How can I replace jndi search for data source without application server

Question

I want to check out some of the new features that are part of the internal web application. This new code uses a database connection, usually provided by the application server (tomcat).

I do not want to recreate the entire web application on my local computer in order to test the new code, since I only need to run one function.

Does anyone know how I can “spoof” a Context or data source to get the database configuration without actually creating an instance of the web application on the server?

Answer 1

Using Spring SimpleNamingContextBuilder and Apache BasicDataSource , you can do something like this (usually I have this in a static block in test classes that need JNDI):

BasicDataSource dataSource = new BasicDataSource(); dataSource.setDriverClassName(db_driver_name); dataSource.setUrl(db_connection_url); dataSource.setUsername(db_username); dataSource.setPassword(db_password); SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder(); builder.bind(jndi_name, dataSource); builder.activate(); 

The jndi_name value might look like this: java:comp/env/jdbc/my-db

Once this is set up, code that normally looks for a database connection through JNDI should work. The above code, for example, will work with this Spring config:

 <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="java:comp/env/jdbc/my-db"/> </bean> 

Answer 2

The solutions listed here look a little simpler than what I came up with about a year ago when I had to do the same. Basically, I made my very simple DataSource implementation and added it to a new initial context.

http://penguindreams.org/blog/running-beans-that-use-application-server-datasources-locally/

Answer 3

With TomcatJNDI, you can access every JNDI resource configured in Tomcat, as it was in your web application. The code to achieve it is simple and looks like

 TomcatJNDI tomcatJNDI = new TomcatJNDI(); tomcatJNDI.processContextXml(contextXmlFile); tomcatJNDI.start(); DataSource ds = (DataSource) InitialContext.doLookup("java:comp/env/path/to/datasource") 

Go here to learn more about this.