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Id
8744363
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2012-01-05T14:44:44.353
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2017-07-24T13:55:34.367
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2017-07-24T13:55:34.367
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363573
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JPA doesn't offer this feature yet. Here are three options you can check out : <ul> <li><a href="https://stackoverflow.com/q/2838634/363573">Programmatically loading Entity classes with JPA 2.0?</a> This question on SO is similar to yours. An answer reports that it feasible with Spring. </li> <li><a href="https://stackoverflow.com/q/6380728/363573">JPA 2.0: Adding entity classes to PersistenceUnit *from different jar* automatically</a> Good pointers are given here. </li> <li>Last but not least, a simple work around : 1. Generate a <code>persistence.xml</code> on the fly (simple XML file creation) with a new persistence unit. 2. Add persistence file to classpath dynamically (<code>URLCLassLoader</code>) 3. Ask <code>PersistenceProvider</code> to load new persistence unit (<code>createEntityManagerFactory</code>)</li> </ul> EDIT: If the JPA provider is Hibernate, since Hibernate 4.0, it's possible to pass directly entities to this JPA provider without declaring them in the <code>persistence.xml</code> file. Hibernate will handle the entities on the fly. EDIT: Here is a sample configuration of JPA 2.1 + Hibernate 4.3.7.Final without declaring any entities : META-INF/persistence.xml <pre><code><?xml version="1.0" encoding="UTF-8" ?> <persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1"> <persistence-unit name="my-persistence-unit" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> <properties>  <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/my-database" /> <property name="javax.persistence.jdbc.user" value="login" /> <property name="javax.persistence.jdbc.password" value="password" />  <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" /> <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" /> <property name="hibernate.default_schema" value="public" /> <property name="hibernate.hbm2ddl.auto" value="update" /> <property name="hibernate.show_sql" value="false" /> <property name="hibernate.format_sql" value="true" />  <property name="hibernate.c3p0.min_size" value="5" /> <property name="hibernate.c3p0.max_size" value="20" /> <property name="hibernate.c3p0.timeout" value="500" /> <property name="hibernate.c3p0.max_statements" value="50" /> <property name="hibernate.c3p0.idle_test_period" value="2000" /> </properties> </persistence-unit> </persistence> </code></pre> References <ul> <li><a href="http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-eval-spec/index.html" rel="nofollow noreferrer">JPA 2.1 Specs : 8.2 Persistence Unit Packaging</a></li> <li><a href="http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-eval-spec/index.html" rel="nofollow noreferrer">JPA 2.1 Specs : 8.2.1.6 mapping-file, jar-file, class, exclude-unlisted-classes</a></li> </ul>
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