I am using jdo and configuring the persistence manager with jdoconfig.xml
However everywhere I find documentation about jdoconfig.xml it states that http://java.sun.
Just replace
xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">
with
xsi:schemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig http://java.sun.com/xml/ns/jdo/jdoconfig_3_0.xsd"