java - javax.naming.NameNotFoundException: Name is not bound in this Context. Unable to find

Question

I'm trying to find out why my web application throws a

javax.naming.NameNotFoundException: Name [flexeraDS] is not bound in this Context. Unable to find [flexeraDS].

when a sister one from which I'm copying the configuration quietly runs.

I have:

1. create from netbeans a new persistence by right clicking and selecting "new persistence", I don't care about the actual values I give but I just need for the persistence.xml file to be created in the right directory.
2. edited my context.xml as below matching the one from working sister project
3. edited my web.xml to contain a resource DataSource as shown below
4. edited my persistence.xml as below again matching the same values which on the sister project work.
5. added all libraries present in the other project inside the lib folder of mine and adding them also from NetBeans to be correctly put inside war.

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/PetLogin">
  <ResourceLink global="ds/flexeraDS" name="ds/flexeraDS" type="javax.sql.DataSource"/>
</Context>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app ....>
<resource-ref>
        <description>DB Connection</description>
        <res-ref-name>ds/flexeraDS</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
</web-app>

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
             xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd ">
    <persistence-unit name="flexerajpa">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <non-jta-data-source>java:/comp/env/ds/flexeraDS</non-jta-data-source>
        <properties>

            <property name="eclipselink.ddl-generation" value="create-tables" />
            <property name="eclipselink.ddl-generation.output-mode"
                      value="database" />
            <property name="eclipselink.weaving" value="static" />
            <property name="eclipselink.logging.level" value="WARNING" />
        </properties>
    </persistence-unit>
</persistence>

Now my syster project some-how manages to create its database folder inside apache-tomcat-7.0.40/bin/exampleDB on startup while mine doesn't create it and throws an error as above.

The code where the error is thrown is the first time I connect to the database:

EntityManager entityManager = PersistenceProvider.createEntityManager();

where the PersistenceProvider class is:

public final class PersistenceProvider
{

    private static Map<String, Object> lOptions = new HashMap<String, Object>();

    static
    {
        lOptions.put(PersistenceUnitProperties.CACHE_SHARED_DEFAULT, "false");
    }
    private static EntityManagerFactory factory = Persistence
            .createEntityManagerFactory("flexerajpa", lOptions);

    private PersistenceProvider()
    {
    }

    /**
     * @return
     */
    public static EntityManager createEntityManager()
    {
        return factory.createEntityManager();
    }

    /**
     * @return
     */
    public static Metamodel getMetamodel()
    {
        return factory.getMetamodel();
    }
}

I'm out of possible reasons for this.. if anyone has any suggestion. Thank you

Answer 1

Ok found out the Tomcat file server.xml must be configured as well for the data source to work. So just add:

<Resource 
auth="Container" 
driverClassName="org.apache.derby.jdbc.EmbeddedDriver" 
maxActive="20" 
maxIdle="10" 
maxWait="-1" 
name="ds/flexeraDS" 
type="javax.sql.DataSource" 
url="jdbc:derby:flexeraDB;create=true" 
  />