org.apache.openjpa.util.MetaDataException: MetaDataFactory could not
be configured (conf.newMetaDataFactoryInstance() returned null). This
might mean that no configuration properties were found. Ensure that
you have a META-INF/persistence.xml file, that it is available in your
classpath, or that the properties file you are using for configuration
is available. If you are using Ant, please see the <properties> or
<propertiesFile> attributes of the task's nested <config> element.
This can also occur if your OpenJPA distribution jars are corrupt, or
if your security policy is overly strict.