You should use exactly the same ObjectDB JAR.
The only difference is the database connection url.
If specified in the persistence.xml a client-server url could be specified as follows:
<?xml version="1.0" encoding="UTF-8" ?>
<persistence 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" version="1.0">
<persistence-unit name="my-pu">
<description>My Persistence Unit</description>
<provider>com.objectdb.jpa.Provider</provider>
<properties>
<property name="javax.persistence.jdbc.url"
value="objectdb://localhost/my.odb"/>
<property name="javax.persistence.jdbc.user" value="admin"/>
<property name="javax.persistence.jdbc.password" value="admin"/>
</properties>
</persistence-unit>
</persistence>
ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)