JDNI Datasource

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JDNI Datasource

https://www.baeldung.com/spring-persistence-jpa-jndi-datasource

The Java Naming and Directory Interface (JNDI) is a Java API for a directory service that allows Java software clients to discover and look up data and resources (in the form of Java objects) via a name

we're using a JNDI datasource, we won't define it in our application, we'll define it in our application container.

eg tomcat:

*<tomcat_home>/conf/server.xml, inside the element.

Postgresql

<Resource name="jdbc/BaeldungDatabase" 
	  auth="Container"
	  type="javax.sql.DataSource" 
	  driverClassName="org.postgresql.Driver"
	  url="jdbc:postgresql://localhost:5432/postgres"
	  username="baeldung" 
	  password="pass1234" 
	  maxTotal="20" 
	  maxIdle="10" 
	  maxWaitMillis="-1"/>

Notes; place the corresponding jar in /lib/ (in this case, PostgreSQL's JDBC jar

Also define a ResourceLink inside the element in */conf/context**.xml,* which would look like:

<ResourceLink 
  name="jdbc/BaeldungDatabase" 
  global="jdbc/BaeldungDatabase" 
  type="javax.sql.DataSource"/>

use in app

@Configuration
	@EnableTransactionManagement
	@PropertySource("classpath:persistence-jndi.properties")
	@ComponentScan("com.baeldung.hibernate.cache")
	@EnableJpaRepositories(basePackages = "com.baeldung.hibernate.cache.dao")
	public class PersistenceJNDIConfig {
	 
	    @Autowired
	    private Environment env;
	 
	    @Bean
	    public LocalContainerEntityManagerFactoryBean entityManagerFactory() 
	      throws NamingException {
	        LocalContainerEntityManagerFactoryBean em 
	          = new LocalContainerEntityManagerFactoryBean();
	        em.setDataSource(dataSource());
	        
	        // rest of entity manager configuration
	        return em;
	    }
	 
	    @Bean
	    public DataSource dataSource() throws NamingException {
	        return (DataSource) new JndiTemplate().lookup(env.getProperty("jdbc.url"));
	    }
	 
	    @Bean
	    public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
	        JpaTransactionManager transactionManager = new JpaTransactionManager();
	        transactionManager.setEntityManagerFactory(emf);
	        return transactionManager;
	    }
	 
	    // rest of persistence configuration
	}

tomcat jndi: https://tomcat.apache.org/tomcat-8.0-doc/jndi-datasource-examples-howto.html