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I'm using Derby in memory for testing and my configuration is very close to yours. Here is my <code>persistence.xml</code>: <pre><code><?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_2_0.xsd" version="2.0"> <persistence-unit name="TestPu" transaction-type="RESOURCE_LOCAL"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <class>com.acme.Foo</class> <class>com.acme.Bar</class> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties>  <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver"/> <property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:test-jpa;create=true"/> <property name="javax.persistence.jdbc.user" value="APP"/> <property name="javax.persistence.jdbc.password" value="APP"/>  <property name="eclipselink.target-database" value="Derby"/> <property name="eclipselink.ddl-generation" value="drop-and-create-tables"/> <property name="eclipselink.debug" value="ALL"/> <property name="eclipselink.weaving" value="static"/> <property name="eclipselink.logging.level" value="FINEST"/> <property name="eclipselink.logging.level.sql" value="FINEST"/> <property name="eclipselink.logging.level.cache" value="FINEST"/> </properties> </persistence-unit> </persistence> </code></pre> Where <code>org.apache.derby:derby:jar:10.6.2.1</code> is on the classpath. Now two questions/suggestions: <ul> <li>How do you know the database is persisted on disk?</li> <li>If it really does, make sure you're using the <code>persistence.xml</code> you think you are.</li> </ul>
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