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Unable to understand pooling error using JPA, Tomcat, Oracle

I have the following code in context.xmlfor Tomcat:

<Resource name="ds/OracleDS" auth="Container" type="javax.sql.DataSource"
maxActive="1" maxIdle="2" maxWait="2"
username="demo" password="demo"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@localhost:1521:orcl"/>

I have this code in web.xml:

<resource-ref>
 <description>Oracle Datasource example</description>
 <res-ref-name>ds/OracleDS</res-ref-name>
 <res-type>javax.sql.DataSource</res-type>
 <res-auth>Container</res-auth>
</resource-ref>

I wrote code in persistence.xmllike:

<persistence-unit name="ReceivablesPU"  transaction-type="RESOURCE_LOCAL">
        <provider>oracle.toplink.essentials.PersistenceProvider</provider>
        <non-jta-data-source>java:ds/OracleDS</non-jta-data-source>

I do not understand java:ds/OracleDS, <Resource name="ds/OracleDS", <res-ref-name>ds/OracleDS</res-ref-name>. Error:

javax.persistence.PersistenceException: Exception [TOPLINK-7060] (Oracle TopLink Essentials - 2.0 (Build b40-rc (03/21/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:ds/OracleDS].
Internal Exception: javax.naming.NamingException: This context must be accessed through a java: URL
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3 answers

i changes in contex.xml:

<Resource name="OracleDS" auth="Container" type="javax.sql.DataSource"
    maxActive="1" maxIdle="2" maxWait="2"
    username="demo" password="demo"
    driverClassName="oracle.jdbc.driver.OracleDriver"
    url="jdbc:oracle:thin:@localhost:1521:orcl"/>

i changes in web.xml:

<resource-ref>
     <description>Oracle Datasource example</description>
     <res-ref-name>OracleDS</res-ref-name>
     <res-type>javax.sql.DataSource</res-type>
     <res-auth>Container</res-auth>
    </resource-ref>

i changes to persistence.xml

<persistence-unit name="ReceivablesPU"  transaction-type="RESOURCE_LOCAL">
        <provider>oracle.toplink.essentials.PersistenceProvider</provider>
        <non-jta-data-source>java:comp/env/OracleDS</non-jta-data-source>

then I got the result ....

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In persistence.xmlyour third line should look like this:

        <non-jta-data-source>java:comp/env/ds/OracleDS</non-jta-data-source>
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, . ( ):

Jetty, Hibernate, datasource

Java EE Web App "ds/OracleDS" JNDI "java: comp/env" (, persistence.xml) .

In your specific Tomcat case, I would try the following:

<Resource name="ds/OracleDS" auth="Container" type="javax.sql.DataSource"
maxActive="1" maxIdle="2" maxWait="2"
username="demo" password="demo"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@localhost:1521:orcl"/>

You do not need anything in your web.xml. The above configuration in .xml context will force Tomcat to provide the data source as a JNDI resource

Finally, in persistence.xml put:

<persistence-unit name="ReceivablesPU"  transaction-type="RESOURCE_LOCAL">
        <provider>oracle.toplink.essentials.PersistenceProvider</provider>
        <non-jta-data-source>java:comp/env/ds/OracleDS</non-jta-data-source>
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