"2013-04-16T19:00:38","date_gmt":"2013-04-16T16:00:38","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=11295"},"modified":"2013-04-16T06:43:07","modified_gmt":"2013-04-16T03:43:07","slug":"spring-jparepository-example-in-memory","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/04\/spring-jparepository-example-in-memory.html","title":{"rendered":"Spring JpaRepository Example (In-Memory)"},"content":{"rendered":"<p>This post describes a simple Spring JpaRepository example using an in memory HSQL database. The code example is available from <a href=\"https:\/\/github.com\/JVerstry\/Web-Related-Examples\" target=\"_blank\">GitHub<\/a> in the Spring-JpaRepository directory. It is based on the <a href=\"http:\/\/technotes.tostaky.biz\/2012\/08\/spring-mvc-with-annotations-example.html\">Spring-MVC-With-Annotations<\/a> example and information available <a href=\"http:\/\/blog.springsource.com\/2011\/02\/10\/getting-started-with-spring-data-jpa\/\" target=\"_blank\">here<\/a>.<\/p>\n<h2>JPA Repository<\/h2>\n<p>We implement a dummy bean for this example:<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<\/p>\n<pre class=\" brush:java\">@Entity\r\n@AutoProperty\r\npublic class SomeItem {\r\n\r\n    @Id\r\n    @GeneratedValue(strategy=GenerationType.AUTO)\r\n    private long Id;\r\n\r\n    private String someText;\r\n\r\n    \/* ...Setters &amp; Getters *\/\r\n\r\n}<\/pre>\n<p>and the corresponding <a href=\"http:\/\/static.springsource.org\/spring-data\/jpa\/docs\/dev\/api\/org\/springframework\/data\/jpa\/repository\/JpaRepository.html\" target=\"_blank\">JpaRepository<\/a>:<\/p>\n<pre class=\" brush:java\">@Transactional\r\npublic interface SomeItemRepository\r\n        extends JpaRepository&lt;SomeItem, Long&gt; {\r\n\r\n}<\/pre>\n<h2>Service &amp; Controller<\/h2>\n<p>Next, we implement a service where our repository will be injected. We also populate the repository with dummy data:<\/p>\n<pre class=\" brush:java\">@Service\r\n@Repository\r\npublic class SomeItemService {\r\n\r\n    @Autowired\r\n    private SomeItemRepository someItemRepository;\r\n\r\n    @PostConstruct\r\n    @Transactional\r\n    public void populate() {\r\n\r\n        SomeItem si = new SomeItem();\r\n        si.setSomeText(\"aaa\");\r\n        someItemRepository.saveAndFlush(si);\r\n\r\n        si = new SomeItem();\r\n        si.setSomeText(\"bbb\");\r\n        someItemRepository.saveAndFlush(si);\r\n\r\n        si = new SomeItem();\r\n        si.setSomeText(\"ccc\");\r\n        someItemRepository.saveAndFlush(si);\r\n\r\n    }\r\n\r\n    @Transactional(readOnly=true)\r\n    public List&lt;SomeItem&gt; getAll() {\r\n\r\n        return someItemRepository.findAll();\r\n\r\n    }\r\n\r\n    @SuppressWarnings(\"AssignmentToMethodParameter\")\r\n    @Transactional\r\n    public SomeItem saveAndFlush(SomeItem si) {\r\n\r\n        if ( si != null ) {\r\n            si = someItemRepository.saveAndFlush(si);\r\n        }\r\n\r\n        return si;\r\n\r\n    }\r\n\r\n    @Transactional\r\n    public void delete(long id) {\r\n\r\n        someItemRepository.delete(id);\r\n\r\n    }\r\n\r\n}<\/pre>\n<p>and a controller:<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\" brush:java\">@Controller\r\npublic class MyController {\r\n\r\n    @Autowired\r\n    private SomeItemService someItemService;\r\n\r\n    @RequestMapping(value = \"\/\")\r\n    public ModelAndView index() {\r\n\r\n        ModelAndView result = new ModelAndView(\"index\");\r\n        result.addObject(\"items\", this.someItemService.getAll());\r\n\r\n        return result;\r\n\r\n    }\r\n\r\n    @RequestMapping(value = \"\/delete\/{id}\")\r\n    public String delete(\r\n        @PathVariable(value=\"id\") String id) {\r\n\r\n        this.someItemService.delete(Long.parseLong(id));\r\n\r\n        return \"redirect:\/\";\r\n\r\n    }\r\n\r\n    @RequestMapping(value = \"\/create\")\r\n    @SuppressWarnings(\"AssignmentToMethodParameter\")\r\n    public String add() {\r\n\r\n        SomeItem si = new SomeItem();\r\n        si.setSomeText(\"Time is: \" + System.currentTimeMillis());\r\n\r\n        this.someItemService.saveAndFlush(si);\r\n\r\n        return \"redirect:\/\";\r\n\r\n    }\r\n\r\n}<\/pre>\n<h2>JPA Configuration<\/h2>\n<p>On top of creating an entity manager based on an in-memeory instance of HSQL database, we enable JPA repositories with the<br \/>\n@EnableJpaRepositories annotation:<\/p>\n<pre class=\" brush:java\">@Configuration\r\n@EnableJpaRepositories(basePackages={\"com.jverstry\"})\r\n@EnableTransactionManagement\r\npublic class JpaConfig implements DisposableBean {\r\n\r\n    private EmbeddedDatabase ed;\r\n\r\n    @Bean(name=\"hsqlInMemory\")\r\n    public EmbeddedDatabase hsqlInMemory() {\r\n\r\n        if ( this.ed == null ) {\r\n            EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();\r\n            this.ed = builder.setType(EmbeddedDatabaseType.HSQL).build();\r\n        }\r\n\r\n        return this.ed;\r\n\r\n    }\r\n\r\n    @Bean\r\n    public LocalContainerEntityManagerFactoryBean entityManagerFactory(){\r\n\r\n        LocalContainerEntityManagerFactoryBean lcemfb\r\n            = new LocalContainerEntityManagerFactoryBean();\r\n\r\n        lcemfb.setDataSource(this.hsqlInMemory());\r\n        lcemfb.setPackagesToScan(new String[] {\"com.jverstry\"});\r\n\r\n        lcemfb.setPersistenceUnitName(\"MyPU\");\r\n\r\n        HibernateJpaVendorAdapter va = new HibernateJpaVendorAdapter();\r\n        lcemfb.setJpaVendorAdapter(va);\r\n\r\n        Properties ps = new Properties();\r\n        ps.put(\"hibernate.dialect\", \"org.hibernate.dialect.HSQLDialect\");\r\n        ps.put(\"hibernate.hbm2ddl.auto\", \"create\");\r\n        lcemfb.setJpaProperties(ps);\r\n\r\n        lcemfb.afterPropertiesSet();\r\n\r\n        return lcemfb;\r\n\r\n    }\r\n\r\n    @Bean\r\n    public PlatformTransactionManager transactionManager(){\r\n\r\n        JpaTransactionManager tm = new JpaTransactionManager();\r\n\r\n        tm.setEntityManagerFactory(\r\n            this.entityManagerFactory().getObject() );\r\n\r\n        return tm;\r\n\r\n    }\r\n\r\n    @Bean\r\n    public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){\r\n        return new PersistenceExceptionTranslationPostProcessor();\r\n    }\r\n\r\n    @Override\r\n    public void destroy() {\r\n\r\n        if ( this.ed != null ) {\r\n            this.ed.shutdown();\r\n        }\r\n\r\n    }\r\n\r\n}<\/pre>\n<h2>The JSP Page<\/h2>\n<p>We create a simple page to list existing items with a delete link, and the possibility to create new items:<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/04\/JpaRepositories.jpg\"><img decoding=\"async\" class=\"aligncenter\" style=\"border: 0px none;\" alt=\"\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/04\/JpaRepositories.jpg\" width=\"444\" height=\"258\" border=\"0\" \/><\/a><\/p>\n<h2>\u00a0Running The Example<\/h2>\n<p>One can run it using the maven tomcat:run goal. Then, browse: http:\/\/localhost:9191\/spring-jparepository\/<\/p>\n<p>&nbsp;<\/p>\n<div style=\"border: 1px solid #D8D8D8; background: #FAFAFA; width: 100%; padding-left: 5px;\"><b><i>Reference: <\/i><\/b><a href=\"http:\/\/technotes.tostaky.biz\/2013\/03\/spring-jparepository-example-in-memory.html\">Spring JpaRepository Example (In-Memory)<\/a> from our <a href=\"http:\/\/www.javacodegeeks.com\/jcg\">JCG partner<\/a> Jerome Versrynge at the <a href=\"http:\/\/technotes.tostaky.biz\/\">Technical Notes<\/a> blog.<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This post describes a simple Spring JpaRepository example using an in memory HSQL database. The code example is available from GitHub in the Spring-JpaRepository directory. It is based on the Spring-MVC-With-Annotations example and information available here. JPA Repository We implement a dummy bean for this example: &nbsp; &nbsp; &nbsp; @Entity @AutoProperty public class SomeItem { &hellip;<\/p>\n","protected":false},"author":294,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[30],"class_list":["post-11295","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spring JpaRepository Example (In-Memory)<\/title>\n<meta name=\"description\" content=\"This post describes a simple Spring JpaRepository example using an in memory HSQL database. 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