03 : 09 : 26 , 843  ERROR [MainDeployer] Could not start deployment: file:/C:/usr/local/jboss/server/ default /deploy/mysite.war
org.jboss.deployment.DeploymentException: Error during deploy; - nested throwable: (javax.naming.NamingException: resource-ref: jdbc:/PostgresDS has no valid JNDI binding. Check the jboss-web/resource-ref.)

...
<resource-ref>
	<res-ref-name>jdbc:/PostgresDS</res-ref-name>
	<res-type>javax.sql.DataSource</res-type>
	<res-auth>Container</res-auth>
</resource-ref>
...

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss-web  PUBLIC  "-//JBoss//DTD Web Application 2.2//EN" 
	"http://www.jboss.org/j2ee/dtd/jboss-web.dtd">
<jboss-web>
	<res-ref-name>jdbc:/PostgresDS</res-ref-name>
	<jndi-name>java:/PostgresDS</jndi-name>
</jboss-web>

<datasources>

  <local-tx-datasource>
    <jndi-name>PostgresDS</jndi-name>
    <connection-url>jdbc:postgresql://localhost:5432/jboss</connection-url>
    <driver- class >org.postgresql.Driver</driver- class >
    <user-name>root</user-name>
    <password> 123456 </password>    
    <min-pool-size> 5 </min-pool-size>
    <max-pool-size> 100 </max-pool-size>    

        <metadata>
         <type-mapping>PostgreSQL  7 . 2 </type-mapping>
      </metadata>  
    </local-tx-datasource>

</datasources>