How to use JNDI DataSource provided by Tomcat in Spring

Question

It is said that in the Spring javadoc article about DriverManagerDataSource class  that this class is very simple and that it is recommended     to use a JNDI DataSource provided by the container  Such a DataSource can be exposed as a DataSource bean in a Spring ApplicationContext via JndiObjectFactoryBean   The question is  how do I accomplish this   For example  if I wish to have DataSource bean to access my custom MySQL database  what would I require then  What should I write in the context configuration  etc

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Documentation  C 2 3 1  lt jee jndi-lookup  gt   simple   Example    lt jee jndi-lookup id  dataSource  jndi-name  jdbc MyDataSource   gt    You just need to find out what JNDI name your appserver has bound the datasource to  This is entirely server-specific  consult the docs on your server to find out how   Remember to declare the jee namespace at the top of your beans file  as described in C 2 3 The jee schema

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Another feature   instead of of server xml  you can add   Resource  tag in your application META-INF Context xml  according to tomcat docs  like this    lt Context gt   lt Resource name  jdbc DatabaseName  auth  Container  type  javax sql DataSource    username  dbUsername  password  dbPasswd    url  jdbc postgresql   localhost dbname    driverClassName  org postgresql Driver    initialSize  5  maxWait  5000    maxActive  120  maxIdle  5    validationQuery  select 1    poolPreparedStatements  true   gt   lt  Context gt

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I found this solution very helpful in a clean way to remove xml configuration entirely    Please check this db configuration using JNDI and spring framework  http   www unotions com design how-to-create-oracleothersql-db-configuration-using-spring-and-maven   By this article  it explain how easy to create a db confguration based on database jndi db test  configuration  once you are done with configuration then all the db repositories are loaded using this jndi  I did find useful  If  Pierre has issue with this then let me know  It s complete solution to write db configuration

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Assuming you have a  sampleDS  datasource definition inside your tomcat configuration  you can add following lines to your applicationContext xml to access the datasource using JNDI    lt jee jndi-lookup expected-type  javax sql DataSource  id  springBeanIdForSampleDS  jndi-name  sampleDS   gt    You have to define the namespace and schema location for jee prefix using   xmlns jee  http   www springframework org schema jee  xsi schemaLocation  http   www springframework org schema jee http   www springframework org schema jee spring-jee-3 0 xsd

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In your spring class  You can inject a bean annotated like as    Autowired  Qualifier  dbDataSource   private DataSource dataSource    and You add this in your context xml   lt beans bean id  dbDataSource  class  org springframework jndi JndiObjectFactoryBean  gt       lt beans property name  jndiName  value  java comp env jdbc MyLocalDB   gt   lt  beans bean gt    You can declare the JNDI resource in tomcat s server xml using    lt Resource name  jdbc TestDB     global  jdbc TestDB     auth  Container     type  javax sql DataSource     driverClassName  com mysql jdbc Driver     url  jdbc mysql   localhost 3306 TestDB     username  pankaj     password  pankaj123      maxActive  100     maxIdle  20     minIdle  5     maxWait  10000   gt    back to context xml de spring add this    lt ResourceLink name  jdbc MyLocalDB                  global  jdbc TestDB                  auth  Container                  type  javax sql DataSource    gt    if  like this exmple you are injecting connection to database  make sure that MySQL jar is present in the tomcat lib directory  otherwise tomcat will not be able to create the MySQL database connection pool

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If using Spring s XML schema based configuration  setup in the Spring context like this    lt beans xmlns  http   www springframework org schema beans    xmlns xsi  http   www w3 org 2001 XMLSchema-instance    xmlns jee  http   www springframework org schema jee  xsi schemaLocation       http   www springframework org schema beans http   www springframework org schema beans spring-beans xsd     http   www springframework org schema jee http   www springframework org schema jee spring-jee xsd  gt       lt jee jndi-lookup id  dbDataSource     jndi-name  jdbc DatabaseName     expected-type  javax sql DataSource    gt    Alternatively  setup using simple bean configuration like this    lt bean id  DatabaseName  class  org springframework jndi JndiObjectFactoryBean  gt       lt property name  jndiName  value  java comp env jdbc DatabaseName   gt   lt  bean gt    You can declare the JNDI resource in tomcat s server xml using something like this    lt GlobalNamingResources gt       lt Resource name  jdbc DatabaseName                auth  Container                type  javax sql DataSource                username  dbUser                password  dbPassword                url  jdbc postgresql   localhost dbname                driverClassName  org postgresql Driver                initialSize  20                maxWaitMillis  15000                maxTotal  75                maxIdle  20                maxAge  7200000                testOnBorrow  true                validationQuery  select 1                  gt   lt  GlobalNamingResources gt    And reference the JNDI resource from Tomcat s web context xml like this      lt ResourceLink name  jdbc DatabaseName     global  jdbc DatabaseName     type  javax sql DataSource   gt    Reference documentation    Tomcat 8 JNDI Datasource HOW-TO Tomcat 8 Context Resource Links Reference Spring 4 JEE JNDI Lookup XML Schema Reference Spring 4 JndiObjectFactoryBean Javadoc   Edit  This answer has been updated for Tomcat 8 and Spring 4   There have been a few property name changes for Tomcat s default datasource resource pool setup

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With Spring s JavaConfig mechanism  you can do it like so    Configuration public class MainConfig                  Bean     DataSource dataSource             DataSource dataSource   null          JndiTemplate jndi   new JndiTemplate            try               dataSource   jndi lookup  java comp env jdbc yourname   DataSource class             catch  NamingException e                logger error  NamingException for java comp env jdbc yourname   e                     return dataSource

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According to  Apache Tomcat 7 JNDI Datasource HOW-TO page there must be a resource configuration in web xml   lt resource-ref gt     lt description gt DB Connection lt  description gt     lt res-ref-name gt jdbc TestDB lt  res-ref-name gt     lt res-type gt javax sql DataSource lt  res-type gt     lt res-auth gt Container lt  res-auth gt      That works for me

[java] How to use JNDI DataSource provided by Tomcat in Spring?

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